Formatter
JavaScript Formatter
Format and beautify JavaScript online with consistent indentation and readable code structure. Process source code locally in your browser.
Tool
Format and beautify JavaScript online with consistent indentation and readable code structure. Process source code locally in your browser.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free JavaScript Formatter to turn minified or poorly formatted JavaScript into readable source code. Paste a function, module, class, script, or complete source file, choose an indentation style, and generate a consistently formatted result. Modern syntax such as modules, async functions, optional chaining, classes, template literals, and arrow functions can be processed locally in your browser without executing the code.
Examples
- const greet=(name)=>{const message=`Hello, ${name}!`;console.log(message)};greet("World");
- async function loadUsers(){const response=await fetch("/api/users");if(!response.ok){throw new Error("Request failed")}return response.json()}
- document.querySelectorAll(".button").forEach((button)=>{button.addEventListener("click",()=>console.log(button.dataset.id))})
Frequently Asked Questions
Does the JavaScript Formatter execute my code?
No. The source is parsed and formatted but is not intentionally executed.
Can the formatter detect syntax errors?
Yes. Invalid or unsupported JavaScript syntax should produce an error instead of an unreliable formatted result.
Are comments preserved?
Yes. Line comments, block comments, documentation comments, and important license comments should remain in the output.
Is my JavaScript uploaded?
No. JavaScript parsing and formatting run locally in your browser.