Code formatters & beautifiers online

Prettify minified JSON, SQL, HTML, CSS, and JavaScript. Validate syntax and minify for production — all in your browser.

// 5tools in this category

json formatter

prettify, minify, validate, tree view

sql formatternew

reformat any sql dialect cleanly

html formatternew

indent, minify, validate

css formatternew

expand, minify, clean up rules

js beautifiernew

unminify and format messy js

// about

Code formatters take minified, machine-generated, or inconsistently indented code and apply a consistent style. This makes code readable, easier to diff in version control, and simpler to debug. All formatters work client-side, so you can safely paste production configs, internal queries, or proprietary code without sending them to a server.

// common use cases

Prettify a minified API response before pasting it into a ticket or Slack message
Validate JSON config files before committing to a repo
Minify CSS or JavaScript for production deployments
Format SQL queries copied from a legacy codebase for readability

// faq

Can I format minified production code safely?

Yes. All formatting runs in your browser — nothing is sent to a server.

Does the formatter validate syntax?

The JSON formatter strictly validates against the JSON spec and reports the exact error position. SQL and HTML formatters parse on a best-effort basis and produce output even for slightly malformed input.

Can I minify as well as prettify?

Yes. JSON, HTML, and CSS formatters include a minify mode that strips whitespace and comments to produce the smallest possible output for production.