Developer & Testing APIs
Free APIs for developers: request testing and echo endpoints, mock REST data for prototypes, package registry lookups, QR codes and public holiday data. All tested.
86 tested APIs with full docs · 86 need no key · 348 more listed
Tested, with full documentation
We called each of these before publishing. Every page carries a working curl command, the real JSON response it returned, parameters and common errors.
24 Pull Requests
Free JSON API listing open source projects and contributors from the 24 Pull Requests campaign. No key required. Working curl example and response breakdown.
Abacus
A free, key-free counter API for page hits, downloads and votes. Read a counter without incrementing it, or increment atomically. CountAPI's live replacement.
Anaconda.org
Look up conda packages on Anaconda.org including every version, owner and summary, with no API key. Covers conda-forge and Bioconda. Verified example included.
APIs.guru
APIs.guru is a free, key-free directory of machine-readable OpenAPI definitions for thousands of public APIs. List providers, fetch specs, tested curl example included.
Arch User Repository (AUR)
Free Arch User Repository RPC API with no key: search AUR packages, get versions, dependencies, maintainers, votes and popularity scores. Tested example.
Artifact Hub
Search Helm charts, operators, Falco rules and other CNCF artefacts as JSON with no key. Includes security-scan summaries per package. Verified live example.
Badgen
Free badge API with no key: build shields-style SVG badges from a URL path. Static badges, live data badges and custom colours. Tested example and live response.
Bitbucket REST API
Read public Bitbucket repositories, commits and pull requests as JSON without authenticating. 60 anonymous requests per hour, exposed in response headers.
Bored API
Free API that suggests a random activity when you're bored. Filter by type, participants, price and accessibility. No key required. Tested curl example.
Bundlephobia
Free Bundlephobia API with no key: minified and gzipped size of any npm package, plus dependency count, tree-shakeability and download time estimates. Tested.
cdnjs
Free cdnjs API with no key: search 4,000+ front-end libraries, get versions, file listings and SRI hashes for secure script tags. Tested curl example.
Cloudflare Trace
Free Cloudflare trace endpoint with no key: your IP, country, data centre, TLS version, HTTP protocol and user agent as plain text. Instant, no signup. Tested.
CocoaPods Trunk
Query the CocoaPods Trunk API for a pod's published versions and release timestamps with no key. Includes the non-ISO date format and version-ordering gotchas.
Codeberg (Forgejo)
Free Codeberg API with no key for public data: repository search, issues, releases and users on the non-profit Git host. Same API as Gitea and Forgejo. Tested.
CRAN DB
Read any CRAN package's DESCRIPTION file as JSON: version, licence, dependencies, maintainer and full history. No key required. Verified example and field notes.
crates.io
Free crates.io API with no key: Rust crate metadata, versions, download counts, dependencies and repository links. CORS enabled. Tested curl example.
CTAN
Read LaTeX package metadata from CTAN as JSON: authors, licence, version, documentation links and descriptions. No API key. Verified example and parsing notes.
Debian Sources
Search Debian source packages and browse their file trees as JSON, with no key. Covers every suite from oldstable to sid. Verified example and endpoint map.
deps.dev
Free Google deps.dev API with no key: transitive dependency graphs, licences, advisories and OpenSSF scorecards across npm, PyPI, Go, Maven and Cargo. Tested.
DigitalOcean Status
Read DigitalOcean's live component health, incidents and maintenance windows as JSON. No key. The same Statuspage v2 schema works for hundreds of other vendors.
Docker Hub
Free Docker Hub API with no key for public images: repository metadata, pull counts, stars, tags and last-updated dates. Tested curl example and live JSON.
Drupal.org API
Query Drupal.org for modules, themes, issues and users as JSON. No API key, no signup. Live curl example plus the pagination gotchas that catch people out.
DummyJSON
Free fake REST API with realistic products, users, carts, recipes and auth. Supports search, pagination, sorting and POST. No key. Tested GET and POST examples.
EC2.shop
Get on-demand, spot and reserved EC2 prices as JSON with a single URL and no AWS credentials. Filter by instance type or region. Live captured response included.
Zuplo Echo
Free HTTP echo API with no key: reflects your request method, headers, query and body back as JSON. Ideal for debugging clients. Tested curl example.
Ecosyste.ms
Free Ecosyste.ms API with no key: package metadata, dependencies, repository data and usage statistics across 60+ package registries. Tested curl example.
endoflife.date
Free end-of-life API with no key: support and security-EOL dates for 300+ products — Node, Python, Ubuntu, Django, PHP and more. Tested curl example.
Fake Store API
Free fake e-commerce API with products, categories, carts and users. Built for building shop prototypes and React tutorials. No key. Tested curl example.
Flathub
Fetch Linux desktop app metadata, screenshots and release notes from Flathub as JSON with no API key. Verified example plus the epoch-as-string gotcha.
Fontsource
Query font metadata including weights, styles, subsets, unicode ranges and licences for Google Fonts and more. No API key, unlike the official Google Fonts API.
GitHub Contributions Chart
Fetch any public GitHub user's contribution graph as JSON: per-day counts, colours and yearly totals. No token needed. Live example and the CORS caveat.
GitHub REST API
GitHub REST API with no key for public data: repository details, users, issues, releases and commits. 60 req/hour unauthenticated, 5,000 with a token.
GitHub Status
Check whether GitHub is down from code. One small JSON request returns the overall indicator and description, with no token and no rate limit to worry about.
gitignore.io
Build a .gitignore from any combination of languages, editors and operating systems with one GET request. No key. Verified example and the CORS caveat.
GitLab
Free GitLab API with no key for public projects: repositories, issues, merge requests, pipelines and releases. Works on gitlab.com and self-hosted. Tested.
