JSON Formatter
Free online JSON formatter and validator. Beautify messy JSON, minify it for production, and get clear error messages for invalid JSON — all in your browser.
Output
Format, validate and minify in one place
Format pretty-prints JSON with 2 or 4 space indentation so nested structures are readable. Minifystrips all whitespace to shrink payloads. If the input is invalid you get the parser's exact error message, which usually points to the offending position.
Common gotchas: JSON requires double quotes around keys and strings, no trailing commas, no comments, and no single quotes. Your data is parsed locally in the browser and never uploaded — safe for API responses and config files.