qevroJavaScript Formatter
Paste or upload your JavaScript to beautify, format, and validate it. Supports ES6+, JSX, and TypeScript.
About JavaScript Formatting
What is JavaScript?
JavaScript is the programming language of the web, running in every browser and increasingly on servers (Node.js). It powers interactive websites, web apps, APIs, mobile apps, and more. Properly formatted JavaScript is crucial for team collaboration and code maintainability.
How to Format JavaScript Online
Paste your JavaScript code, click Format, and get beautified code with proper indentation, consistent brace style, and clean line wrapping. The tool uses a real ES6+ parser (Acorn) for accurate validation, catching syntax errors with exact line positions.
JavaScript Code Analysis
Beyond formatting, the tool analyzes your code and shows: function count (regular + arrow), class count, variable declarations (let/const/var breakdown), imports, exports, async/await usage, loops, conditionals, comments, and total line count. It also warns about console.log statements and var usage.