The zero-setup API your class can practise against
Teaching REST or API testing means every student needs a working backend, and setup eats the lesson. ReqRes is a live API students call from any browser, no signup, no install. Real endpoints, real auth, real error codes to practise on.
The public API is free and keyless. Isolated per-student projects are on the Classroom plan, with regional pricing.
The backend is the part that eats the lesson.
You want to teach HTTP verbs, status codes, JSON, auth, and how to test an API. Instead the first hour goes to installing Node, running a server, fixing a port conflict on one laptop, and a database that will not start on another. Half the class is stuck before anyone has made a request.
ReqRes removes the backend from the equation. It is a real, hosted API. A student opens a browser or a terminal and makes a request that actually works, on the school network, on a Chromebook, on a phone. The lesson is the API, not the setup.
A first lesson in one line
No signup, no key. Every student can run this on day one and get a real JSON response back:
curl https://reqres.in/api/users/2Then the unhappy path, so they learn to read status codes, not just bodies:
curl -i https://reqres.in/api/users/23 # 404
curl -i -X POST https://reqres.in/api/register \
-H "Content-Type: application/json" \
-d '{"email":"eve.holt@reqres.in"}' # 400, missing passwordThere is an interactive version right on the homepage: pick an endpoint, hit send, read the real response. Nothing to install.
Everything an API testing unit needs to cover
Full CRUD with correct status codes (200, 201, 204). Students learn each verb against responses that behave the way the spec says they should.
Real auth flow with tokens on success and 400s on bad input, so an auth lesson is a live demo, not a diagram.
Deliberate failures to assert against. Testing is mostly the unhappy path, and here it is on tap.
Paged list responses and a delay parameter, so students exercise pagination and client-side timeouts in an exercise, not a lecture.
Works from any client the course already uses: fetch(), curl, Postman, Playwright, Python requests, Java, C#.
Run it for a whole class
The shared demo API is enough for early lessons. When you want each student to build and persist their own collections, the Classroom plan gives every student an isolated project so their data never collides with a classmate's, plus a roster so you can see who is set up.
There is regional pricing, so it is priced for a classroom in your country, not a company. Educators have set up a whole cohort in an afternoon.
Why not a local server or a static mock?
| Need | Run a backend / static mock | ReqRes |
|---|---|---|
| Student setup on day one | Install Node, run a server, fix ports | Open a browser, make a request |
| Practise error codes | JSONPlaceholder returns 200 forever | 404, 400, 429, 500 on demand |
| Auth flow to test | Build it yourself | register / login with real tokens |
| Each student their own data | One shared server or many to manage | Isolated project per student (Classroom) |
| See who is set up | Ask around | Roster view |
Start your next lesson without the setup
The public API is free and keyless. Create a free account when students need their own data, or set up the whole class on the Classroom plan.