Free API for Postman Practice

Most "Postman practice" APIs are read-only fakes. This one persists writes, runs real auth flows, exposes a real OpenAPI 3.0 spec for one-click import, and ships error simulation so your tests can fail on demand.

One-click Postman import

In Postman: Import → Link → paste this URL:

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

Every endpoint becomes a request, with example bodies pre-filled.

What you can practice

• Variables and environments — swap base URLs and tokens cleanly
• Pre-request scripts — auto-fetch a JWT and set {{token}}
• Tests — assert status codes, JSON shape, response time
• Chained requests — create a user, then create an order for them
• Collection Runner / Newman — run the whole flow in CI
• Mock servers — pair Postman's mock with this real backend
• Monitor — schedule the collection and watch it run

Step-by-step tutorial

Read the full walkthrough: How to Test a REST API with Postman.

Frequently asked questions

Do I need a paid Postman plan?

No. Everything described works on the free tier.

Will my data persist between requests?

Yes — for 30 minutes per session. Perfect for chained-request workflows.

Other free public APIs in this sandbox

Topics: API for Postman practice · free API for Postman · Postman test API · learn Postman · Postman tutorial API · APIs to practice with Postman