JSON Merge
See combine multiple JSON objects into a single master document with configurable conflict resolution.
Last updated: April 28, 2026
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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.
JSON Merge — No Uploads Required
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.
Why This Tool Exists
What makes this useful — and why I built it this way.
Unified Datasets: Combine multiple JSON structures into a single file.
Conflict Resolution: Manage key overlaps with simple merge priority controls.
Structure Optimization: Cleans and formats combined results automatically.
When You'd Use This
Real situations where this tool saves the day.
Configuration Merging: Combine project setting folders into single files.
Data Aggregation: Group separate JSON database dumps into unified feeds.
API Payload Building: Build complex payloads by merging separate data variables.
Using JSON Merge
It's straightforward — here's how it works.
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.
Questions People Ask
Honest answers about how this works.
How are arrays handled?
Short answer: You can choose to either concatenate arrays, unique-merge them, or have the second array overwrite the first.
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