Go Module Proxy
Free Go module proxy API with no key: list versions of any public Go module, get commit info and checksums straight from proxy.golang.org. Tested example.
Google Favicon Service
Free favicon API with no key: pass a domain and get back that site's favicon as a PNG at any size. Handles missing icons with a fallback. Tested example included.
Hex.pm
Free Hex.pm API with no key: Elixir and Erlang package metadata, releases, download counts, dependencies and documentation links. Tested curl example.
Hipsum
Generate hipster-flavoured placeholder text over HTTP with no API key. Choose sentences, paragraphs or words, in Latin-mixed or English-only mode. Tested example.
Homebrew Formulae
Free Homebrew formulae API with no key: package versions, dependencies, install counts, licences and caveats for every macOS and Linux formula. Tested.
httpbingo
Free HTTP request testing API with no key: a Go reimplementation of httpbin with HTTP/2, streaming, status codes, auth and redirect endpoints. Tested.
Image-Charts
Generate bar, line and pie chart images from a URL, Google Image Charts style, with no API key. Perfect for emails and READMEs where JavaScript cannot run.
IPinfo
Look up city, region, country, coordinates and ASN for any IP address. The /json endpoint works with no token. Real captured response and the field traps explained.
IPLocate
Free IP geolocation API with no key: country, city, coordinates, ASN, plus VPN, proxy, Tor and hosting detection. 1,000 free lookups a day. Tested example included.
ItsThisForThat
Free API that returns a random 'it is X for Y' startup pitch as JSON. No key needed. Includes the content-type gotcha and a real captured response.
jsDelivr
Free jsDelivr data API with no key: npm and GitHub package versions, file listings, dist-tags and CDN usage statistics. CORS enabled. Tested curl example.
JSON Schema Store
Fetch the catalogue that maps config filenames to JSON Schemas, the same one VS Code and JetBrains IDEs use. No key. Verified example and integration notes.
JSONPlaceholder
Free fake REST API for testing and prototyping. Posts, comments, users and todos with full GET, POST, PUT and DELETE support. No key. Real curl examples.
Kroki
Free diagram-as-code API with no key: send Graphviz, Mermaid, PlantUML or 25 other diagram languages as text and get back SVG, PNG or PDF. Tested curl example included.
Maven Central Search
Search Maven Central for Java artifacts, latest versions and coordinates with no API key. Solr-backed query syntax, tested example and the epoch-milliseconds trap.
Mermaid.ink
Turn Mermaid diagram source into a PNG, JPEG, SVG or PDF with a single URL. No key, no JavaScript, works in READMEs and email. Verified example included.
NetworkCalc
Calculate subnet masks, network and broadcast addresses and host ranges over HTTP, plus DNS lookups, with no API key. Verified example and full field breakdown.
npm Download Counts
Free npm download counts API with no key: weekly, monthly and ranged download statistics for any package, plus per-day breakdowns. Tested curl example.
npm Registry API
Free npm registry API with no key: package metadata, all versions, dependencies, maintainers and dist-tags for any public package. Tested curl example.
NuGet
Free NuGet API with no key: search .NET packages, get versions, download counts, descriptions and authors from the official registry. Tested curl example.
Open VSX Registry
Search and read VS Code extension metadata from the vendor-neutral Open VSX registry as JSON. No key, generous rate limit, real download counts and ratings.
OSV (Open Source Vulnerabilities)
Free Google OSV API with no key: query any package version against a unified vulnerability database spanning npm, PyPI, Go, Maven, crates.io and more. Tested.
Packagist
Free Packagist API with no key: PHP package metadata, all versions, dependencies, licences and autoload config from the Composer registry. Tested example.
PeeringDB
Read the internet's peering database as JSON: networks, exchanges, facilities and peering policies. Anonymous access works, with limits. Verified live example.
Piston
List every language and version Piston can run, then execute code in a sandbox over HTTP. No API key. Verified runtimes response and the rate limit that bites.
PlantUML Server
Free PlantUML server API with no key: render sequence, class, activity and component diagrams to SVG or PNG from an encoded URL. Tested example and live response.
Postman Echo
Postman Echo reflects your HTTP request back as JSON: headers, body, query params and auth. Free, no key, ideal for debugging clients. Real POST example.
pub.dev
Fetch any Dart or Flutter package's versions, pubspec, archive URL and SHA-256 from pub.dev as JSON. No key required. Live example plus the version-ordering trap.
Nager.Date Public Holidays
Free public holiday API with no key. Get official holidays for 100+ countries and any year, including regional variations. Tested curl example and live JSON.
PyPI JSON API
Free PyPI JSON API with no key: Python package metadata, versions, dependencies, licence and download URLs. Tested curl example and live response.
QR Server (goQR.me)
Free QR code generator API with no key. Create QR codes as PNG, SVG or EPS at any size and colour using a single URL. Tested example and full parameter list.
Quay.io
Browse public container image repositories on Quay.io as JSON with no token. Filter by namespace, read descriptions and states. Verified example and paging notes.
QuickChart
Free chart image API with no key: pass a Chart.js config in the URL and get back a PNG or SVG chart. Works in emails, PDFs and READMEs. Tested example included.
Repology
Free Repology API with no key: which version of any package each Linux distribution ships, across 300+ repositories. Ideal for packaging work. Tested.
restful-api.dev
Free fake REST API with real GET, POST, PUT, PATCH and DELETE support and no key. Ideal for tutorials, HTTP client demos and integration tests. Live example included.
RIPEstat
Query internet routing data from RIPE NCC: announcing ASNs, prefixes, whois, abuse contacts and routing history. No key. Verified example and envelope guide.
