Paste your JSON below to instantly format, validate, or minify it — nothing ever leaves your browser.
This free online JSON formatter and validator instantly beautifies (pretty-prints), validates, and minifies JSON data. It's built for developers who need to quickly format messy or minified JSON into a readable, indented structure, spot a syntax error in an API response, or compress JSON down for production use — without pasting sensitive data into a random third-party website.
Formatting, validation, and minification all happen locally in your browser as you type or paste — nothing is sent to any server, so it's safe to use even with private API responses or internal data structures.
No — all parsing, formatting and validation happens locally in your browser using JavaScript's built-in JSON parser. Nothing is ever sent to a server.
It removes all unnecessary whitespace and line breaks to make the JSON as compact as possible — useful for reducing file/payload size.
Common causes are trailing commas, single quotes instead of double quotes, or missing brackets/braces. The error message shows roughly where the problem is.