JavaScript Formatter
Format and beautify unindented or minified JavaScript (ES6+) code with standardized 2-space indentation, clean spacing, and structural alignment.
Quick Answer & Understanding Your Result
A JavaScript Formatter beautifies and standardizes unorganized, single-line, or minified JavaScript (ES6+) code into clean, 2-space indented blocks.
Core JavaScript Formatting Capabilities
- Standardized 2-Space Indentation: Formats functions, arrow functions, control flow statements (
if/else,for,while), and classes with consistent hierarchy. - Modern ES6+ Syntax Support: Seamlessly formats async/await, optional chaining (
?.), nullish coalescing (??), destructuring, and template literals. - Brace & Operator Spacing: Standardizes spacing around binary operators (
+,===,&&) and object curly braces.
Development Applications
- Code Inspection & Debugging: Un-minifying third-party JavaScript vendor bundles for auditing.
- Codebase Standardization: Bringing unformatted legacy scripts into modern clean coding conventions.
Paste your unformatted JavaScript code above to format and prettify your script instantly.
Formula & Calculation Logic
Technical Specification & ASTAST formatting pipeline:
- Parses JavaScript tokens into an AST and formats code with standardized 2-space indentation.
Step-by-Step Guide
Paste JavaScript Code
Paste minified or unindented JS code into the editor.
Deterministic AST Formatting
The engine recalculates block indentation depths in 0ms.
Copy Beautified Code
Copy clean JavaScript code or export as a .js file.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Minified Function to Formatted | Expanded single-line function into clean multi-line block. | ||
| React Functional Component | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
ECMA-262 ECMAScript Language Specification
Prettier - Opinionated JavaScript Code Formatter
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Prettified JS = js_beautify(input, indent_size: 2, space_after_anon_function: true )
Last Reviewed: August 21, 2026
Primary Source: ECMA-262 ECMAScript Language Specification
Reference Document: Prettier - Opinionated JavaScript Code Formatter
Computation Privacy: 100% client-side 0ms computation, zero data retention
All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.