Beautify and format JSON, JavaScript, CSS, HTML, and SQL. 100% browser-based — no server uploads.
Pick the language first so the formatter knows which syntax rules to apply. Paste a minified bundle, an API response, or a rough snippet into the input pane and the formatted result appears instantly on the right. You can also switch the indentation style before copying the cleaned code back into your project.
If you need a compressed version instead of a readable one, enable Minify. That is useful for JSON responses or shipping production assets where whitespace does not matter.
Developers use code beautifiers to clean up JSON payloads, reformat copied JavaScript snippets, make CSS rules easier to read, and prepare HTML templates for review. It is also handy for SQL queries, configuration files, and quick code reviews when you want to spot structure issues faster.
A formatted snippet is easier to debug, easier to explain to teammates, and easier to compare in pull requests. That makes this tool useful both for daily development and for one-off cleanup work when something has been pasted from a minified source.
Use JSON formatting as a quick validation step before shipping config files or API fixtures, because invalid JSON will be surfaced immediately. For JavaScript and HTML, remember that formatting improves readability but does not fix broken syntax. Choose 2 spaces for common web projects, 4 spaces for some back-end teams, or tabs if your codebase already uses them.
If you are formatting code from different sources, keep the language mode aligned with the actual syntax. The cleaner the input, the more reliable the output will be.
Select a language — Click JSON, JavaScript, CSS, HTML, or SQL to set the formatting rules.
Paste your code — Type or paste code into the Input pane. The beautified result appears instantly in the Output pane.
Adjust options — Change indent size (2 spaces, 4 spaces, or Tab) or enable Minify mode to compress code.
Copy or swap — Use Copy Output to grab the formatted code, or Swap to exchange the input and output panes.
JSON — Full parse/stringify formatting with customizable indentation. Includes error messages for invalid JSON.
CSS — Standard formatting with proper indentation of selectors, properties, and values.
JavaScript — Basic indentation and structure formatting.
HTML — Basic structure formatting for readability.
SQL — Basic keyword alignment and structure formatting.
All formatting happens locally in your browser. When you paste code or select a language, the tool analyzes the code structure and applies formatting rules specific to that language. JSON is parsed and re-stringified for perfect formatting. CSS and other languages use regex-based indentation. No code is ever uploaded to any server.
We support JSON, JavaScript, CSS, HTML, and SQL. JSON formatting is exact using native JSON.parse/stringify. Other languages use pattern-based formatting.
No. All formatting happens entirely in your browser. Your code never leaves your device and is not uploaded to any server.
Yes. You can choose between 2 spaces, 4 spaces, or tabs. The tool applies your preference during the current session.
Enable the Minify checkbox to compress JSON output by removing whitespace. For other languages, the tool focuses on beautification rather than minification.
For JSON, the tool requires valid JSON syntax. Use a JSON validator first to check for missing commas, brackets, or quotes. For other languages, the tool applies best-effort formatting even with minor syntax issues.
No for valid JSON and generally no for well-formed code in the other supported formats. Beautifying changes whitespace, indentation, and line breaks, but it should not change the meaning of the code. If the input is already malformed, though, the tool can only improve readability where the syntax still makes sense.
Fix the syntax first, then format it in the matching language mode. For example, paste JSON into JSON mode, not JavaScript mode, and split mixed content into separate snippets when possible. The formatter works best when each input block has one clear syntax.