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Code Formatter

A multi-language prettifier powered by Prettier and sql-formatter. Pick a language, tune print width and indentation, and get consistently formatted code in one click.

  • Runs in your browser
  • Free, no sign-up
  • No uploads

Input

0 chars0 lines0 B

Output

 

The Importance of Code Formatting

When writing software, the computer only cares that the syntax is mathematically correct. It doesn't care if your entire application is written on a single line of text. However, software is rarely written by a single person, and it is almost never written and abandoned.

Code is read by humans far more often than it is written. Therefore, code formatting is critical for maintaining a readable, maintainable, and scalable codebase.

A Code Formatter (like Prettier) takes messy, inconsistent code and automatically restructures it according to strict, predefined stylistic rules.

Why Use an Automated Formatter?

In the past, development teams would spend hours arguing in code reviews over trivial stylistic choices: tabs vs. spaces, single quotes vs. double quotes, or whether the curly brace belongs on the same line as the function declaration.

An automated code formatter solves this by completely removing human preference from the equation.

  1. Consistency: Every file in your project looks exactly the same, regardless of whether a senior architect or a junior intern wrote it.
  2. Speed: Developers no longer have to waste time manually aligning variables or fixing indentation. They write the logic, press format, and the tool does the rest.
  3. Fewer Bugs: By enforcing a strict visual structure, missing brackets and syntax errors become instantly obvious to the naked eye.

Supported Languages

Our Code Formatter supports multiple languages through a universal formatting engine:

  • JavaScript & TypeScript: Enforces modern ECMAScript standards.
  • HTML & CSS: Aligns nested DOM elements and standardizes stylesheet properties.
  • JSON: Beautifies massive API payloads into readable tree structures.
  • Markdown: Standardizes table alignments and list spacing.

Client-Side Formatting for Security

If you are working on proprietary source code, uploading your raw logic to a random online formatter is a massive security risk. You could accidentally leak API keys, proprietary algorithms, or confidential business logic.

Our universal Code Formatter runs 100% inside your web browser. We use WebAssembly to port industry-standard parsers directly to your device. This means your confidential source code is formatted instantly on your local CPU and is never transmitted over the internet.

How to use the Code Formatter

  1. 1

    Select the language of your code from the dropdown.

  2. 2

    Paste your code or drop a source file into the editor.

  3. 3

    Adjust indentation, quotes or print width, then press Format.

Features

12+ languages
TypeScript, JavaScript, JSX, JSON, HTML, Vue, CSS, SCSS, Less, YAML, Markdown, GraphQL and SQL.
Prettier under the hood
The same formatter used by millions of projects, running in your browser.
Configurable
Control tab width, tabs vs spaces, semicolons, quotes and print width.
Lazy loaded
Language parsers load on demand, keeping the page fast.

Frequently asked questions

Which formatter does this tool use?

It uses Prettier's standalone build for most languages and sql-formatter for SQL dialects.

Why did formatting fail?

Prettier needs syntactically valid code. The error message shows the line and column where parsing stopped.

Are my code snippets uploaded to a server?

No. All processing happens locally in your browser using JavaScript and WebAssembly. Your code snippets never leave your device, and nothing is stored or logged.