Fix
Fix JSON Trailing Comma Error
Trailing commas after the last element in a JSON object or array cause parse failures. JSON does not allow trailing commas, unlike JavaScript.
The Error
SyntaxError: Unexpected token } in JSON at position X — usually means a comma before a closing brace or bracket.
Invalid Example
{"name": "Alice", "age": 30,} — comma after 30 is invalid.
Fix
Remove the trailing comma: {"name": "Alice", "age": 30}. Use the JSON Validator to pinpoint the exact line.
Frequently Asked Questions
Why does JavaScript allow trailing commas but JSON doesn't?
JSON is a strict subset designed for data interchange. Trailing commas were excluded to prevent parser inconsistencies across languages.