Will I learn how to test APIs using Playwright?

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What You’ll Learn About API Testing in Playwright

Using Playwright’s APIRequestContext

Playwright provides an in-built API to send HTTP requests directly (GET, POST, PUT, DELETE, etc.).

You don’t need a separate tool like Postman for automation inside tests.

Making API Calls

Send API requests before or after UI steps (for setup/cleanup).

Example: Create a user via API before testing the login UI.

Validating API Responses

Check status codes (200, 400, 500, etc.).

Validate JSON/XML response body.

Ensure headers, cookies, tokens are correct.

Integration with UI Tests

Combine API and UI workflows:

Example: Login via API → use the session token in browser context → continue UI testing without filling login forms repeatedly.

Advanced Features

Handle authentication (JWT, OAuth, Basic Auth).

Test error handling and edge cases.

Use API tests in CI/CD pipelines for faster checks.

🔹 Example (Playwright API Test – JavaScript)

import { test, expect, request } from '@playwright/test';

test('Verify API response', async ({ request }) => {

  const response = await request.get('https://jsonplaceholder.typicode.com/posts/1');

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

  const body = await response.json();

  expect(body).toHaveProperty('id', 1);

  expect(body).toHaveProperty('title');

});

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