JSON Merge
JSON Inputs
Input 1
Input 2
JSON Inputs
Input 1
Input 2
Add JSON inputs and click Merge to combine them
Add JSON inputs and click Merge to combine them
Deep merge is a smart recursive strategy. When two JSON objects share the same nested key, deep merge doesn't simply overwrite — it goes deeper and merges their child properties. This is perfect for complex config files or deeply nested business data, ensuring no detail is lost at any level.
The tool offers flexible array merge strategies. You can choose 'Concatenation' to combine arrays from multiple JSON files into one longer array, or 'Replacement' to use the last input file's array to overwrite previous ones. Choose the strategy that fits your business scenario.
In DevOps, you can write a base config and separate environment-specific configs (dev, test, prod) as JSON. Merge them with this tool to quickly generate the final effective config file, greatly simplifying multi-environment config management.
You can merge any number of JSON objects at once. The merge follows your input order strictly — later objects merge into earlier ones based on your chosen strategy (overwrite or keep), giving you precise control over config priority.
No. All JSON Merge processing happens entirely in your browser locally. Your data is never uploaded to any server. Whether it's core enterprise config data or sensitive personal business JSON, you get enterprise-grade privacy protection.