Javascript Pretty Print

Pretty print JavaScript code with standardized indentation and spacing.

100% Client-Side Local Execution

Upload Data

1

const obj={a:1,b:2};if(obj.a===1){alert("yes");}

const obj={a:1,b:2};if(obj.a===1){alert("yes");}

const obj= {
  a:1,b:2
};
if(obj.a===1) {
  alert("yes");
}

const obj= {
  a:1,b:2
};
if(obj.a===1) {
  alert("yes");
}

What is Javascript Pretty Print?

This javascript pretty print tool reformats compact or inconsistently indented JavaScript into a clean, readable layout, making it quicker to scan logic, spot bracket mismatches, or review a snippet pasted from somewhere else. It applies the same whitespace-and-indentation rules developers expect from a code formatter. A fast way to pretty print js directly in your browser.

Technical Execution

The tool tokenizes your JavaScript source, identifying statements, blocks, and expressions, then re-renders that structure with consistent indentation and line breaks after each statement and block boundary. It only adjusts formatting, never touching the actual logic, variable names, or execution order of your code.

Zero Data Storage Guarantee

Pasted JavaScript snippets can contain proprietary logic or internal API calls you don't want leaving your machine. This tool formats everything locally in your browser's JavaScript engine, so your code is never uploaded or stored.

How to Use Javascript Pretty Print (Step-by-Step Guide)

Paste your JavaScript code into the input panel
The tool automatically re-indents and formats the code
Review the pretty-printed output
Adjust indentation width if the tool offers that setting
Copy the formatted code for use elsewhere

Frequently Asked Questions (FAQ)

Q: How is javascript pretty print different from the js-beautifier tool on this site?

A: They apply very similar formatting logic; pretty print is framed around quick readability for review, while the beautifier tool is framed around full reformatting of minified or messy production code — both leave logic untouched.

Q: Is this js pretty print online tool free?

A: Yes, free to use with no account needed.

Q: Does it change variable names or logic?

A: No, only whitespace, indentation, and line breaks are adjusted — the code behaves identically after formatting.

Q: Can I format javascript code that has a syntax error?

A: No, the tool needs to parse valid JavaScript to understand its structure; a syntax error will typically produce an error message instead of formatted output.

Q: Does it support modern ES6+ syntax?

A: Yes, arrow functions, template literals, destructuring, and async/await are all handled correctly.

Q: Can I use this to pretty print js pulled from a minified bundle?

A: Yes, minified code with no line breaks is a common input — the tool reconstructs readable indentation and line breaks from it.

Q: Is there a size limit on the input?

A: Very large files may process more slowly since formatting happens in your browser tab, but typical scripts and functions format instantly.

Q: Will it preserve my comments?

A: Yes, comments in the original code are generally preserved and repositioned appropriately within the formatted output.

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