RubyGems
Free RubyGems API with no key: gem metadata, versions, download counts, dependencies, licence and source URLs. CORS enabled. Tested curl example.
Shields.io
Free badge API with no key: generate SVG status badges for READMEs from a URL, with custom labels, colours, logos and live data from 100+ services. Tested.
Simple Icons CDN
Fetch any brand's official SVG logo by slug, already coloured, with one GET request. No key, no npm install, permissive CORS. Verified example and sizing notes.
Snapcraft Store
Query the Snap Store for a package's channels, architectures, revisions and download URLs. No key, but one required header catches everyone out. Live example.
Stack Exchange
Free Stack Exchange API with no key: questions, answers, users, tags and search across Stack Overflow and 170+ sites. Tested curl example and live JSON.
Swagger Validator
Free Swagger/OpenAPI validator API with no key: check any OpenAPI or Swagger specification for schema errors by URL. Returns structured messages. Tested.
Terraform Registry
Query the public Terraform Registry for modules and providers, with versions, download counts and source repositories. No API key. Verified example included.
unpkg
Free unpkg CDN with no key: fetch any file from any npm package by URL, including package.json, with version ranges and directory listings. Tested example.
UUID Tools API
Free UUID generator API with no key. Generate v1, v3, v4 and v5 UUIDs in bulk over HTTP. Tested curl example, live response and guidance on when to use it.
Vector Express
Convert between SVG, DXF, DWG, EPS, PDF, AI, CDR, HPGL and more over HTTP with no key. Query the converter matrix first to find a valid conversion path.
W3C API
Query W3C for specifications, working groups, editors and publication history as HAL+JSON. No API key. Verified example plus a guide to following HAL links.
W3C CSS Validator
Validate a stylesheet or a whole page's CSS against any CSS profile and get structured JSON errors and warnings. No API key required. Verified live example.
W3C Nu HTML Checker
Run the official W3C HTML validator from code and get machine-readable JSON errors with line and column numbers. No key required. Live verified example.
Wandbox
Query Wandbox for every compiler it hosts, with versions and switch definitions, then compile code over HTTP. No API key. Verified response and field guide.
What The Commit
Fetch a random, painfully relatable git commit message as plain text with one curl. No key, no JSON parsing, no dependencies. Verified example response included.
Choosing between these Developer & Testing APIs
These are the APIs you reach for while building something else — mock endpoints that accept POST requests so you can test a form, echo services that show you exactly what your client sent, and registries that expose package metadata as JSON.
This category contains the directory's working POST examples. If you are learning how to send a JSON body with curl, fetch or Axios, the JSONPlaceholder, DummyJSON and Postman Echo pages each show a real request and the real response it produced.
More Developer & Testing APIs in the directory
348 further APIs in this category, of which 122 need no API key. These are catalogued from the public-API lists and link straight to each provider's own documentation — we have not tested them yet, so treat the auth and CORS flags as the upstream list's claim rather than ours. They are promoted to a full tested page as we work through them.
| API | What it does | Auth |
|---|---|---|
| Abstract Screenshot | Take programmatic screenshots of web pages from any website | KeyCORS |
| AddressMock | Random US, Hong Kong and Cape Verde addresses with matched city, state and ZIP | NoneCORS |
| Agent Gateway | 34+ AI agent infrastructure services including memory, wallets, and scheduling | KeyCORS |
| AgentDeals | Search and compare developer free tiers, startup credits, and pricing changes | NoneCORS |
| Agify.io | Estimates the age from a first name | NoneCORS |
| AI Meeting Minutes Suite | Generate summaries, templates, and redact sensitive data from meeting notes | KeyCORS |
| Airtable | Integrate with Airtable | Key |
| Amazonscraperapi | Amazon product, search & batch scraping API with residential proxies (1000 free) | Key |
| AmberOne | Turn any website into a build-ready Android, iOS, PWA or Electron app project | Key |
| API Grátis | Multiples services and public APIs | None |
| API League | World-class APIs in a single hub | KeyCORS |
| API Status Check | Real-time status and uptime monitoring for 270+ APIs and services | NoneCORS |
| Api2Convert | Online File Conversion API | Key |
| ApicAgent | Extract device details from user-agent string | NoneCORS |
| ApiFlash | Chrome based screenshot API for developers | Key |
| APILayer | APILayer is a unified API marketplace with 40+ production-ready APIs for finance, geolocation, weather, data, and AI. Trusted by 2.2M+ developers | None |
| apilayer pdflayer | HTML/URL to PDF | Key |
| ApyHub: A Complete API Catalog | Build and ship applications that scale using certified APIs for every use case | KeyCORS |
| Asana | Programmatic access to all data in your asana system | KeyCORS |
| ASORadar | App Store and Google Play reviews, ratings, rankings and app metadata | Key |
| AutoChangelog | Automatically creates changelog entries from deployments by analyzing pull requests, commits, and code diffs across your GitHub repositories | KeyCORS |
| Autom | Our SERP API delivers lightning-fast Google search results at unbeatable prices. Built for developers who need reliable, scalable access to search data without the complexity of web scraping or CAPTCHA challenges. | KeyCORS |
