Free Public REST API for Testing

A live, fully-featured public REST API you can call from Postman, curl, or any HTTP client — full CRUD on users, products, orders and more. No API key, no signup, no rate-limit surprises.

Why use this REST API?

Most "free public APIs" are read-only or rate-limited into uselessness. This one isn't. You get real CRUD — POST creates persist within your session, PATCH actually patches, DELETE actually deletes — across multiple resources, with realistic pagination, filtering and error simulation built in.

No API key, no signup — call any endpoint right now.
Full CRUD on users, products, orders, posts and more.
Session-scoped data — your changes are isolated to your client, perfect for parallel testing.
Error simulation — append ?error=500, ?delay=2000, or ?random_fail=true to test retry logic.
Swagger / OpenAPI 3.0 spec at /docs — import into Postman in one click.

Quick start — one curl command

curl https://demo.totalshiftleft.ai/api/v1/users

Try it in Postman, Insomnia, Bruno or any HTTP client

Import the OpenAPI spec to auto-generate a collection of every endpoint:

https://demo.totalshiftleft.ai/openapi.json

Sample endpoints

Method	Path	What it does
GET	/api/v1/users	List users with pagination
POST	/api/v1/users	Create a user
GET	/api/v1/users/:id	Get one user
PATCH	/api/v1/users/:id	Update user fields
DELETE	/api/v1/users/:id	Delete a user
GET	/api/v1/products?category=books&page=2	Filter + paginate
POST	/api/v1/orders	Create an order (cross-resource)

JavaScript fetch example

const r = await fetch('https://demo.totalshiftleft.ai/api/v1/users', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ name: 'Ada Lovelace', email: 'ada@example.com' })
});
console.log(await r.json());

Use cases this REST API is built for

Practicing REST calls while learning Postman, Insomnia or Bruno
Wiring up a frontend (React, Vue, Svelte) before the real backend exists
QA / automation training — RestAssured, Karate, Cypress, Playwright
Load testing rehearsal with k6, JMeter or Locust
Workshop / classroom demos of REST fundamentals

Frequently asked questions

Is this REST API really free?

Yes. No signup, no API key, no credit card. Generous fair-use rate limits per IP. Forever free.

Can I write data (POST / PATCH / DELETE)?

Yes. Writes persist within your session for 30 minutes so multiple users do not collide. Re-run a scenario any time.

How is this different from JSONPlaceholder?

JSONPlaceholder fakes writes — POST returns 201 but nothing is stored. This sandbox actually persists data, supports filtering and pagination, and exposes the same data over GraphQL and SOAP too.

Where is the OpenAPI / Swagger spec?

At /docs (Swagger UI) and /openapi.json (raw JSON). Import either into Postman to auto-generate a full collection.

Other free public APIs in this sandbox

Ready to try it?

Open the live sandbox — REST, GraphQL, SOAP and auth in one place. No signup, no API key.

Open the API Sandbox →

Topics: free REST API · public REST API · REST API for testing · REST sandbox · JSONPlaceholder alternative · DummyJSON alternative · ReqRes alternative · REST API for Postman practice · sample REST endpoints · free APIs for QA automation · REST API tutorial 2026