Repair common JSON parse errors
A parser error is a location clue, not a reason to rewrite everything. Start at the named line and inspect the character immediately before it.
Checklist
- Read the line and column, then look one token earlier.
- Add a missing comma, quote, bracket, or brace; remove a trailing comma.
- Format again and validate before changing values.
Example and limit
Example: `{ "enabled": true "count": 2 }` needs a comma after `true`.