| Azure DevOps | The Azure DevOps basic components of a REST API request/response pair | Key |
| Azure DevOps Health | Resource health helps you diagnose and get support when an Azure issue impacts your resources | Key |
| Bacon Ipsum | A Meatier Lorem Ipsum Generator | None |
| Base | Building quick backends | KeyCORS |
| Beeceptor | Build a mock Rest API endpoint in seconds | NoneCORS |
| Bitbucket | Bitbucket API | OAuth |
| Bitrise | Build tool and processes integrations to create efficient development pipelines | Key |
| Blague.xyz | La plus grande API de Blagues FR/The biggest FR jokes API | KeyCORS |
| Blitapp | Schedule screenshots of web pages and sync them to your cloud | Key |
| Blynk-Cloud | Control IoT Devices from Blynk IoT Cloud | Key |
| Bored | Find random activities to fight boredom | None |
| Box | File Sharing and Storage | OAuth |
| Brainshop.ai | Make A Free A.I Brain | KeyCORS |
| Brand.dev | API to personalize your product with logos, colors, and company info from any domain | KeyCORS |
| Brave Search API | An index of billions of pages in a single call | Key |
| BrewPage | Free hosting for HTML, JSON, key-value, files, multi-file sites with short URLs and TTL retention | None |
| BrowserCat | Headless browser API for automation, scraping, and more | KeyCORS |
| Browshot | Easily make screenshots of web pages in any screen size, as any device | KeyCORS |
| Buddy | The fastest continuous integration and continuous delivery platform | OAuth |
| BuildPDF | Convert HTML, images, and text to PDF | KeyCORS |
| Changelogs.md | Structured changelog metadata from open source projects | None |
| Ciprand | Secure random string generator | None |
| CircleCI | Automate the software development process using continuous integration and continuous delivery | Key |
| Citability | AI visibility scoring for domains: ADP, llms.txt, Schema.org, MCP endpoints | NoneCORS |
| ClickUp | ClickUp is a robust, cloud-based project management tool for boosting productivity | OAuth |
| Clipform | Create and manage interactive video-style forms, quizzes, and surveys | Key |
| Clockify | Clockify's REST-based API can be used to push/pull data to/from it & integrate it with other systems | Key |
| CloudConvert | Online file converter for audio, video, document, ebook, archive, image, spreadsheet, presentation | Key |
| Cloudflare | Manage DNS, CDN, Workers and other services; documented with an official OpenAPI 3.0 spec | Key |
| Cloudmersive Document and Data Conversion | HTML/URL to PDF/PNG, Office documents to PDF, image conversion | KeyCORS |
| Code::Stats | Automatic time tracking for programmers | Key |
| Codeforces | Get access to Codeforces data | Key |
| Codeship | Codeship is a Continuous Integration Platform in the cloud | Key |
| Codex | Online Compiler for Various Languages | None |
| Codex Reset | OpenAI Codex usage-limit reset history, verified announcements and 24h/48h reset probability | NoneCORS |
| Contentful Images | Used to retrieve and apply transformations to images | KeyCORS |
| Convert HTML to PDF API | This API converts any HTML (file, url, base64) to a PDF | KeyCORS |
| Convert RSS to JSON | Transform raw RSS data into structured JSON | KeyCORS |
| Convert Speech to Text API | This API converts any speech to text multiple languages and dialects | KeyCORS |
| Convert Word to PDF | Convert a Word document (doc, docx, or ODF formats) to a PDF document | KeyCORS |
| ConvertHub API | File Conversion API for Developers - Powerful REST API for file conversion. Convert documents, images, ebooks, and more. Simple integration, dev-friendly pricing. | Key |
| CoreClaw | Real-time public data, ready to use. Extract web data from Amazon, TikTok, Google Maps and more with 100+ ready-made tools | Key |
| CORS Proxy | Get around the dreaded CORS error by using this proxy as a middle man | NoneCORS |
| Corsfix | Corsfix lets you fetch any resource and bypass CORS errors, free for development environment | NoneCORS |
| CountAPI | Free and simple counting service. You can use it to track page hits and specific events | NoneCORS |
| Countly | Countly web analytics | None |
| CraftMyPDF | Generate PDF documents from templates with a drop-and-drop editor and a simple API | Key |
| Creative Commons Catalog | Search among openly licensed and public domain works | OAuthCORS |
| CSV to JSON API | Convert CSV files to JSON with this API. Ideal for developers who want to automate data workflows and integrate structured data | KeyCORS |
| CustomJS | HTML to PDF or PDF to PNG/Text & PDF merging/extraction/merging APIs | Key |
| CV / Resume Parsing API | The Resume Parser API parses a resume (CV) file from multiple formats (PDF/DOC/DOCX/TXT/RTF) and returns an extensive object of data points | KeyCORS |
| Databricks | Service to manage your databricks account,clusters, notebooks, jobs and workspaces | KeyCORS |
| Datamuse | Word-finding query engine | None |
| DATPAQ | Developer-first APIs. Enterprise-ready infrastructure. Sampla data, avatars, image processing and a lot more. | KeyCORS |
| ddownload | File Sharing and Storage | Key |
| Delta Lake | Open-source storage framework enabling Lakehouse architecture with Spark, PrestoDB, Flink, Trino, Hive, and APIs | None |
| Diagrams.so | Generate editable draw.io architecture diagrams from text or infrastructure code | Key |
| Dicebear Avatars | Generate random pixel-art avatars | None |
| DigMyName | Domain availability and registrar pricing across 52 TLDs | NoneCORS |
| DocForge | Convert between Markdown, HTML, CSV, JSON, and YAML formats | NoneCORS |
