API automation and Selenium WebDriver are typically used for different purposes. Selenium is primarily used for automating web applications through browsers, while API automation focuses on testing and interacting with application programming interfaces (APIs). However, you can use tools and libraries in conjunction with Selenium to perform API automation. Here’s a high-level overview of how you can perform API automation using Selenium in JavaScript:

1. Choose a Testing Framework: For API automation in JavaScript, you can choose a testing framework like Mocha, Jasmine, or Jest. These frameworks provide a structured way to write and run test cases.

2. Install Necessary Libraries: You’ll need libraries to make HTTP requests and assertions in your API tests. axios is a popular choice for making HTTP requests, and chai or assert can be used for assertions. You can install these libraries using npm:

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   npm install axios chai

3. Write Test Cases: Create test cases that automate API interactions. Here’s an example using Mocha and Axios to test a simple API:

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   const axios = require('axios'); const chai = require('chai'); const expect = chai.expect; describe('API Automation', () => { it('should fetch user data', async () => { const response = await axios.get('https://jsonplaceholder.typicode.com/users/1'); expect(response.status).to.equal(200); expect(response.data.name).to.equal('Leanne Graham'); }); });

   In this example, we’re making a GET request to an API endpoint and asserting the response status code and data.

4. Run Tests: You can use a test runner like Mocha to execute your API tests. Run the tests using the following command:

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   mocha your-test-file.js

   Replace your-test-file.js with the name of your test script.

5. Integration with Selenium WebDriver: If your application involves both web and API interactions, you can integrate your API tests with Selenium WebDriver. For example, you can use Selenium to navigate to a web page, perform actions, and then trigger API requests as part of your end-to-end tests.