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blueimp-md5: The Ultimate Guide to JavaScript MD5 Hashing

How to Download and Use Blueimp-MD5

If you are looking for a simple and fast way to generate MD5 hashes in JavaScript, you might want to check out blueimp-md5. In this article, you will learn what blueimp-md5 is, how to download it, and how to use it in your projects.

What is blueimp-md5 and what is it used for?

Blueimp-md5 is a JavaScript library that implements the MD5 message-digest algorithm. It is compatible with server-side environments like Node.js, module loaders like RequireJS or webpack, and all web browsers.

blueimp-md5 download

Blueimp-md5 can be used to calculate the (hex-encoded) MD5 hash of a given string value or key. This can be useful for authenticating messages, verifying data integrity, or generating unique identifiers. However, blueimp-md5 is not suitable for data encryption or security purposes, as MD5 is a weak and vulnerable hash function.

What is MD5 and how does it work?

MD5 stands for Message-Digest Algorithm 5. It is a cryptographic hash function that takes an input of any length and produces a fixed-length output of 128 bits (32 hexadecimal digits). A hash function is a one-way function that maps an input to an output in such a way that it is easy to compute the output from the input, but hard to find the input from the output.

MD5 works by dividing the input into blocks of 512 bits each and applying a series of mathematical operations on them. The result is a digest value that represents the input. The idea is that any change in the input, even by one bit, will cause a significant change in the output, making it difficult to find two inputs that produce the same output. This property is called collision resistance.

How to download blueimp-md5

There are two main ways to download blueimp-md5: using NPM or using CDN.

Using NPM

NPM stands for Node Package Manager. It is a tool that allows you to install and manage packages (libraries or modules) for Node.js or JavaScript projects. To use NPM, you need to have Node.js installed on your system.

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To install blueimp-md5 with NPM, you can run the following command in your terminal:

npm install blueimp-md5

This will download and save the blueimp-md5 package in your node_modules folder. You can then require it in your JavaScript code like this:

var md5 = require("blueimp-md5");

Using CDN

CDN stands for Content Delivery Network. It is a network of servers that deliver static content (such as images, scripts, or stylesheets) to users based on their geographic location. Using a CDN can improve the performance and availability of your website or application.

To use blueimp-md5 with CDN, you can include the (minified) JavaScript MD5 script in your HTML markup like this:

<script src="

This will load the script from, which is a free CDN service that hosts many popular JavaScript libraries. You can then access the md5 function in your JavaScript code like this:

var hash = md5("value");

How to use blueimp-md5

Once you have downloaded and included blueimp-md5 in your project, you can use it to generate MD5 hashes of any string value or key. Here are some examples of how to use blueimp-md5 in different scenarios.

Client-side example

If you want to use blueimp-md5 in a web browser, you can create a simple HTML form that takes a user input and displays the corresponding MD5 hash. For example, you can use the following HTML code:

<script src="

Enter a value:

Generate MD5

// Get the form element var form = document.getElementById("md5-form"); // Get the input element var input = document.getElementById("input"); // Get the output element var output = document.getElementById("output"); // Add an event listener to the form submit event form.addEventListener("submit", function (event) // Prevent the default form submission behavior event.preventDefault(); // Get the input value var value = input.value; // Calculate the MD5 hash of the value var hash = md5(value); // Display the hash in the output element output.textContent = "MD5: " + hash; );

This will create a simple web page that looks like this:

You can enter any value in the input field and click on the Generate MD5 button to see the MD5 hash of that value.

Server-side example

If you want to use blueimp-md5 in a Node.js application, you can create a simple HTTP server that responds with the MD5 hash of a given query parameter. For example, you can use the following JavaScript code:

// Require the http module var http = require("http"); // Require the url module var url = require("url"); // Require the blueimp-md5 module var md5 = require("blueimp-md5"); // Create a server object var server = http.createServer(function (req, res) // Parse the request url var parsedUrl = url.parse(req.url, true); // Get the query parameter named "value" var value = parsedUrl.query.value; // Calculate the MD5 hash of the value var hash = md5(value); // Set the response header content type to plain text res.setHeader("Content-Type", "text/plain"); // Write the hash to the response body res.write("MD5: " + hash); // End the response res.end(); ); // Listen on port 3000 server.listen(3000, function () console.log("Server is running on port 3000"); );

This will create a simple HTTP server that listens on port 3000. You can make requests to this server with any value as a query parameter and get the MD5 hash of that value as a response. For example, if you make a request to you will get this response:

MD5: 5d41402abc4b2a76b9719d911017c592

Advantages and disadvantages of blueimp-md5

Blueimp-md5 is a convenient and easy-to-use library for generating MD5 hashes in JavaScript. However, it also has some limitations and drawbacks that you should be aware of. Here are some of the pros and cons of using blueimp-md5.


  • It is fast and lightweight. It has zero dependencies and does not require any external libraries or modules.

  • It is compatible with all web browsers and server-side environments. It supports AMD, CommonJS, and ES6 module formats.

  • It is simple and intuitive. It has a single function that takes a string value or key and returns a hex-encoded MD5 hash.

  • It is open source and free to use. It is licensed under the MIT license and hosted on GitHub.


  • It is not secure or reliable. MD5 is an outdated and weak hash function that has been proven to be vulnerable to collisions, meaning that it is possible to find two different inputs that produce the same output. This can compromise the security and integrity of your data.

  • It is not recommended for encryption or password hashing. MD5 is a fast and reversible hash function, which makes it easy to crack or brute-force. It does not provide any salt or key stretching mechanisms to increase the difficulty of breaking the hash. You should use more secure and modern algorithms like SHA-256 or bcrypt for encryption or password hashing.

  • It is not standardized or widely supported. MD5 is not an official standard of any organization or authority. It is not part of the JavaScript language specification or the Web Crypto API. It may not be available or consistent across different platforms or environments.


Blueimp-md5 is a JavaScript library that allows you to generate MD5 hashes of any string value or key. It is fast, easy, compatible, and zero-dependency. However, it is also insecure, unreliable, and outdated. You should use blueimp-md5 only for non-critical purposes, such as ge


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