| DocStruct | AI extraction of invoices, receipts, bank statements & contracts into structured JSON/CSV | NoneCORS |
| DomainDb Info | Domain name search to find all domains containing particular words/phrases/etc | None |
| dotsweep | Domain availability across 1200+ TLDs with registration and renewal prices | NoneCORS |
| DownStatus | Real-time status for GitHub, AWS, Discord and 90+ services | NoneCORS |
| Dropbox | File Sharing and Storage | OAuth |
| Drupal.org | Drupal.org | None |
| EC2.shop API | Get AWS service price right from your terminal | None |
| English Random Words | Generate English Random Words with Pronunciation | None |
| Evil Insult Generator | Evil Insults | NoneCORS |
| ExtendsClass JSON Storage | A simple JSON store API | NoneCORS |
| FakeJSON | Service to generate test and fake data | KeyCORS |
| Faker | Generate massive amounts of fake (but realistic) data for testing and development. | None |
| FakerAPI | APIs collection to get fake data | NoneCORS |
| FastApi Simple Calculator | Math, Stadistics, Conversions, Currency and more | None |
| File Conversions API | APIs to handle all your file transformations. Word to PDF, Markdown to HTML, CSV to JSON, audio and many more | KeyCORS |
| File.io | Super simple file sharing, convenient, anonymous and secure | None |
| Filestack | Filestack File Uploader & File Upload API | Key |
| FileUp | Temporary file hosting with upload API, expiration times, and view limits | None |
| Flowdash | Automate business workflows | Key |
| Form Creation API | Create and manage customizable forms within your applications | KeyCORS |
| Format JSON Online Dummy API | A free tool to generate dummy JSON data for testing and prototyping. | NoneCORS |
| FormForge | Generate styled, accessible HTML forms from JSON definitions with validation | NoneCORS |
| fynk | Generate, update, and manage contracts from your own systems with a secure and scalable REST API | KeyCORS |
| Gcore CDN | Make your app fast and responsive for a global audience with Gcore CDN. | KeyCORS |
| Gcore Cloud | Scalable, secure, and reliable hybrid cloud services anywhere in the world. | KeyCORS |
| Gcore DNS | Fast and resilient DNS hosting service by Gcore. Improve the performance and availability of your online business. | KeyCORS |
| Gcore Storage | S3-Compatible Object Storage is a fast and scalable cloud storage system by Gcore that gives you an opportunity to store and retrieve any amount of data at any time. High-performance storage for use as a CDN origin. | KeyCORS |
| GeekFlare | Provide numerous capabilities for important testing and monitoring methods for websites | Key |
| Genderize.io | Estimates a gender from a first name | NoneCORS |
| GeneradorDNI | Data generator API. Profiles, vehicles, banks and cards, etc | Key |
| Generate Full Webpage Screenshot | Dynamically capture full page screenshots of websites. | KeyCORS |
| GETPing | Trigger an email notification with a simple GET request | Key |
| Ghost | Get Published content into your Website, App or other embedded media | KeyCORS |
| GitHub | Make use of GitHub repositories, code and user info programmatically | OAuthCORS |
| GitHub Contribution Chart Generator | Create an image of your GitHub contributions | NoneCORS |
| GitHub ReadMe Stats | Add dynamically generated statistics to your GitHub profile ReadMe | NoneCORS |
| Gitter | Chat for Developers | OAuth |
| Glitterly | Image generation API | KeyCORS |
| GoFile | Unlimited size file uploads for free | Key |
| Google Docs | API to read, write, and format Google Docs documents | OAuth |
| Google Drive | File Sharing and Storage | OAuth |
| Google Firebase | Google's mobile application development platform that helps build, improve, and grow app | KeyCORS |
| Google Fonts | Metadata for all families served by Google Fonts | Key |
| Google Keep | API to read, write, and format Google Keep notes | OAuth |
| Google Sheets | API to read, write, and format Google Sheets data | OAuth |
| Google Slides | API to read, write, and format Google Slides presentations | OAuth |
| Gorest | Online REST API for Testing and Prototyping | OAuth |
| Gyazo | Save & Share screen captures instantly | Key |
| Hackerearth | For compiling and running code in several languages | Key |
| Hasura | GraphQL and REST API Engine with built in Authorization | KeyCORS |
| Heroku | REST API to programmatically create apps, provision add-ons and perform other task on Heroku | OAuthCORS |
| Hoppscotch | A lightweight, fast, and customizable app for testing and designing APIs. A free, fast, and beautiful | None |
| host-t.com | Basic DNS query via HTTP GET request | None |
| Host.io | Domains Data API for Developers | KeyCORS |
| Html2PDF | HTML/URL to PDF | Key |
| HTTP2.Pro | Test endpoints for client and server HTTP/2 protocol support | None |
| Httpbin | A Simple HTTP Request & Response Service | NoneCORS |
| Httpbin Cloudflare | A Simple HTTP Request & Response Service with HTTP/3 Support by Cloudflare | NoneCORS |
| HTTPie | a free command-line HTTP client for the API era | None |
| httpSMS | Use your Android phone as an SMS gateway to send and receive SMS messages via a simple HTTP API | KeyCORS |
| Hunter | API for domain search, professional email finder, author finder and email verifier | Key |
| IBM Text to Speech | Convert text to speech | KeyCORS |
| Icanhazepoch | Get Epoch time | NoneCORS |
| Icanhazip | IP Address API | NoneCORS |
| IFTTT | IFTTT Connect API | None |
| iLovePDF | Convert, merge, split, extract text and add page numbers for PDFs. Free for 250 documents/month | KeyCORS |
| Imgbb | Simple and quick private image sharing | Key |
