Code Formatter & Beautifier
Format JavaScript, TypeScript, JSON, HTML, and CSS in your browser.
Runs entirely in your browser — source is never uploaded. Language and indent settings stay on this device; your code is not stored.
Online Code Formatter & Beautifier
Looking for an online code formatter or code beautifier? Toolshelf formats JavaScript, TypeScript, JSON, HTML, and CSS in your browser — no install and no signup. Paste messy or minified source, choose the language, then click Format to pretty-print it. Use Minify when you need compact JSON or CSS.
Formatting (also called beautifying or pretty-printing) rewrites indentation, wrapping, and spacing so the structure of the code is visible. It does not compile, execute, or change program behavior. A JavaScript formatter, TypeScript formatter, HTML formatter, and CSS formatter all live on this one page so you do not need a separate tool for each language.
What this code formatter does
- Format and beautify JavaScript, TypeScript, JSON, HTML, and CSS in one page
- Reliable JavaScript and TypeScript formatting for everyday syntax
- HTML formatting that respects nested tags, attributes, comments, and inline elements
- CSS formatting for selectors, declarations, and nested rules
- JSON pretty-print and minify with native parsing
- Indent with 2 spaces, 4 spaces, or tabs, plus optional line wrapping
- Copy, paste, download, or load a local file — nothing is uploaded
- Useful syntax errors with line and column when the parser reports them
Supported languages
The editor is built around language adapters. Each language has its own formatter. New languages can be added later without turning this page into a set of near-duplicate tools.
JavaScript formatter
Formats modern JavaScript, including arrow functions, template literals, modules, and JSX-style tags. The tool uses a dedicated formatter instead of a hand-rolled pretty printer, so common syntax is handled consistently.
TypeScript formatter
Beautifies TypeScript types, interfaces, generics, and regular TypeScript/JavaScript statements so mixed .ts and .tsx snippets stay readable.
HTML formatter
Indents nested tags, keeps attributes on the opening tag when they fit, preserves comments, and treats inline elements such as strong, em, and span according to normal HTML whitespace rules.
CSS formatter
Formats selectors, declarations, at-rules, and nested rules where the CSS parser supports them. Minify is available after the stylesheet parses successfully.
JSON formatter
Uses native JSON.parse and JSON.stringify for a quick pretty-print. For tree view, key sorting, and JSON-only validation, use the dedicated JSON Formatter & Minifier — that page is the primary JSON tool.
How to use the online code formatter
- Select JavaScript, TypeScript, JSON, HTML, or CSS.
- Paste source, use Paste, or drop a local file onto the Input panel.
- Choose 2-space, 4-space, or tab indent. Toggle line wrap if you want long lines broken near 80 columns.
- Click Format to beautify, or Minify for JSON and CSS.
- Copy the output or download it. Click Clear to reset both panels.
When to use this tool
Clean up copied snippets
Paste minified JavaScript from a bundle, a one-line HTML fragment, or compact CSS and turn it into readable code before you debug it.
Review API and config JSON
Pretty-print JSON payloads, then switch to the dedicated JSON Formatter when you need tree view, key sorting, or validation extras.
Prepare HTML and CSS for reading
Beautify nested markup, attributes, and comments, or format stylesheets so selectors and declarations are easy to scan.
Share TypeScript examples
Format interfaces, generics, and everyday TypeScript so examples in tickets, docs, and pull requests stay consistent.
Shrink JSON or CSS when size matters
Minify JSON with native stringify, or compact CSS by removing comments and extra whitespace after the syntax checks out.
Work offline after the page loads
Formatting runs in your browser. After the page is loaded, you can keep formatting snippets without sending them to a server.
Limitations
- Source must be valid enough to parse. The tool reports syntax errors; it does not guess a repair.
- Files larger than 2 MB are rejected so the tab stays responsive.
- JavaScript, TypeScript, and HTML are not minified here. Use a dedicated minifier in your build pipeline when you need that.
- Formatting is not a linter, compiler, or security scanner. It does not execute the code you paste.
Frequently asked questions
- What is a code formatter?
- A code formatter rewrites source so indentation, line breaks, and spacing follow consistent rules. It does not change what the code means. The result is easier to read, review, and diff. This online code formatter does that in your browser for JavaScript, TypeScript, JSON, HTML, and CSS.
- What does beautifying code mean?
