Code Formatter
Format, validate and minify JSON, CSS, HTML, SQL and JavaScript. Real-time output. Free, private, no upload.
Input
Output
Output will appear here
About Code Formatter
The Code Formatter beautifies and validates source code in JSON, CSS, HTML, SQL, and JavaScript — with configurable indentation and instant results. Paste messy, minified, or poorly formatted code and get a clean, readable version in one click. All processing is local; nothing is sent to a server.
Use Cases
- →Beautify minified JSON from an API response for easier debugging
- →Format SQL queries before adding them to documentation
- →Validate JSON structure to find syntax errors and missing commas
- →Clean up auto-generated HTML or CSS before code review
Tips
- ✓Use Format + Validate together to catch and fix syntax errors in one step
- ✓Tab or space indentation can be configured to match your project style guide
- ✓For large files, the formatter handles several MB without issues
Frequently Asked Questions
The formatter supports JSON, CSS, HTML, SQL and JavaScript. Each language has its own tab with specific actions — JSON includes validation with error line detection, SQL formats keywords in uppercase, and CSS/HTML/JS support both formatting and minification.
As you type, the formatter processes your code automatically after a 500ms pause. You can also switch between Format, Minify, and Validate modes at any time — the output updates instantly. No button click required.
If your JSON has a syntax error, the output panel shows the exact error message and the line number where the error was found. Common issues like missing commas, unclosed brackets, or invalid values are all detected and reported clearly.
Format adds indentation and line breaks to make code readable — ideal for debugging or reviewing code. Minify removes all unnecessary whitespace and comments to reduce file size — useful before deploying to production. Both preserve the code's behavior.
The SQL formatter automatically indents your queries, converts all SQL keywords (SELECT, FROM, WHERE, JOIN, etc.) to uppercase, and adds line breaks between clauses. The output is standard SQL that works with any database engine.
No. All formatting, validation and minification happens entirely in your browser using JavaScript. Your code never leaves your device — there are no server requests involved.