JSON Validator

Validate, format and analyze JSON. Auto-fix common issues like trailing commas and single quotes.

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Common JSON Issues
  • Trailing commas after last item in object/array
  • Single quotes instead of double quotes for strings and keys
  • Unquoted keys (JavaScript object literal syntax)
  • Comments (// or /* */) — not valid in JSON
  • Missing quotes around string values
  • Use of undefined instead of null