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2026-07-29 16:01
REST API

OAuth 2.0 Token Exchange

AuthRequestValidateHard
Try Interactive Demo

What you will learn

  • Validate token response envelope strictly: access_token, token_type, expires_in, optional refresh_token — missing fields break client flows silently
  • Test all four grant types (auth code, client creds, password, refresh) if supported — each has distinct failure modes
  • Never put tokens in URL query strings — they leak via Referer, browser history, and server access logs

Description

Exchange authorization code for access token. Implement OAuth flow.

Test Scenario

const response = await request.post('/api/v1/auth/oauth/token', {
  data: {
    grant_type: 'authorization_code',
    code: 'auth_code',
    client_id: 'client_123'
  }
});
const { access_token, refresh_token } = await response.json();
Endpoint/api/v1/auth/oauth/token

Testing Tips

  • •POST with grant_type, code, client_id
  • •Handle refresh token flow
  • •Check token scopes
// Playwright API Testing - REST
import { test, expect } from '@playwright/test';


test('REST API request', async ({ request }) => {
  const response = await request.get('/api/v1/resource');


  expect(response.ok()).toBeTruthy();
  expect(response.status()).toBe(200);


  const data = await response.json();
  expect(data).toBeDefined();
});

Challenge ID: rest-auth-oauth-token

2 frameworks available

API Playground

Send requests and inspect responses

Endpoint: /api/v1/auth/oauth/token

Press Enter to send