How can I handle cookies in Puppeteer?

Cookies are small pieces of data stored on the user's computer by the web browser while browsing a website. They hold a modest amount of data specific to a particular client and website and can be accessed either by the web server or the client computer.

Puppeteer is a Node library which provides a high-level API to control headless Chrome or Chromium over the DevTools Protocol. Puppeteer runs headless by default but can be configured to run full (non-headless) Chrome or Chromium.

Handling cookies in Puppeteer is straightforward. You can set, delete, and get cookies with the functions page.setCookie(), page.deleteCookie(), and page.cookies() respectively.

Here is an example in JavaScript on how to handle cookies in Puppeteer:

const puppeteer = require('puppeteer');

(async () => {
    const browser = await puppeteer.launch();
    const page = await browser.newPage();

    // Navigate to a website
    await page.goto('http://example.com');

    // Set a cookie
    await page.setCookie({name: 'test', value: '123'});

    // Get cookies
    let cookies = await page.cookies();
    console.log(cookies);

    // Delete a cookie
    await page.deleteCookie({name: 'test'});

    cookies = await page.cookies();
    console.log(cookies);

    await browser.close();
})();

In the above example:

• We first navigate to the website where we want to handle cookies.
• We set a cookie with the name 'test' and the value '123'.
• We then get all cookies and print them to the console.
• We delete the cookie with the name 'test'.
• Finally, we get all cookies again and print them to the console. The cookie 'test' we set earlier should now be gone.

This is a basic example of how you can handle cookies in Puppeteer. Depending on the website, you might have to handle session cookies, secure cookies, or httpOnly cookies, which would require a more advanced setup.