Check that text is valid JSON and print it on one line, with the size before and after.
Valid JSON is parsed and printed without extra space. Invalid JSON, including comments and trailing commas, stops with an error. The check does not repair the text.
The parser accepts objects, arrays, strings, numbers, true, false, and null. It does not accept comments, trailing commas, or single-quoted strings, because those are not JSON.
Minifying does not sort keys or change numbers beyond what the parser’s normal number reading does. The character counts show the pasted length and the minified length.
Paste the JSON.
If the check says it is valid, copy the minified line.
If it fails, remove comments and trailing commas and try again. This page will not guess a repair.
The minified text is {"ok":true}, and the check says valid JSON.
Treating a trailing comma as a minor style issue. The parser has to reject it.
No. The JSON formatter on this site indents JSON. This page removes the extra space.
No. It means the text is legal JSON. It does not know which keys your program requires.