| import.io | Retrieve structured data from a website or RSS feed | Key |
| Insomnia | A free API client that allows you to design, debug, test, and mock APIs locally, on Git, or cloud. | OAuth |
| Invoice Parsing API | Extract structured invoice data using AI with this API. Multiple formats supported | KeyCORS |
| IP Details API | Geographic location of an IP address or any domain name along with some other useful information | Key |
| ip-fast.com | IP address, country and city | NoneCORS |
| IP2WHOIS Information Lookup | WHOIS domain name lookup | Key |
| ipfind.io | Geographic location of an IP address or any domain name along with some other useful information | KeyCORS |
| IPify | A simple IP Address API | None |
| IPQuery | A free IP Geolocation and proxy/tor/VPN detection API | NoneCORS |
| isitdownstatus | Check if websites and online services are currently down | None |
| JIRA | JIRA is a proprietary issue tracking product that allows bug tracking and agile project management | OAuth |
| JMESPath | Run JMESPath queries on JSON data for filtering, transforming, and extracting results | NoneCORS |
| JSON 2 JSONP | Convert JSON to JSONP (on-the-fly) for easy cross-domain data requests using client-side JavaScript | None |
| JSONbin.io | Free JSON storage service. Ideal for small scale Web apps, Websites and Mobile apps | KeyCORS |
| JSONing | Fake REST API for prototyping | NoneCORS |
| JSONsilo.com | Hassle-free JSON hosting. Convert your JSON file to an API in minutes at no cost. | KeyCORS |
| Judge0 CE | Online code execution system | Key |
| Keyvalue | Simple key-value storage REST API for quick prototyping | None |
| Kiprio PDF Text | Extract plain text from PDF documents for LLM and RAG pipelines | NoneCORS |
| KONTESTS | For upcoming and ongoing competitive coding contests | None |
| License-API | Unofficial REST API for choosealicense.com | None |
| Logs.to | Generate logs | Key |
| Loripsum | The "lorem ipsum" generator that doesn't suck | None |
| Lua Decompiler | Online Lua 5.1 Decompiler | NoneCORS |
| MAC address vendor lookup | Retrieve vendor details and other information regarding a given MAC address or an OUI | KeyCORS |
| Mailsac | Disposable Email | Key |
| Markdown to HTML API | This API lets you upload and transform a Markdown file to HTML | KeyCORS |
| Markdown to JSON API | Upload Markdown and get JSON with one API call | KeyCORS |
| Mattermost | An open source platform for developer collaboration | OAuth |
| MConverter | File converter and PDF compressor. Extract images from video, convert documents, Markdown and more | Key |
| Mercury | Web parser | Key |
| Metabase | An open source Business Intelligence server to share data and analytics inside your company | NoneCORS |
| Metaphorsum | Generate demo paragraphs giving number of words and sentences | None |
| MetaScrape | Extract metadata, Open Graph tags, and structured data from any URL | KeyCORS |
| Micro DB | Simple database service | Key |
| Micro-SaaS AI Suite | 8 serverless AI APIs for sentiment analysis, copy generation, email verification, & OCR | Key |
| MicroENV | Fake Rest API for developers | None |
| Mintlify | For programmatically generating documentation for code | KeyCORS |
| Mockae | Fake REST API powered by Lua | NoneCORS |
| Mockaroo | Generate fake data to JSON, CSV, TXT, SQL and XML | Key |
| Mocky | Mock user defined test JSON for REST API endpoints | NoneCORS |
| Monday | Programmatically access and update data inside a monday.com account | Key |
| Monday | Programmatically access and update data inside a monday.com account | Key |
| MY IP | Get IP address information | None |
| MyIPRightNow | Public IP address with network, location, and connection details | NoneCORS |
| MySQL Visual EXPLAIN | Transform MySQL EXPLAIN output to interactive graphs | NoneCORS |
| Nationalize.io | Estimate the nationality of a first name | NoneCORS |
| Netlify | Netlify is a hosting service for the programmable web | OAuth |
| Notion | Integrate with Notion | OAuth |
| npm Registry | Query information about your favorite Node.js libraries programmatically | None |
| OCR.Space | OCR text extraction from images and PDFs with a free tier | Key |
| Olostep | AI-native web search, scraping, and crawling API that delivers clean, structured, real-time web data. Used by top AI companies | KeyCORS |
| OneDrive | File Sharing and Storage | OAuth |
| OneSignal | Self-serve customer engagement solution for Push Notifications, Email, SMS & In-App | Key |
| Open Page Rank | API for calculating and comparing metrics of different websites using Page Rank algorithm | Key |
| OpenAPIHub | The All-in-one API Platform | Key |
| OpenGraphr | Really simple API to retrieve Open Graph data from an URL | Key |
| OpenQR | Generate QR codes and manage dynamic (editable) QR codes with scan analytics | KeyCORS |
| Orca Scan | Generate barcode images (QR, Code 128, EAN, Data Matrix and more) in SVG, PNG, JPG or PDF | NoneCORS |
| OutageDeck | Live status and incidents for 170+ cloud and SaaS providers from official feeds | NoneCORS |
| oyyi | API for Fake Data, image/video conversion, optimization, pdf optimization and thumbnail generation | NoneCORS |
| PageBolt | Screenshot, PDF, video recording, OG image, and page inspection via REST API | KeyCORS |
| PageCDN | Public API for javascript, css and font libraries on PageCDN | KeyCORS |
| PandaDoc | DocGen and eSignatures API | Key |
| Pantry | Free JSON storage for small projects | NoneCORS |
| PaperClean | Clean document photos for printing, remove shadows and fix lighting | KeyCORS |
| Paraphrase Text API | The Paraphrase Text Generator API generates a paraphrased version of the provided text | KeyCORS |
