Code Formatter

Beautify, minify and validate JSON, HTML, CSS, SQL, XML and YAML.

Processed locally — nothing is uploaded

Input

Output

About Code Formatter

Useful for making a minified payload readable again, for checking that a config parses before you ship it, or for stripping a file down for production. Switching language keeps whatever you have already pasted.

Paste messy or minified code and instantly beautify, minify or validate JSON, HTML, CSS, SQL, XML and YAML. Beautifying re-indents your source with consistent spacing so it is easy to read and review; minifying strips whitespace and comments to ship smaller files; validating surfaces syntax errors with the exact location so you can fix them fast.

It also doubles as a converter between common data formats — JSON to CSV, CSV to JSON, YAML to JSON and back — which is handy when wiring up APIs, configs or spreadsheets. Converting is where structure mismatches surface: CSV has no nesting, so a nested JSON object has to be flattened or dropped.

Learn how this works

A Practical Guide to Everyday Developer Encoding & FormattingHow and when to use Base64, JSON formatting, hashing, JWTs, regex and cron — with free in-browser tools for each task.11 min read

Frequently asked questions

Is my code sent to a server to be formatted?

No. Everything runs locally in your browser using standard web APIs — your text, files and inputs are never uploaded to a server, so the tool works even offline once the page has loaded.

Which languages and formats are supported?

JSON, HTML, CSS, SQL, XML and YAML for beautify, minify and validate operations, plus bidirectional conversion between JSON↔CSV and YAML↔JSON. This covers the most common web and configuration formats, making it easy to reformat API responses, validate configuration files, or transform structured data between export formats. The beautify function is especially useful for minified code from production environments or third-party libraries.

Why does my JSON show an error?

The validator reports the first syntax problem it finds — usually a trailing comma, a missing quote or an unbalanced bracket. The exact location is highlighted so you can navigate directly to the problem without scanning the entire file. Common issues include forgotten commas between array elements, mismatched curly braces, or quote marks that don't close. Once you fix the highlighted spot and re-run, the validator will either confirm the JSON is valid or report the next error in sequence.

Pro Tips

→Paste unformatted JSON, HTML, CSS, or SQL code and apply consistent indentation (2, 4, or tab spaces) in one click.
→Use minification toggle to reduce code size by 30-50% for production deployment or email constraints.
→Export formatted code directly to clipboard to paste into documentation, emails, or config files instantly.
→Compare formatted vs minified side-by-side to verify code compression doesn't break syntax.

Common Use Cases

•Frontend developers cleaning up API responses and configuration files before committing to version control.
•Database administrators formatting SQL dump files and queries for readability during code reviews.
•Technical writers embedding properly formatted code snippets in documentation without manual indentation fixes.
•QA teams validating JSON test data payloads are syntactically correct before sending to staging environments.

How It Compares

While Prettier and VS Code extensions require installation and configuration, our web-based formatter works instantly on any device without setup, offering broader language support (HTML, CSS, SQL) in a single tool compared to language-specific formatters like Beautifier.io.

More Code Formatter tools

JSON to CSV Converter CSV to JSON Converter CSS Minifier JavaScript Unminifier SQL Prettifier XML Beautifier YAML to JSON Converter JSON to YAML Converter Validate JSON Online Validate JavaScript Syntax