{
"name": "Alice",
"age": 30,
"tags": ["dev", "admin"]
}This tool auto-repairs trailing commas, single quotes, unquoted keys, missing commas, JS-style comments, unclosed brackets, undefined/NaN values, and concatenated JSON objects. It handles the most common JSON syntax errors developers encounter.
Yes — the output always produces valid JSON that passes strict parsing. The tool applies safe transformations and preserves your data structure and values while fixing only the syntax issues.
Absolutely. The repair engine works on any size JSON, whether it's minified, prettified, or partially broken. It processes everything in your browser with no file size limits imposed by a server.
{ a: 1, }Single quotes:{'key': 'val'}Unquoted keys:{key: 1}JS comments:// or /* */Missing commas:{"a":1 "b":2}Undefined/NaN:undefined, NaN, Infinity