JavaScript: Generate a UUID in Node.JS.

JavaScript fundamental (ES6 Syntax): Exercise-254 with Solution

Generate UUID (Node.js)

Write a JavaScript program to generate a UUID in Node.JS. Use crypto API to generate a UUID, compliant with RFC4122 version 4.

• Use crypto.randomBytes() to generate a UUID, compliant with RFC4122 version 4.
• Use Number.prototype.toString(16) to convert it to a proper UUID.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
// Import the 'crypto' module from Node.js for cryptographic functionality
const crypto = require('crypto');

// Define a function 'UUIDGeneratorNode' to generate a UUID (Universally Unique Identifier) in a Node.js environment
const UUIDGeneratorNode = () =>
  // Generate a UUID using a random number generator provided by the 'crypto' module
  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
    // For each character 'c' in the UUID template, replace it with a randomly generated hexadecimal digit
    (c ^ (crypto.randomBytes(1)[0] & (15 >> (c / 4)))).toString(16)
  );

// Generate and log a UUID using the 'UUIDGeneratorNode' function
console.log(UUIDGeneratorNode());

Flowchart:

For more Practice: Solve these Related Problems:

• Write a JavaScript program in Node.js that uses the crypto module to generate an RFC4122 version 4 UUID.
• Write a Node.js function that creates a UUID by generating random bytes and formatting them into a standard string.
• Write a JavaScript program that leverages crypto.randomUUID() (if available) to produce a UUID and logs the result.
• Write a Node.js script that validates the generated UUID against the version 4 specification using regex.

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