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Minified or single-line JavaScript is efficient to ship but hard to read — this tool re-indents it based on bracket nesting so the structure is visible again.
This tool formats JavaScript by tracking bracket depth and breaking statements onto their own lines.
How it works
Paste your JavaScript. The tool tracks the depth of curly braces, parentheses, and square brackets, indenting one level deeper each time it enters a bracket and back out each time it exits — string contents are left untouched so brackets inside strings don't affect indentation.
- Enter javaScript input.
- Click Calculate to see your results.
Examples
Formatting a one-liner
function add(a,b){return a+b;} becomes a properly indented multi-line function.
Who should use it
- Making minified or copy-pasted JavaScript readable again for debugging.
- Quickly inspecting a third-party script before deciding whether to use it.
Industry applications
- Web development
- Front-end debugging and code review
Advantages
- Instantly turns minified JavaScript into a readable, indented structure.
- Leaves string contents untouched so quotes and brackets inside strings aren't affected.
Limitations
- A simple bracket-depth indenter, not a full JavaScript parser — unusual syntax may not format perfectly.
Common mistakes to avoid
- Expecting perfect formatting on advanced syntax like regular expression literals or nested template strings — this is a simple indenter, not a full parser.
- Using this as a substitute for a proper linter — it reformats indentation but doesn't catch syntax or logic errors.
Best practices
- Use this for a quick readability pass on minified or copy-pasted JavaScript — for production-grade formatting with full edge-case handling, a dedicated tool like Prettier is more thorough.
Tips
- If a snippet doesn't format quite right, try formatting a smaller section at a time — isolating the section makes it easier to spot which bracket is throwing off the indentation.