JavaScript Formatter

About the JavaScript Formatter Tool

Improve the readability and consistency of your JavaScript code with our easy-to-use online JS Formatter and Beautifier. Paste your JS code or upload a file, select your preferred indentation style, and instantly get clean, well-structured code.

Why Format JavaScript?

Cleanly formatted JavaScript is essential for writing maintainable and collaborative code:

• Easier Reading & Understanding: Proper indentation and spacing clarify code blocks, logic flow, and function scopes.
• Faster Debugging: Consistent formatting makes syntax errors, scope issues, or misplaced brackets easier to spot.
• Improved Teamwork: Standardized code style allows developers to understand and contribute to each other's code more effectively.
• Code Maintainability: Well-formatted code is simpler to revisit, update, and refactor over time.

How to Use This Tool

• Paste your JavaScript code into the input editor on the left.
• Alternatively, click "Open JS File..." to upload a .js file from your computer.
• Select your desired indentation (2, 4, 6, 8 Spaces, or Tab) from the dropdown menu.
• Click the "Format JavaScript" button.
• The beautified JavaScript code will appear in the output editor on the right.
• If your code contains significant syntax errors, the formatter might fail and display an error message.
• Use the "Copy JS" or "Download JS" buttons to save the formatted output.

This tool utilizes the powerful Prettier library directly in your browser, applying widely accepted formatting standards while ensuring your code remains private and secure on your device.

Frequently Asked Questions

What does a JavaScript Formatter do?

A JavaScript Formatter (or Beautifier) takes JavaScript code, regardless of its initial spacing or indentation, and automatically rewrites it to follow consistent style rules. This involves adjusting indentation, line breaks, spacing around operators, and other stylistic elements to make the code neat and easy to read without changing its functionality.

Is my JavaScript code safe? Is it sent to a server?

Yes, your code is safe. This tool performs all formatting directly in your web browser using JavaScript libraries (CodeMirror and Prettier). Your code is never uploaded to our server, maintaining your privacy and the confidentiality of your code.

Can I choose the indentation style?

Yes, you can select your preferred indentation using the "Indentation" dropdown. Options include 2, 4, 6, or 8 spaces, or using tab characters.

Does this tool check for errors or bugs in my JavaScript?

No, this is primarily a code formatter, not a linter or debugger. While the formatting process might fail or highlight obvious syntax errors (like a missing bracket), it will not find logical errors, runtime bugs, or potential code quality issues. Its goal is to make syntactically valid code look clean and consistent.