Paste your JSON into the editor and click Format to prettify it with proper indentation, or Minify to compress it into a single line. Invalid JSON is flagged immediately with a clear error message. Everything runs locally in your browser — your data never leaves your machine.
Not sure what an error like Unexpected token is pointing at? Our guide to
JSON "Unexpected token" errors decodes
each browser's message, from trailing commas to invisible byte order marks.