Format or minify JavaScript

Format or minify your code in JavaScript locally in your browser using WebAssembly.

Format your code now!
// Welcome to HappyFormatter!
function greet() {
  console.log("Welcome to HappyFormatter!");
}

function showInstructions() {
  const instructions = [
    "Type or paste JavaScript here",
    "HappyFormatter will format your code"
  ];
  instructions.forEach(instruction => console.log(instruction));
}

greet();
showInstructions();

// DOM Manipulation Example
document.body.innerHTML = "<h1>Welcome to HappyFormatter!</h1>";
Valid javascript
// Welcome to HappyFormatter!
function greet() {
  console.log("Welcome to HappyFormatter!");
}

function showInstructions() {
  const instructions = [
    "Type or paste JavaScript here",
    "HappyFormatter will format your code",
  ];
  instructions.forEach((instruction) => console.log(instruction));
}

greet();
showInstructions();

// DOM Manipulation Example
document.body.innerHTML = "<h1>Welcome to HappyFormatter!</h1>";

JavaScript Formatter


Happy Formatter's JavaScript Formatter and JavaScript Validator help to auto format JavaScript code and validate your JavaScript text.

  • JavaScript formatter online is the best tool to format JavaScript data.
  • JavaScript minifier online is the best tool to minify JavaScript data.
  • It helps to validate JavaScript online with error messages.
  • It's also a JavaScript Beautifier that supports indentation levels: 2 spaces, 3 spaces, and 4 spaces.
  • Supports printing of JavaScript data.
  • Stores data locally for the last JavaScript formatted in the browser's local storage. This can be used as a Notepad++, Sublime, or VSCode alternative for JavaScript beautification.
  • This JavaScript online formatter can also work as JavaScript Lint.
  • Use the auto switch to turn auto-update on or off for beautification.
  • It uses WebAssembly (WASM) to beautify JavaScript, making it easy for a human to read and analyze.
  • Download JavaScript once it's created or modified, and it can be opened in Notepad++, Sublime, or VSCode alternative.
  • JavaScript Format Checker helps to fix the missing quotes; click the setting icon which looks like a screwdriver on the left side of the editor to fix the format.

Know more about javascript:

  • JavaScript is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much everything else.
  • JavaScript is a client-side scripting language which means the source code is processed by the client's web browser rather than on the web server.
  • JavaScript is a lightweight, interpreted programming language. It is designed for creating network-centric applications. It is complimentary to and integrated with Java. JavaScript is very easy to implement because it is integrated with HTML. It is open and cross-platform.
  • JavaScript is a dynamic programming language. It does not have a type declaration, and it uses dynamic typing.
  • JavaScript is a programming language that is characterized as dynamic and weakly typed.

JavaScript Validator


JavaScript Validator Online checks the integrity/syntax of the JavaScript data based on JavaScript Object Notation (JSON) Data Interchange Format Specifications (RFC).

  • It's super easy to find the error when line numbers are highlighted with an in-detail error description.
  • Use the format button as a JavaScript Fixer to repair the error.
  • To validate JavaScript you just need internet and no need to install any software.
  • Your JavaScript data gets validated in the browser itself.

Frequently Asked Questions

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