JavaScript

JavaScript Beautifier

Tidy JavaScript with indentation, wrapping, and spacing options.

Format options

Choose indentation, line wrapping, and whitespace cleanup preferences.

Indentation style

Pick spaces or tabs; choose 2, 4, or 8-space indentation.

Line wrapping

Wrap long lines for readability; pick presets or set a custom width.

Normalize indentation

Trim inconsistent leading whitespace while keeping block structure.

Fix incorrect blocks

Dedent closing braces and indent after opening braces or cases.

Remove trailing spaces

Strip whitespace at line ends before formatting.

Limit blank lines

Collapse repeated blank lines to the chosen maximum.

max in a row

Bracket-aware wrapping

Prefer breaks at commas or brackets when wrapping long lines.

Bracket continuation indent

Indent wrapped lines further when inside parentheses or brackets.

Normalize operator spacing

Insert consistent spaces around math/comparison operators.

JavaScript code input

Paste or type JS/TS snippets to realign indentation and wraps.

Handles braces, template strings, comments, and simple JSX.

Formatted output

Review and copy the beautified JavaScript.

Use Select all or Copy to move the result into your editor.

What

JavaScript Beautifier definition

A JavaScript formatter prettifies JS/TS code into a readable, consistent layout.

Cases

Use Cases

Format minified code for debugging

Clean up snippets before review

Standardize indentation and spacing

How To

How to Format JavaScript Code

A step-by-step guide to formatting JS/TS code for readability.

Paste code

Paste your JavaScript/TypeScript snippet into the input.

Select options

Choose indentation, wrapping, and whitespace rules.

Format and copy

Run formatting and copy the output.

Knowledge

Understanding JavaScript Code Style

JavaScript Style Guides

Popular style guides include Airbnb, Google, and StandardJS. They define rules for indentation, semicolons, quotes, naming conventions, and more. Consistency matters more than which specific style you choose.

Semicolon Debate

JavaScript has automatic semicolon insertion (ASI). Some styles omit semicolons (StandardJS), others require them (Airbnb). Both work—pick one and be consistent. Formatters like Prettier can enforce your choice.

ES6+ Features

Modern JavaScript offers arrow functions, template literals, destructuring, spread operators, and more. These features often make code more concise and readable. Formatters handle these newer syntax features.

Formatting Tools

Prettier is the most popular opinionated formatter—it makes all style decisions for you. ESLint can also format but focuses more on catching bugs. Many projects use both: Prettier for formatting, ESLint for linting.

TypeScript Considerations

TypeScript adds type annotations to JavaScript. Formatters preserve type syntax while formatting. Type-aware linting (with typescript-eslint) can catch type-related style issues and potential bugs.

FAQ

JavaScript beautifier FAQ

What indentation widths are supported?

Use tabs or 2/4/8-space indentation. The tool re-indents braces and switch cases when enabled.

Does it work with template strings or JSX?

Template literals are preserved and simple JSX tags keep their spacing; complex JSX isn't parsed.

How does line wrapping work?

Long lines wrap at commas or spaces up to the chosen width, adding continuation indents for readability.

Can I remove extra blank lines?

Enable 'Limit blank lines' and set how many consecutive empty lines are allowed.

What's the origin of JavaScript?

JavaScript was created by Brendan Eich in 1995 for Netscape Navigator and evolved into the ubiquitous language of the web.

How popular is JavaScript now?

JavaScript routinely tops language rankings and GitHub repos thanks to web dominance, Node.js, and frontend frameworks.

Where is JS formatting most helpful?

Keeping React/Vue components, API handlers, and shared libraries consistent across editors and CI pipelines.

Any maintenance tips for JS code style?

Adopt a formatter plus lint rules, avoid mixing tabs/spaces, and run formatting pre-commit to prevent drift across teams.

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