Playwright API Testing Demo for Beginners

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Project Setup
Create a API Test Step-by-Step
How to run a GET API Request
How to run a POST API Request
How to run a PUT API Request
How to run a DELETE API Request
How to validate API Response
Check response, logs, errors in UI Mode
Check HTML Report

API Testing with Playwright - Project Setup

Step 1 - Create a new folder for API Testing Project
Step 2 - Open the folder in VS Code
Step 3 - Open terminal on the location of the folder and run command npm init playwright@latest

Step 4 - Check if demo tests are running fine using commands npx playwright test
npx playwright test --ui
npx playwright show-report

Step 5 - Create a new file for API Tests (api-tests.spec.js)


*How to run a GET API Request *

Step 1 - Add imports
import { test, expect } from '@playwright/test';

Step 2 - Create a test using request context
test.only('Demo API Test', async({request}) =＞ { })

Step 3 - Send a GET request & store response in a variable
const response = await request.get('https://reqres.in/api/users/2')

Step 4 - Verify the status code of the response is 200
expect(response.status()).toBe(200);

Step 5 - Check response contains some text
const text = await response.text();
expect(text).toContain('Janet');

Step 6 - Write response on the console
console.log(await response.json());

Step 7 - Run and check results


How to run a POST API Request

Step 1 - Add imports
import { test, expect } from '@playwright/test';

Step 2 - Create a test using request context
test.only('Demo API POST request’, async({request}) =＞ {...})

Step 3 - Send a POST request along with request body & store response in a variable

const response = await request.post("https://reqres.in/api/users", {
data: {
"name": "Raghav",
"job": "teacher"
}
})

Step 4 - Verify response status code is 201
expect(response.status()).toBe(201);

Step 5 - Check response contains some text
const text = await response.text();
expect(text).toContain(Raghav);

Step 6 - Write response on the console
console.log(await response.json());

Step 7 - Run and check results


How to run a PUT API Request

test('Demo API PUT Request', async ({ request }) =＞ {

const response = await request.put("https://reqres.in/api/users/2", {
data: {
"name": "Raghav",
"job": "teacher"
}
})
expect(response.status()).toBe(200);
const text = await response.text();
expect(text).toContain('Raghav');
console.log(await response.json());

})


How to run a DELETE API Request

test('Demo API DELETE Request', async ({ request }) =＞ {

const response = await request.delete("https://reqres.in/api/users/2")
expect(response.status()).toBe(204);
})


References
https://playwright.dev/docs/api-testi...
https://playwright.dev/docs/api/class...
https://playwright.dev/docs/api/class...
https://playwright.dev/docs/api/class...
https://reqres.in/

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