JSON Schema Store API

Base URL

https://www.schemastore.org/api/json

Authentication

No key or account. The catalogue and the schemas it points at are served as static files.

Rate limit

Not published. It is a static file behind a CDN; download it once at build time rather than per validation.

Pricing

Free and open source, community maintained.

CORS

Enabled — callable directly from browser JavaScript

Official docs

Read the docs

Every request below was executed against the live API on 21 Aug 2026, and the response shown is the real body it returned — not an illustration.

curl 'https://www.schemastore.org/api/json/catalog.json'

const res = await fetch("https://www.schemastore.org/api/json/catalog.json");
if (!res.ok) throw new Error(`Request failed: ${res.status}`);
const data = await res.json();
console.log(data);

import requests

res = requests.get("https://www.schemastore.org/api/json/catalog.json", timeout=20)
res.raise_for_status()
print(res.json())

{
  "$schema": "https://www.schemastore.org/schema-catalog.json",
  "version": 1,
  "schemas": [
    {
      "name": "glslint config",
      "description": "glslint project config and shader-dialect preset (glslint.toml): ecosystem detection, #pragma expansion, shared-library and injected-define declarations",
      "fileMatch": [
        "glslint.toml"
      ],
      "url": "https://raw.githubusercontent.com/johncarmack1984/glslint/main/schema/glslint.schema.json"
    },
    {
      "name": "Mermaid config",
      "description": "Configuration for Mermaid diagrams and charts",
      "fileMatch": [
        "mermaid.config.json",
        ".mermaidrc.json",
        "mermaidrc.json"
      ],
      "url": "https://mermaid.js.org/schemas/config.schema.json"
    },
    {
      "name": "Specpin spec file",
      "description": "Specpin business-spec file (.specs/*.spec.json): rules, descriptions, and acceptance criteria pinned to UI elements",
      "fileMatch": [
        "**/.specs/*.spec.json"
      ],
      "url": "https://specpin.ohnice.app/schema/v1.json"
    },
    {
      "name": "Burnless SRE config",
      "description": "Burnless sre.yaml — SLOs, error budgets, runbooks, on-call, and dashboards as code",
      "fileMatch": [
        "sre.yaml",
        "sre.yml"
      ],
      "url": "https://raw.githubusercontent.com/Custos-com/Burnless/main/schema/sre.schema.json"
    },
    {
      "name": "SigmaCV CV",
      "description": "SigmaCV canonical academic-CV object — open, machine-readable CV metadata (publications, positions, education, funding and narrative sections) ge

$schemastring

Schema describing the catalogue format itself, which is a neat piece of self-description.

versioninteger

Catalogue format version. It has been `1` for a long time; check it before assuming the structure.

schemasarray

Every catalogued schema. The list runs to hundreds of entries and grows continuously.

schemas[].namestring

Display name such as `Mermaid config`. Use it for humans only; it is not an identifier.

schemas[].descriptionstring

One-line explanation of what the file governs. Frequently absent on older entries.

schemas[].fileMatcharray of strings

Glob patterns identifying the files this schema validates, for example `["mermaid.config.json", ".mermaidrc.json"]`. This is the field to match on.

schemas[].urlstring

Where the schema actually lives, often a third-party or raw GitHub URL rather than schemastore.org itself.

schemas[].versionsobject

Present on some entries: a map of version label to schema URL, for tools whose config format has changed.

• Validate configuration files in CI using the same schemas your editor uses
• Build editor or language-server support for config file autocompletion
• Discover whether a schema already exists before writing one yourself
• Mirror the schemas your project depends on for offline or air-gapped builds
• Generate documentation or TypeScript types from a config file's official schema

If JSON Schema Store 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.