Lecture 297:- Creating and Altering a Cookie

To create and alter a cookie, you need to use the cookie-parser middleware in your Express application. Here are the steps to create and alter a cookie:

1. Install the cookie-parser middleware by running npm install cookie-parser in your project directory.

2. Import the cookie-parser middleware in your main application file, such as app.js, using the following code:

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   const cookieParser = require('cookie-parser');

3. Use the cookieParser middleware in your Express application by adding the following line of code after your app has been instantiated:

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   app.use(cookieParser());

4. To create a cookie, you can use the res.cookie() method provided by the cookie-parser middleware. The res.cookie() method takes two arguments: the name of the cookie and its value. For example:

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   res.cookie('myCookie', 'hello world');

   This will create a cookie named myCookie with the value hello world.

5. To alter an existing cookie, you can use the res.cookie() method with the same cookie name but a different value. For example:

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   res.cookie('myCookie', 'new value');

   This will change the value of the myCookie cookie to new value.

Note that cookies can also have additional options, such as expiration dates and domain names. You can include these options as additional arguments to the res.cookie() method.