Can it fix invalid JSON automatically?

It reports the parse error so you can correct the source without guessing.

Does it support huge files?

It is meant for everyday snippets and payloads. Very large files may be limited by your browser.

Developer

Format, minify, and validate JSON without sending it to a server.

Saved in this browser for faster return visits.

JSON input

Result

Format, minify, and validate JSON without sending it to a server.

Format object

{"name":"yueyekidl","tools":["json","utm"]}

Indented JSON with validation feedback.

Tell me what worked, what felt wrong, or what you want next.