ToolzyLab
Auto-indent and prettify ugly JavaScript or JSON, validate syntax, clean spacing, minify output, inspect stats, and export polished code instantly in your browser with zero uploads.
Paste raw code, upload a file, beautify messy JavaScript, prettify JSON, validate syntax, normalize indentation, and export clean production-ready code in a pro ToolzyLab layout.
Paste code, upload a .js or .json file, or drag and drop code here to format instantly.
📄 .js / .json · ⚡ instant format · ✅ validation · 📉 minify · 🔒 no uploadWrite or paste raw code on the left, then inspect the beautified result on the right.
1
1
See syntax status, parser details, and line-specific issues after validation or formatting.
Use beautify mode while debugging or reviewing code. Use minify mode for compact output. JSON mode gives strict formatting, while JavaScript mode preserves comments and modern syntax more naturally.
Quick stats for the current output so you can scan size, complexity, and structure fast.
It auto-detects JSON or JavaScript, validates syntax, formats indentation cleanly, highlights output, counts useful code stats, supports file upload, and lets you copy or download the result in one polished screen.
JavaScript formatting can expose structure and produce consistent source, but it cannot establish correctness or safely replace a project build. Choose parser mode, indentation, quote preference, trailing commas, semicolons, and search, then validate and diff the result before running it in the intended runtime.
JSON requires double-quoted keys and strings and does not allow comments, functions, undefined, or trailing commas. JavaScript modules, scripts, and newer syntax also differ by runtime. Select the actual input type and target environment before treating a successful parse as meaningful.
A capable formatter protects token boundaries, but minified or transformed code still needs tests. Comments may carry licenses, source-map hints, bundler instructions, or coverage directives. Quote changes can affect escaping, and trailing-comma policy can affect older targets. Review the diff rather than trusting appearance.
Use the repository's configured Prettier, ESLint, compiler, bundler, and minifier for shipped code. Those tools know parser versions, module targets, transpilation, tree shaking, and source maps. Never execute untrusted JavaScript merely to see whether it works.
Validate syntax and behavior in the real target environment before replacing project code.
Many JSON values resemble JavaScript literals, but the grammars differ. JSON has stricter quoting and excludes comments, functions, undefined, and other JavaScript constructs.
Automatic semicolon insertion has edge cases at certain token boundaries. Use a parser-aware formatter and run tests rather than deleting punctuation mechanically.
A formatter should re-escape content, but template literals, embedded code, JSON, and project lint rules deserve review. Compare the resulting value, not only the delimiter.
Some comments contain licenses, build directives, source-map references, or tooling controls. A production minifier should apply the project's preservation policy.
No. Syntax validity says nothing about malicious behavior, logic errors, dependencies, permissions, or runtime compatibility. Do not execute untrusted code.
Project tooling pins parser versions and integrates lint rules, types, build targets, source maps, and tests, producing repeatable changes across the codebase.