Zuplo Echo API

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.

No API key requiredHTTPSFree tier

Endpoint tested and returned HTTP 200 on 19 Aug 2026

What is the Zuplo Echo API?

Zuplo Echo is a free, key-free HTTP testing endpoint that reflects your request back as JSON — method, URL, query parameters, headers and body — so you can see exactly what your client sent.

Echo services are the fastest way to answer 'what is my HTTP client actually sending?'. Point a request at this endpoint and the response tells you the method, the parsed query string, every header including ones your library added silently, and the body.

It accepts any method and any path, which makes it useful for testing routing, proxies and middleware as well as plain client behaviour. It is a modern alternative to httpbin, which has become unreliable.

Quick facts

Base URL: https://echo.zuplo.io
Authentication: No API key required.
Rate limit: No published limit; intended for interactive debugging rather than load testing.
Pricing: Free, provided by Zuplo.
CORS: Not enabled — call it from your server
Official docs: Read the docs

How to use the Zuplo Echo API

Every request below was executed against the live API on 19 Aug 2026, and the response shown is the real body it returned — not an illustration.

1. Echo a request back as JSON

GET https://echo.zuplo.io/

curl

curl 'https://echo.zuplo.io/'

JavaScript (fetch)

const res = await fetch("https://echo.zuplo.io/");
if (!res.ok) throw new Error(`Request failed: ${res.status}`);
const data = await res.json();
console.log(data);

Python (requests)

import requests

res = requests.get("https://echo.zuplo.io/", timeout=20)
res.raise_for_status()
print(res.json())

Response — HTTP 200

{
  "url": "https://echo.zuplo.io/",
  "method": "GET",
  "query": {},
  "headers": {
    "accept": "application/json, */*",
    "accept-encoding": "gzip, br",
    "connection": "Keep-Alive",
    "host": "echo.zuplo.io",
    "true-client-ip": "182.185.143.210",
    "user-agent": "ByteTools-APIDirectory/1.0 (+https://bytetools.bytevancer.com; contact@bytevancer.com)",
    "x-forwarded-proto": "https",
    "x-real-ip": "182.185.143.210",
    "zp-rid": "76dfbcd4-47f4-4c9d-bfbe-e06aafdc99cf"
  }
}

Parameters

Parameter	Type	Required	Description
`(any path)`	path	Optional	Any path is accepted and reflected back. `/test/path`
`(any query)`	query	Optional	Query parameters are parsed and returned in `query`. `?a=1&b=2`
`(any header)`	header	Optional	Every header sent is reflected in `headers`. `X-Custom: value`
`(any body)`	body	Optional	Request bodies are echoed on POST, PUT and PATCH. `{"key":"value"}`

Response fields

urlstring: Full URL as the server received it.
methodstring: HTTP method used.
queryobject: Parsed query string parameters.
headersobject: Every header received, including those added by your HTTP library.
bodystring|object: The request body, when one was sent.

What you can build with the Zuplo Echo API

Confirm which headers your HTTP client actually sends
Debug why an API rejects your request by inspecting what was transmitted
Test proxy, gateway and middleware header rewriting
Teach HTTP fundamentals with immediate visible feedback

Common errors and how to fix them

Body missing on POST

No Content-Type header was sent, so the body was not parsed.

Fix: Set Content-Type explicitly — this is exactly the class of bug an echo service exposes.

Unexpected headers present

Your HTTP library adds headers you did not set.

Fix: That is the point of the tool; compare against what the target API expects.

Zuplo Echo API — frequently asked questions

What is an echo API used for?

It reflects your HTTP request back as JSON so you can verify exactly what your client sent — headers, query parameters and body. It is a debugging tool, not a data source.

Is Zuplo Echo free?

Yes, free with no API key or signup required.

How is this different from httpbin?

It serves the same purpose but is more reliably available. httpbin.org has suffered extended outages, which makes it a poor dependency for tutorials or CI.

Can I use it to test POST requests?

Yes, it accepts any HTTP method and echoes the body back. Remember to set Content-Type or the body will not be parsed.

Tools that pair with this API

JSON Formatter

Format, beautify and minify JSON online with 2-space, 4-space or tab indentation. Sort keys alphabetically and catch syntax errors instantly — free and private.

JWT Decoder

Decode JWT header and payload instantly, with human-readable iat/exp/nbf timestamps and an expiry badge. Client-side only — tokens never leave your browser.

Base64 Decoder

Decode Base64 to readable text or download it as a file. Handles URL-safe base64url and missing padding automatically. Free, private, in-browser decoder.

Alternatives to Zuplo Echo API

If Zuplo Echo does not fit, these developer & testing apis cover similar ground. Every one was called before publishing, and each links to its own reference page with a working curl command and the response it returned.

API	What it does	Auth	CORS	Last verified
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.	No key	Yes	19 Aug 2026
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.	No key	Yes	19 Aug 2026
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.	No key	No	19 Aug 2026
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.	No key	Yes	19 Aug 2026
Ecosyste.ms	Free Ecosyste.ms API with no key: package metadata, dependencies, repository data and usage statistics across 60+ package registries. Tested curl example.	No key	No	20 Aug 2026
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.	No key	Yes	20 Aug 2026

All Developer & Testing APIs

Zuplo Echo is an independent third-party service and is not affiliated with ByteTools or ByteVancer. Details on this page were verified on 19 Aug 2026; always check the official documentation before relying on this API in production, as terms and limits can change.