JSON Merge
Combine multiple JSON objects into a single master document with configurable conflict resolution.
Waiting for input...Tool Settings
Deep merging recursively combines nested objects. If a key exists in both objects and both values are objects, they are merged. Otherwise, the second value overwrites the first.
All processing happens locally in your browser. Large files are handled in memory and never uploaded to any server.
Professional JSON Merge for Everyone
The JSON Merge tool allows you to join two or more JSON structures into one. You can choose between a shallow merge (top-level keys only) or a deep recursive merge. It's particularly useful for combining default configurations with environment-specific overrides or aggregating data from multiple API endpoints into a single object.
Security Note
All processing happens in your browser. Your images never leave your device.
How to use JSON Merge?
Follow these simple steps to get the best results.
Add the JSON objects you want to merge.
Configure the merge strategy (Deep vs Shallow).
Decide how to handle duplicate keys (Overwrite vs Keep Both).
Generate the merged JSON and download the result.
Frequently Asked Questions
Common questions about our JSON Merge tool.
How are arrays handled?
You can choose to either concatenate arrays, unique-merge them, or have the second array overwrite the first.
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