| Pastebin | Plain Text Storage | Key |
| PayUs-as-a-Service (PUaaS) | A self-hostable API that returns randomized messages for past-due invoices | None |
| Pdfblocks | Generate PDF documents using API | KeyCORS |
| PDFBolt | High-quality HTML to PDF conversion with templates and AI generation | KeyCORS |
| PDFEndpoint | HTML and URL to PDF API | Key |
| PDFFleet | HTML and URL to PDF API with templates and a free tier | KeyCORS |
| PDFGate | HTML to PDF API with support for custom headers, footers, fillable form fields, and encryption | KeyCORS |
| Phone Specs | Real-time smartphone specifications database for 263 devices | NoneCORS |
| PHPhub | PHP syntax checker | None |
| Piloterr | Piloterr web scraping API handles headless browsers, rotates proxies for you, and offers json-parsed data extraction | KeyCORS |
| Pinata | IPFS Pinning Services API | Key |
| PipeDream | Pipedream is the fastest way to build powerful applications that connect all the services in your stack | OAuth |
| Bookmarking service | OAuth | |
| Podio | File sharing and productivity | OAuth |
| PolyDoc | HTML/URL to PDF and screenshots, plus Factur-X/ZUGFeRD e-invoices; free tier | Key |
| Posthook | Schedule webhooks for future delivery with retries and delivery tracking | Key |
| Postman | Tool for testing APIs | Key |
| PrexView | Data from XML or JSON to PDF, HTML or Image | Key |
| Proxed AI | Secure AI APIs in iOS - No SDK, Just Change Your API URL | KeyCORS |
| Proxmox VE API | API of self-hosted Proxmox VE. Address: https://your.server:8006/api2/json/ (configuring in installation process) | Key |
| ProxyCrawl | Scraping and crawling anticaptcha service | Key |
| ProxyForge | Free auto-updating list of live-tested proxies (HTTP/HTTPS/SOCKS4/SOCKS5), refreshed every 6 h | NoneCORS |
| ProxyKingdom | Rotating Proxy API that produces a working proxy on every request | KeyCORS |
| Pusher Beams | Push notifications for Android & iOS | Key |
| Pusher Channels | Realtime features | Key |
| Pythonium | Validate Python code syntax | None |
| QR & Barcode | QR codes and barcodes (Code 128, EAN-13, Data Matrix, PDF417 + more). SVG or PNG output | NoneCORS |
| QR code | Create an easy to read QR code and URL shortener | NoneCORS |
| QR code | Generate and decode / read QR code graphics | None |
| QR Code Crafter | Generate static QR codes in SVG, PNG, JPG, WebP, PDF, or EPS | NoneCORS |
| QR code Generator | Static and Dynamic QR code generator with custom and unique QR code design | Key |
| Qrcode Monkey | Integrate custom and unique looking QR codes into your system or workflow | None |
| QuickMocker | API mocking tool to generate contextual, fake or random data | NoneCORS |
| Quip | File Sharing and Storage for groups | KeyCORS |
| Random Data | Random data generator | None |
| Random Identity | Random Identity Generator with custom response format | KeyCORS |
| Random Profiles | Fake user profiles and companies with 100+ fields each | KeyCORS |
| Random Stuff | Can be used to get AI Response, jokes, memes, and much more at lightning-fast speed | KeyCORS |
| Randommer | Random data generator | KeyCORS |
| RandomUser | Generates and list user data | None |
| Rejax | Reverse AJAX service to notify clients | Key |
| Render API | Lets you programmatically manage your Render services (web apps, APIs, and static sites) including deployments, scaling, and configuration | Key |
| Renderly | HTML to PDF conversion API built on Chromium | KeyCORS |
| RenderPDF.io | HTML to PDF crazy fast, 500 pdfs/month + CDN-ready | KeyCORS |
| Rendex | Render HTML, Markdown, or URLs to PNG/JPEG/WebP/PDF, with extraction and templating | Key |
| ReportForge | Generate styled HTML reports from CSV or JSON data with built-in templates | NoneCORS |
| ReqRes | A hosted REST-API ready to respond to your AJAX requests | None |
| restful-api | Fake REST API for testing and prototyping with CRUD endpoints | None |
| Restpack | Provides screenshot, HTML to PDF and content extraction APIs | Key |
| RoboHash | Generate random robot/alien avatars | None |
| RSS feed to JSON | Returns RSS feed in JSON format using feed URL | NoneCORS |
| RSS to JSON | Returns RSS feed in JSON format using feed URL | NoneCORS |
| RunConvert | Convert video, audio, image, and document files programmatically | Key |
| SavePage.io | A free, RESTful API used to screenshot any desktop, or mobile website | KeyCORS |
| ScrapeNinja | Scraping API with Chrome fingerprint and residential proxies | Key |
| ScraperApi | Easily build scalable web scrapers | Key |
| scraperBox | Undetectable web scraping API | KeyCORS |
| scrapestack | Real-time, Scalable Proxy & Web Scraping REST API | Key |
| Scrapfly | Scrapfly is an enterprise-grade solution providing Web Scraping API that aims to simplify the scraping process by managing everything: real browser rendering, rotating proxies, and fingerprints (TLS, HTTP, browser) to bypass all major anti-bots. | Key |
| ScrapingAnt | Headless Chrome scraping with a simple API | Key |
| ScrapingDog | Proxy API for Web scraping | Key |
| Screenshot | Take programmatic screenshots of web pages from any website | KeyCORS |
| Screenshot Scout | Screenshot API for developers that captures any URL in one HTTP request with predictable output | Key |
| ScreenshotAPI | Website screenshots, PDFs, HTML rendering, caching, and webhooks | KeyCORS |
| ScreenshotAPI.net | Create pixel-perfect website screenshots | KeyCORS |
| Screenshotbase | Screenshot API, 1000 free requests per month | KeyCORS |
| ScreenshotOne.com | Convert URLs, HTML, or Markdown into PNG, JPEG, WebP, or PDF with a simple screenshot API | KeyCORS |