- Beautifying (or pretty-printing) is the same idea as formatting: take compact or messy source and make the structure visible with indentation and wrapping. A code beautifier is a formatter that emphasizes readability. This page is both a code formatter and a code beautifier.
- What is the difference between formatting and minifying?
- Formatting adds indentation and line breaks for people. Minifying removes comments and extra whitespace to shrink size for machines. This tool formats every supported language. Minify is limited to JSON and CSS, where compacting can be done safely without a separate compiler-style minifier.
- Is this a JavaScript formatter, an HTML formatter, and a CSS formatter?
- Yes. One page covers JavaScript, TypeScript, JSON, HTML, and CSS. Choose the language, paste source, and click Format. Separate language pages are not required — the same editor is an online JavaScript formatter, TypeScript formatter, HTML formatter, and CSS formatter.
- Does my code leave the browser?
- No. Formatting, minifying, copy, paste, and download run locally. If you upload a file, the browser reads it on your device. Language and indent preferences can stay in localStorage. Your source is not stored and is not uploaded to Toolshelf servers.
- How do I format JavaScript or TypeScript online?
- Select JavaScript or TypeScript, paste the snippet or drop a .js / .ts file, set indent and line wrap, then click Format. Copy or download the result. Syntax mistakes show a message with a line and column when the parser reports them.
- How do I format HTML or CSS online?
- Choose HTML or CSS, paste the markup or stylesheet, then click Format. Nested tags, attributes, comments, selectors, and declarations are indented. CSS can also be minified after it parses.
- Why is minify disabled for JavaScript, TypeScript, and HTML?
- Safe JS/TS minify needs a dedicated minifier that understands the language and will not break semantics. HTML minify can damage whitespace-sensitive content such as pre, textarea, or inline text. Those languages stay format-only here. JSON and CSS minify only after a successful parse.
- Can I format large files?
- Yes for typical source files. The limit is 2 MB so a huge paste does not freeze the tab. Formatting runs off the main thread when the browser allows a worker. Extremely large files may still be limited by device memory.
- Do I need an account to use this online code formatter?
- No. Toolshelf Code Formatter & Beautifier requires no account and has no usage cap. Processing stays on your device.
- Does this replace an editor formatter?
- It is a fast browser tool for snippets, reviews, and files you do not want to open in an IDE. Project-wide format-on-save still belongs in your editor or CI. This page is the online version for quick work.
Related tools
Continue with related browser-based tools on Toolshelf.
- SQL Formatter & Beautifier — Online SQL formatter and beautifier.
- JSON Formatter & Minifier — JSON formatter online: beautify, minify, and validate JSON in your browser.
- Markdown Editor & Preview — Online Markdown editor with live preview.
- Text Compare — Online text compare and diff checker.
- JSON to CSV Converter — Online JSON to CSV converter.
- JWT Decoder & Inspector — Online JWT decoder and inspector.
- Hash Generator — Online hash generator.
- Chmod Calculator — Chmod calculator online.
Ready to format or beautify your code?
Scroll up to the editor, paste a snippet, and format it in your browser.
Back to editorUse cases
- For Developers — Format JSON, test regex, decode JWTs, and work with timestamps.
What would you like to do next?
Continue working with the next step in this workflow. Recently used tools in this set are listed first.
- Regex Tester — Online Regex Tester and Debugger.
- SQL Formatter & Beautifier — Online SQL formatter and beautifier.
- JSON Formatter & Minifier — JSON formatter online: beautify, minify, and validate JSON in your browser.
- Markdown Editor & Preview — Online Markdown editor with live preview.
You may also need
Continue with related browser-based tools on Toolshelf.
- SQL Formatter & Beautifier — Online SQL formatter and beautifier.
- JSON Formatter & Minifier — JSON formatter online: beautify, minify, and validate JSON in your browser.
- Markdown Editor & Preview — Online Markdown editor with live preview.
- Text Compare — Online text compare and diff checker.
- JSON to CSV Converter — Online JSON to CSV converter.
- JWT Decoder & Inspector — Online JWT decoder and inspector.
- Hash Generator — Online hash generator.
- Chmod Calculator — Chmod calculator online.
Next steps
Related workflows on Toolshelf. These are curated paths, not usage rankings.
- Developer workflow — Format JSON, convert it to CSV, then inspect tokens.