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. No rate limit, fair use. Forever free.

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

Yes. Writes persist within your session (30 minutes of inactivity) 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