# json.JSONDecodeError

- **ID:** `python/json-jsondecodeerror`
- **Domain:** python
- **Category:** encoding_error
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

JSON data is malformed. Trailing commas, single quotes, or non-JSON content.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |