Developer · Free
JSON Formatter & Validator
Format, validate and minify JSON in your browser. Pretty-print with 2 or 4 spaces or tabs, sort keys, and see exactly where invalid JSON breaks.
About this tool
Paste JSON and it is checked and pretty-printed as you type. Choose 2 spaces, 4 spaces or tabs, or minify it to a single line for a config value or a request body. "Sort keys" orders every object's keys alphabetically (arrays keep their order), which makes two API responses much easier to compare.
When the JSON is invalid you get the parser's own message plus the line and column where it stopped, so a missing comma or a trailing one is quick to find.
Everything runs in your browser: the JSON you paste is never uploaded, logged or stored, so it is safe to use with API responses that contain tokens or customer data.
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