100% local · nothing leaves your browser
JSON Formatter & Validator
Beautify, minify and validate JSON with clear error messages. Pick an indent and format or minify in one click.
Everything runs in your browser. Nothing you paste is uploaded.
About this tool
This JSON formatter beautifies, minifies and validates JSON. Paste JSON and pretty-print it with 2 spaces, 4 spaces or tabs for readability, or minify it to a single line for transport. If the JSON is invalid you get the parser error message so you can find the problem quickly.
Everything runs in your browser with the native JSON parser, so nothing you paste is uploaded. That makes it safe for config files, API responses and payloads that may contain sensitive values.
Frequently asked questions
Does it validate as well as format?+
Yes. Formatting parses the JSON first, so a successful format means the JSON is valid. On failure it shows the exact parser error.
Is my data sent anywhere?+
No. Parsing and formatting happen entirely in your browser. Nothing is uploaded.
What is the difference between format and minify?+
Format adds indentation and line breaks for reading; minify strips optional whitespace to produce the smallest valid JSON for storage or transfer.