JSON Deduplicate — Remove Duplicate Keys & Values
Remove duplicate object keys (keep first or last) and deduplicate array values in JSON. Detect duplicates before cleaning — all client-side.
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JSON input
Deduplicated JSON
About this tool
Duplicate keysArray dedupeFirst/last keepDetection countFullscreen
How to use
- Paste JSON — duplicate keys in source are detected automatically.
- Choose keep first or last for duplicate keys.
- Enable array value dedupe if needed, then copy the cleaned JSON.
Examples
Duplicate keys
{"id":1,"id":2,"name":"Ada"}{"id":2,"name":"Ada"} (keep last)