100% In-Browser Privacy

JavaScript Formatter & Beautifier

PopularDeveloper Tools

Format, beautify, indent, and validate JavaScript (ES6+) and TypeScript code with customizable formatting rules and syntax validation.

100% In-Browser Privacy

Zero Server Uploads

Indent:

Input Code

Formatted Output

function calculateMetrics(data,options= {
}
) {
  const total=data.reduce((acc,curr)=>acc+curr.value,0);
  const average=total/data.length;
  if(options.debug) {
    console.log( {
      total,average
    }
    );
  }
  return {
    total,average,count:data.length
  }
  ;
}

Who Is JavaScript Formatter & Beautifier Built For?

Developers de-minifying production bundle scripts for reverse engineering and debugging

Students and engineers formatting messy JavaScript snippets before code reviews

Webmasters inspecting obfuscated or minified third-party scripts for security audits

Key Benefits & Core Capabilities

Full Modern ES6+ & TypeScript Support

Formats async/await, arrow functions, destructuring, optional chaining, and TypeScript types.

Beautify & Indent Options

Configure 2-space, 4-space, or tab indentation with customizable brace styles.

Instant Syntax Validation

Detects unclosed brackets, syntax errors, and invalid tokens with exact line numbers.

100% Client-Side Privacy

Format sensitive proprietary business logic safely in your local browser sandbox.

Step-by-Step Guide: How to Use JavaScript Formatter & Beautifier

1
Paste JS CodePaste minified or compressed JavaScript code.
2
FormatClick Beautify JavaScript to format indentation.
3
Copy ResultCopy the clean JavaScript to your clipboard.

How It Works & Technical Architecture

The JavaScript Formatter uses an optimized AST-based ECMAScript parser running directly in browser memory.

It parses modern JavaScript and TypeScript code into abstract syntax trees, reconstructing the code with standardized indentation, whitespace, and semicolon conventions.

Because processing executes entirely in your browser sandbox, your proprietary code and algorithms remain 100% confidential.

Practical Use Cases & Applications

De-minifying Production JS Bundles

Un-minify webpack and Vite bundle chunks to debug stack traces and inspect script logic.

Standardizing Code Snippets

Clean unformatted code snippets copied from StackOverflow, blogs, or Slack.

Security Script Audits

Beautify obfuscated scripts to audit third-party analytics and tracking tags.

Preparing Code for Pull Requests

Format JavaScript files according to standard Prettier/Airbnb conventions before merging.

Supported Formats & Input Options

JavaScript (ES5, ES6, ES2022+)TypeScript (.ts)JSX / TSX syntax

Frequently Asked Questions

Can this tool format TypeScript and JSX code?

Yes. Softnag fully supports modern TypeScript type annotations, JSX/TSX syntax, and modern ES2022+ language features.

Does formatting minified code restore original variable names?

Formatting reconstructs clean indentation, line breaks, and bracket hierarchy, but short minified variable names (like a, b, c) cannot be automatically renamed to their original names.

Is my proprietary source code uploaded to any cloud server?

Never. All parsing and formatting occur 100% locally in your browser.

How does the tool notify me of syntax errors?

If your JavaScript contains invalid syntax, Softnag highlights the exact line and character position with a detailed error message.

Can I copy the formatted code with one click?

Yes. You can copy the formatted code to your clipboard or download it as a .js file.

Does formatting execute my JavaScript code?

No. The code is only parsed as text tokens; no execution or eval() is ever performed.