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{}JSONKits

JSON Merge Tool

Deep merge two or more JSON objects into one combined structure. Perfect for combining API responses, config files, and data sources.

Input

json
loading editor…

Paste your JSON objects here (one per line or block)...
or drop a file anywhere in this pane

Output

json

Merged JSON output will appear here...
press ⌘↵ to merge

What Is JSON Merging?

JSON merging combines two or more JSON objects into a single object using deep merge semantics. Nested objects are merged recursively, and top-level keys are combined. This is essential when combining configuration files, API responses, or data sources.

JSON merging is useful for:

  • Config Combination: Merging default and user config files.
  • API Aggregation: Combining multiple API responses into one object.
  • Data Enrichment: Adding fields from one data source to another.
  • State Management: Merging application state updates.

How to Merge JSON Objects Online

  1. Paste JSON objects: Enter two or more JSON objects separated by newlines.
  2. Click Merge: Objects are deep-merged into one.
  3. Copy the result: Use the combined JSON.

Frequently Asked Questions

How are conflicting keys handled?

Values from later objects override earlier ones. For nested objects, merging is recursive — only leaf values are overridden.

How many objects can I merge?

The tool merges two objects at a time. For more, merge the result with additional objects.

Is this tool safe?

Yes. Processing is 100% client-side.

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