JavaScript Beautifier and Formatter

This JavaScript beautifier and formatter cleans, prettifies, and formats minified or messy JavaScript into consistent, readable code. The tool runs in your browser so there is no installation required. Paste your code or upload file, select formatting options, and get instantly readable JavaScript you can copy or download.

What this tool does

  • Beautify JavaScript code so it follows common formatting standards
  • Format JS online with customizable indent size and indent character
  • Control brace style, function spacing, and operator position
  • Preserve or normalize newlines and comments
  • Support a quick switch between compact and expanded output
  • Free to use and private because all work happens in the browser

Key features

  • javascript beautifier online with one click
  • format code javascript online or use as a JS code formatter online
  • Tons of customization options to format code online instantly
  • keep arrays and chains readable with advanced chain handling
  • wrap long lines at a configurable wrap length
  • settings to match your project style or standard guidelines

How to use this JavaScript formatter

  1. Paste raw, minified, or crowded JavaScript into the left editor
  2. Pick indent size, indent char, brace style, and function spacing
  3. Toggle Keep Newlines if you want to preserve human placed breaks
  4. Click the Beautify or Format button to run the js formatter online
  5. Copy the formatted JavaScript or download the file for your project

Example 1: Minified vs beautified

Minified JS

Copy
function greet(n){return"Hello, "+n+"!"}function factorial(n){return n<=1?1:n*factorial(n-1)}function randomHex(){return"#"+Math.floor(Math.random()*16777215).toString(16)}console.log(greet("Alice"));console.log("Factorial of 5:",factorial(5));console.log("Random Color:",randomHex());

Beautified JS

Copy
function greet(n) {
    return "Hello, " + n + "!"
}

function factorial(n) {
    return n <= 1 ? 1 : n * factorial(n - 1)
}

function randomHex() {
    return "#" + Math.floor(Math.random() * 16777215).toString(16)
}
console.log(greet("Alice"));
console.log("Factorial of 5:", factorial(5));
console.log("Random Color:", randomHex());

Example 2: Complex snippet

Minified JS

Copy
function formatString(e,...t){return e.replace(/{(d+)}/g,(e,n)=>void 0!==t[n]?t[n]:e)}function validateEmail(e){return/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,}$/.test(e)}function debounce(t,n){let u;return(...e)=>{clearTimeout(u),u=setTimeout(()=>t(...e),n)}}function throttle(t,n){let u=!1;return(...e)=>{u||(t(...e),u=!0,setTimeout(()=>u=!1,n))}}

Beautified JS

Copy
function formatString(e, ...t) {
    return e.replace(/{(d+)}/g, (e, n) => void 0 !== t[n] ? t[n] : e)
}

function validateEmail(e) {
    return /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,}$/.test(e)
}

function debounce(t, n) {
    let u;
    return (...e) => {
        clearTimeout(u), u = setTimeout(() => t(...e), n)
    }
}

function throttle(t, n) {
    let u = !1;
    return (...e) => {
        u || (t(...e), u = !0, setTimeout(() => u = !1, n))
    }
}

Customization options

Adjust these settings to match your team style or personal preference. Use the Defaults control to restore recommended values.

Option Default Description
Indent Size 4 Number of spaces or tabs per indentation level
Indent Char Space Choose tabs or spaces for indentation
Indent with Tabs False Use tabs to indent code/td>
EOL LF End of line character for the formatted output
Ending Newline False Add a trailing newline at the end of the file
Keep Newlines True Preserve existing blank lines from the original code
Indent Level 0 Starting indentation offset for the entire document
Max Newlines 3 Maximum consecutive blank lines allowed in the output
Space in () False Add space inside parenthesis when true
Empty () Space False Space style for empty parenthesis
Anon Fn Space False Space between function keyword and parenthesis for anonymous functions
Named Fn Space False Space between function name and parenthesis for named functions
Brace Style Collapse Control placement of opening braces for blocks and functions
Break Chains False Break long method chains across lines for readability
No Chain Indent False Disable additional indent for broken chains
Keep Arrays False Preserve array formatting where practical
Unescape False Convert escaped sequences to readable characters when safe
Wrap Length 0 Maximum characters per line before wrapping. Zero means no wrap
Comma First False Place comma at the start of a line for multi line lists when true
Operator Pos Before Newline Position operators at line end or line start when wrapping
Indent Empty Lines False Keep indentation on blank lines to preserve structure in diffs

Why use this JavaScript beautifier and formatter

A consistent formatter reduces cognitive load when reading code and keeps diffs clean in version control. Use this JS formatter to enforce project style, speed up code reviews, and make automated formatting part of your build and CI process. This tool works as a quick JS prettify online helper and as a reliable code formatter for teams.

Best practices and standards

  • Follow a single style guide for a project to avoid churn
  • Use the formatter in pre commit hooks so code enters the repo already formatted
  • Document which settings are in use, for example indent size and brace style
  • For shared projects prefer spaces or tabs consistently across files
  • Run automated tests or linters after formatting to catch style dependent issues

Conclusion

This JavaScript beautifier and formatter is designed to make code clearer and easier to maintain. It supports a wide set of options so you can match project standards or personal preference. Use it to beautify or format JS code instantly without any headache or setup.