Prettier Code Formatter

Format your code with opinionated styling using Prettier. This tool formats JavaScript, TypeScript, CSS, HTML, JSON and more with consistent code styling, making your code more readable and maintainable.

Drop Code File Here

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Input Code

Formatted Code

Prettier Options

Tab Width

Number of spaces per indentation level

Print Width

Line length where Prettier will try to wrap

Indentation

Use tabs or spaces for indentation

Quote Style

Use single or double quotes

Trailing Commas

Print trailing commas where possible

Bracket Spacing

Print spaces between brackets

Add Semicolons

Add semicolons at the end of statements

JSX Single Quotes

Use single quotes in JSX

Formatting Stats

0 B

Original Size

0 B

Formatted Size

Lines of Code

0 ms

Process Time

See Prettier Formatting in Action

                                
                                Before formatting:
                            
function helloWorld(    ){const message='Hello, world!';for(let i=0;i<5;i++)
{console.log(message);}
return {
status:"complete",count:5}}
Hard to read: 143 characters (3 lines)

                                
                                After formatting with Prettier:
                            
function helloWorld() {
  const message = 'Hello, world!';
  for (let i = 0; i < 5; i++) {
    console.log(message);
  }
  return {
    status: 'complete',
    count: 5,
  };
}
Clean formatting: 174 characters (9 lines)

Popular Use Cases for Prettier Code Formatter

Pre-Commit Formatting

Quickly format code before committing to version control to ensure consistent code style across your team's codebase without the need to configure local Prettier installations.

Legacy Code Cleanup

Transform old, inconsistently formatted code into clean, modern syntax with consistent spacing, indentation, and structure to improve maintainability.

Team Collaboration

Establish a standard code style across development teams to reduce friction during code reviews and make codebases more consistent regardless of who wrote the code.

Learning Best Practices

Learn proper code formatting standards by seeing how Prettier restructures your code according to industry best practices and modern syntax conventions.

How Our Prettier Formatter Compares

Feature	Prettier Formatter Pro	Prettier Playground	ESLint Formatters	Code Beautifiers
Free to Use	✓	✓	✓	✓
No Installation Required	✓	✓	✗	✓
Client-Side Processing	✓	✓	✗	✓
Multiple Language Support	✓	✓	✗	✗
Custom Configuration	✓	✓	✓	✗
File Download	✓	✗	✗	✓
Sample Code Examples	✓	✗	✗	✗
File Size Limit	10 MB	1 MB	Varies	5 MB
Opinionated Styling	✓	✓	✗	✗
Error Detection	✓	✓	✓	✗

How to Format Code with Prettier

Select your language and paste code

Choose your programming language from the tabs above, then enter your code directly into the editor or drag and drop your file to upload it.

Configure formatting options

Customize Prettier's formatting behavior by adjusting tab width, quote style, line width, and other options to match your project's coding standards.

Click "Format Code"

Process your code with one click to apply Prettier's opinionated formatting rules for consistent, clean code structure.

Copy or download the result

Copy the formatted code to your clipboard or download it as a file for immediate use in your development projects.

What Users Say About Our Prettier Formatter

Michael Chen

Senior Frontend Developer

★★★★★

This Prettier formatter is an essential part of my development workflow. It works perfectly for multiple languages and saves me from configuring Prettier locally for small projects or quick code edits.

Sarah Johnson

Full Stack Developer

★★★★★

I use this tool daily to ensure code consistency across my team. The ability to format multiple languages with the same tool is a huge time-saver, and the customization options let us match our project standards perfectly.

James Wilson

Web Development Instructor

★★★★★

I recommend this Prettier formatter to all my students. It helps them understand code formatting best practices and produces consistent results every time. The before/after examples are particularly helpful for learning.

Frequently Asked Questions About Prettier Code Formatter

What is Prettier and how does it format code?

Prettier is an opinionated code formatter that enforces a consistent style by parsing your code and reprinting it with its own rules. Unlike other formatters or linters that focus on style rules, Prettier takes a different approach by completely parsing and reprinting the code with standardized formatting.

The key benefits of Prettier's approach include:

Consistent code style across your entire codebase
Automatic formatting that requires minimal configuration
Support for multiple languages with the same formatting principles
Elimination of debates over code style in teams

Which programming languages does this formatter support?

