Output
// formatted output will appear hereFormat, minify, and validate JSON with syntax highlighting.
// formatted output will appear hereYour vote is saved on this device only.
The JSON Formatter / Validator takes messy, minified, or hand-typed JSON and makes it readable in one step. Paste your data and it pretty-prints the structure with indentation and syntax highlighting, flags parse errors so you can spot a missing comma or unclosed bracket, and can minify the same JSON back down to a compact single line for storage or transport.
It is built for developers, QA engineers, and anyone wrangling API responses, config files, or log payloads. Because it runs entirely in your browser, the JSON you paste never leaves your machine and nothing is uploaded to a server, so it is safe for sensitive data. It is completely free, with no sign-up and no limits on how often you use it.
No. All formatting, minifying, and validation happen locally in your browser. Your data is never sent to or stored on a server.
It parses your input against JSON syntax rules and reports errors such as missing commas, unbalanced brackets, unquoted keys, or trailing characters so you can fix them quickly.
No. Standard JSON does not allow comments or trailing commas, so the validator will flag them as errors. Remove them to produce valid JSON.
Format adds indentation and line breaks for easy reading, while Minify strips all unnecessary whitespace to produce the smallest valid output for storage or transmission.
No. The tool is completely free with no account, no usage limits, and no installation required.