| Scrnify | Screenshot and video capture API to transform any URL into high-quality images and recordings | KeyCORS |
| SearchApi | Real-Time Google SERP API | Key |
| SearXNG | Open-source meta-search engine aggregating results from multiple sources | NoneCORS |
| Sent.dm | Sent is a unified API for messaging across SMS and apps like WhatsApp | KeyCORS |
| SEO Score | Comprehensive SEO audit with 28 checks, scoring, and prioritized recommendations | KeyCORS |
| SEO Tags Generator API | The Generate SEO Tags API generates all the most important META tags based on any content | KeyCORS |
| Serialif Color | Color conversion, complementary, grayscale and contrasted text | None |
| SERP Rank Checker | Check realtime Google SERP Rank of any keywords | KeyCORS |
| SerpApi - Search API | SerpApi's Search API makes it easy and fast to scrape Google and other search engines | Key |
| serpstack | Real-Time & Accurate Google Search Results API | KeyCORS |
| Shadify | Service for generating data and executing logic to create various games and puzzles | NoneCORS |
| Sheet2API | Easy Google Sheets and Excel Online API | Key |
| Sheetsu | Easy google sheets integration | Key |
| Shields | Concise, consistent, and legible badges in SVG and raster format | None |
| SHOUTCLOUD | ALL-CAPS AS A SERVICE | None |
| SiteIntel | Extract metadata, tech stack, emails, and screenshots from any URL | Key |
| Smart Image Enhancement | Performs image upscaling by adding detail to images through multiple super-resolution algorithms | Key |
| Smash | Upload large files on websites, mobile apps, SaaS solutions and custom workflows | KeyCORS |
| SnapAPI | Developer utility API with 13+ tools: QR codes, screenshots, image processing, hashing, and more | KeyCORS |
| Softwium | Validate SQL queries | None |
| Sonar | Project Sonar DNS Enumeration API | NoneCORS |
| SonarQube | SonarQube REST APIs to detect bugs, code smells & security vulnerabilities | OAuth |
| Spanish random names | Generate spanish names (with gender) randomly | None |
| Spanish random words | Generate spanish words randomly | None |
| SQLable | CSV to JSONL conversion API | NoneCORS |
| staffSign | Digital employment contract API with QES/eIDAS support for HR and staffing | KeyCORS |
| Statically | A free CDN for developers | NoneCORS |
| Storj | Decentralized Open-Source Cloud Storage | Key |
| Supadata | Scrape YouTube, web, and files into text. Get AI-ready, clean data for your next project. | KeyCORS |
| Supportivekoala | Autogenerate images with template | KeyCORS |
| Suprsonic | Unified agent API: search, scrape, enrich, image gen, TTS, STT, messaging. One key, 20+ capabilities | KeyCORS |
| Svix | Webhooks as a Service | Key |
| Talordata | SERP data from major search engines with a free trial | Key |
| TalorData | Get structured results from Google, Bing, Yandex, and DuckDuckGo through one API, with fast, reliable responses | Key |
| The Null Pointer | No-bullshit file hosting and URL shortening service | None |
| This Person Does not Exist | Generates real-life faces of people who do not exist | None |
| Thunder Client | API testing tool | NoneCORS |
| Thunderbit | Extract web pages as Markdown or structured data for AI apps | Key |
| TinyMind Agent Tools | Free APIs by an AI agent on a VPS: actor lookup, word-of-the-day, poems, jokes, ping | NoneCORS |
| Todoist | Todo Lists | OAuth |
| Tolgee | Open-source localization (i18n) platform enabling you to translate you app fast | Key |
| Toolcarton | Generate random testimonial data | None |
| TotalShiftLeft Sandbox | Free multi-protocol sandbox: REST, GraphQL & SOAP with OAuth2/JWT auth and OpenAPI 3.0 spec | NoneCORS |
| Travis CI | Sync your GitHub projects with Travis CI to test your code in minutes | Key |
| Tyk | Api and service management platform | KeyCORS |
| URL to Markdown | Convert web page to MarkDown | NoneCORS |
| UserAgent | User agent parsing API is designed to help you better understand and interact with your users. By identifying browser, device, and OS data from user agent strings, this API empowers you with accurate, real-time insights into your audience. | KeyCORS |
| Userstack | Secure User-Agent String Lookup JSON API | OAuth |
| Utilorax | 203 JSON endpoints: hashing, encoding, unit conversion, text, dates and file conversion | KeyCORS |
| UUID Generator | Generate UUIDs | None |
| Vector Express v2.0 | Free vector file converting API | None |
| Vertopal | Convert your files to a variety of formats using Vertopal API | Key |
| WakaTime | Automated time tracking leaderboards for programmers | None |
| WAV to MP3 API | This API lets you convert wav files to mp3 | KeyCORS |
| Web Metadata & Contact Extractor | Extract SEO metadata, contact emails, social links, and tech stack (<200ms) | KeyCORS |
| Web Scraping API | Extract structured data from any public URL | KeyCORS |
| Web3 Storage | File Sharing and Storage for Free with 1TB Space | KeyCORS |
| Webclaw | Web content extraction for LLMs with scrape, crawl, search, and summarize | KeyCORS |
| WebScraping.AI | Web Scraping API with built-in proxies and JS rendering | KeyCORS |
| YAMLine | Convert YAML to JSON (on-the-fly) | NoneCORS |
| Yes No | Generate yes or no randomly | None |
| ZenRows | Web Scraping API that bypasses anti-bot solutions while offering JS rendering, and rotating proxies | Key |
| Zero Retention PDF | Zero-retention HTML to PDF conversion | Key |
| Zube | Full stack project management | OAuth |
| Zuplo | API platform for Development, Deployment, and Docs - add auth, rate-limiting, and monetization fast | Key |