Data Formatter

Format · Validate · Convert · Test — JSON / YAML / CSV / SQL / Regex, all in your browser

Result
Result
Sample query — edit it and hit Format to try your own.
Matches

Free Online JSON, YAML, CSV & SQL Formatter

Data Formatter is a free browser-based tool for developers who need to quickly format, validate, and convert structured data. Paste in messy, minified, or hand-written JSON, YAML, or CSV and get a clean, indented, easy-to-read result in seconds — or convert between the three formats directly, with nested objects and arrays automatically flattened into (or rebuilt from) CSV columns. A separate SQL formatter beautifies queries across nine dialects, including MySQL, PostgreSQL, SQL Server, BigQuery, and Snowflake.

A built-in Regex Tester lets you try a pattern against sample text, see every match and captured group listed instantly, run a global find-and-replace, and save your frequently-used patterns for next time — right in your browser, no account needed.

Everything runs as JavaScript in your own browser tab — there is no server component, no account, and no upload step, so nothing you paste ever leaves your machine.

Frequently Asked Questions

Is this JSON/YAML/CSV/SQL formatter free to use?

Yes. Data Formatter is completely free, has no sign-up, and runs entirely in your browser with no usage limits.

Does my data get uploaded anywhere?

No. All parsing, formatting, validation, and conversion happens locally in your browser using JavaScript. Nothing you paste or upload is ever sent to a server.

Can I convert CSV to JSON, or JSON to YAML?

Yes. The Data Converter tab converts freely between JSON, YAML, and CSV. Nested objects and arrays flatten into dot-notation columns when converting to CSV, and rebuild automatically when converting from CSV.

Which SQL dialects does the SQL formatter support?

Standard SQL, MySQL, PostgreSQL, SQLite, MariaDB, SQL Server (T-SQL), BigQuery, Snowflake, and Redshift.

Does the SQL formatter validate my query's correctness?

It checks structural issues such as unbalanced parentheses or quotes, but it does not perform full SQL grammar or semantic validation.

Can I save regex patterns for later?

Yes. Name a pattern and click Save Pattern — it's stored in your browser's local storage, so it's still there next time you visit. Saved patterns never leave your device.

What regex flavor does the regex tester use?

Your browser's native JavaScript regular expression engine, including standard flags (g, i, m, s, u, y) and named capture groups.

Can the regex tester do find-and-replace?

Yes. Enter a replacement string — including $1, $2 group references — and click Replace All to see the substituted result.