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projectmycelium/docs/dev/guides/troubleshooting-json-errors.md
2025-09-01 21:37:01 -04:00

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# Quick Troubleshooting: JSON Parsing Errors
## 🚨 Emergency Fix
If you see JSON parsing errors in logs, run this immediately:
```bash
cd projectmycelium
python3 scripts/fix_user_data.py
cargo run
```
## Common Error Patterns
### Missing Field Errors
```
missing field `field_name` at line X column Y
```
**Quick Fix:** Run `python3 scripts/fix_user_data.py` - it handles most missing fields automatically.
### Invalid Enum Variant
```
unknown variant `OldVariantName`
```
**Quick Fix:** The Python script maps old variants to new ones automatically.
### Structure Mismatch
```
invalid type: map, expected a sequence
```
**Manual Fix Required:** Check the data structure against `src/models/user.rs` definitions.
## Step-by-Step Resolution
1. **Stop the application** if it's running
2. **Run the fix script:**
```bash
python3 scripts/fix_user_data.py
```
3. **Check the output** for what was fixed
4. **Test the application:**
```bash
cargo run
```
5. **If errors persist,** check the detailed guide: [`data-validation-guide.md`](./data-validation-guide.md)
## Prevention
- Run `python3 scripts/fix_user_data.py` after pulling schema changes
- Monitor application logs for new parsing errors
- Backup user data before making manual edits
## Need Help?
1. Check [`data-validation-guide.md`](./data-validation-guide.md) for detailed information
2. Look at `src/models/user.rs` for current schema requirements
3. Use the Rust validator in `src/utils/data_validator.rs` for detailed analysis