Fix JSON duplicate keys
JSON allows duplicate keys, but most parsers use only the last value. Duplicate keys can cause bugs and unexpected behavior.
Common causes
- Same key repeated in an object.
- Copy-paste or merge errors.
- Generated JSON from multiple sources.
How to fix
- Remove duplicate keys and keep a single value per key.
- Use a JSON validator to detect duplicates.
- Consider a schema to enforce uniqueness.
Use our tool
Validate JSON