JSON Merge
Deep-merge two JSON objects and concatenate overlapping arrays. Fast, free, and fully client-side.
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How the JSON Merge Works
Merges two JSON objects into a single unified document — nested objects are merged recursively, and overlapping arrays are concatenated.
Usage Example
Merge environment configuration overrides on top of default base settings.
Frequently Asked Questions
Is this a shallow or deep merge?
Deep — nested objects are merged recursively; it isn't a configurable option.
Browse more
See all JSON tools.