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Read a Value from cookie in JavaScript

Anonymous User 654 19 Jul 2021

How do I create and read a value from cookie in JavaScript?

javascript javascript
Updated 29 Nov 2023
Anonymous User
Anonymous User

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1 Answers

Aryan Kumar
Aryan Kumar 29 Nov 2023
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To read a value from a cookie in JavaScript, you can use the document.cookie property. The document.cookie property contains all the cookies associated with the current document. Here's an example of how you can read a value from a cookie:

// Function to get a specific cookie value by name
function getCookie(name) {
    // Split the cookie string into individual cookies
    var cookies = document.cookie.split(';');

    // Loop through the cookies to find the one with the specified name
    for (var i = 0; i < cookies.length; i++) {
        var cookie = cookies[i].trim();

        // Check if this is the cookie we're looking for
        if (cookie.startsWith(name + '=')) {
            // Extract and return the cookie value
            return cookie.substring(name.length + 1);
        }
    }

    // Return null if the cookie is not found
    return null;
}

// Example: Read a cookie named "username"
var usernameCookie = getCookie('username');

// Check if the cookie exists
if (usernameCookie) {
    console.log('Username found in cookie:', usernameCookie);
} else {
    console.log('Username cookie not found.');
}

In this example, the getCookie function takes a cookie name as a parameter, splits the document.cookie string into individual cookies, and then searches for the cookie with the specified name. If found, it returns the value of that cookie. If not found, it returns null.

Remember that cookies are stored as key-value pairs separated by semicolons. The startsWith method is used to check if a particular cookie starts with the specified name.

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