Our Prettier formatter supports multiple languages including:

JavaScript (including ES6+ features)
TypeScript
CSS, SCSS, and Less
HTML
JSON
JSX and React code

The formatter automatically detects the language based on your selection and applies the appropriate Prettier parser and formatting rules.

Will formatting with Prettier change my code's functionality?

No, Prettier is designed to only change the formatting of your code, not its functionality. It preserves the semantic meaning of your code while adjusting whitespace, line breaks, indentation, and other stylistic elements.

In extremely rare cases where code relies on ASI (Automatic Semicolon Insertion) in JavaScript, adding semicolons might change behavior, but this is uncommon in well-written code. Prettier is widely used in production environments and trusted to maintain code functionality while improving readability.

Can I customize Prettier's formatting rules?

Yes, our Prettier formatter provides several customization options, including:

Tab Width - Set the number of spaces per indentation level (2, 4, or 8)
Print Width - Specify the line length where Prettier will try to wrap
Quotes - Choose between single or double quotes
Semicolons - Decide whether to add semicolons at the end of statements
Trailing Commas - Control trailing comma behavior in arrays and objects
Bracket Spacing - Format spaces inside object literals

While Prettier is opinionated by design and has fewer configuration options than some other formatters, these customizations allow you to adapt the output to match your team's coding standards.

Is my code secure when using this online formatter?

Yes, your code is completely secure. Our Prettier formatter processes all code entirely in your browser (client-side), meaning your code never reaches our servers. The tool uses the Prettier library loaded directly in your browser to perform all formatting operations locally on your machine.

This approach ensures maximum privacy and security for your intellectual property and sensitive code. We don't store, track, or have access to any code you format using this tool.

How does this compare to using Prettier in my development environment?

Our online Prettier formatter offers several advantages compared to local installation:

No Setup Required - Use immediately without installing dependencies or configuring your project
Multi-language Support - Format various languages without installing separate parsers
Quick Access - Perfect for one-off formatting tasks or when working on machines where you can't install software
Instant Results - See formatted code side-by-side with your original code

For continuous development work, integrating Prettier with your IDE and build process provides automatic formatting and is recommended for long-term projects. Our online tool is ideal for quick formatting tasks, learning Prettier's behavior, or formatting code when you don't have your development environment available.

About Prettier Code Formatting

Prettier is an opinionated code formatter that supports multiple languages and has minimal configuration options. It was created to end debates about code style by providing a consistent, automated approach to formatting.

Benefits of Consistent Code Formatting

Using a code formatter like Prettier offers numerous advantages to both individual developers and teams:

Improved Readability: Consistent formatting makes code easier to scan and understand.
Higher Productivity: Developers spend less time manually formatting code and more time solving problems.
Better Collaboration: Standardized code style reduces friction during code reviews and when working on shared codebases.
Fewer Errors: Proper formatting can expose structural issues that might otherwise be hidden in messy code.
Easier Onboarding: New team members can quickly adapt to the codebase's consistent style.
Focused Discussions: Code reviews focus on functionality rather than style preferences.

Prettier's Formatting Philosophy

Prettier takes a unique approach to code formatting with several key principles:

Maximum Line Length: Code is wrapped at a configured line length to improve readability.
Fewer Configuration Options: Deliberately limited options to reduce debates about formatting details.
Whitespace Sensitivity: Maintains proper indentation and spacing to clarify code structure.
Consistent Multi-line Formatting: Applies consistent rules for breaking expressions across multiple lines.
Special Handling for Edge Cases: Applies special rules to improve readability in complex expressions.
Parser-Based Approach: Uses language parsers to understand code structure rather than relying on regular expressions.

Integrating Prettier Into Your Workflow

While our online formatter is useful for quick tasks, here are some tips for integrating Prettier into your development workflow:

Editor Integration: Install Prettier plugins for your code editor to format on save.
Pre-commit Hooks: Use tools like husky and lint-staged to automatically format code before commits.
CI/CD Pipeline: Add Prettier checks to your continuous integration process to ensure all code meets your style standards.
Shared Configuration: Use a .prettierrc file in your project to share formatting rules with all contributors.
Format Entire Codebases: Run Prettier against your entire codebase when first adopting it to establish a consistent baseline.

When to Format Your Code

Consider formatting your code in these common scenarios:

Before committing code to version control
When reviewing pull requests
After merging code from different developers
When taking over legacy codebases
Before sharing code examples or snippets
During code reviews to focus on functionality rather than style
When teaching or learning programming to establish good formatting habits