JSON Merge Tool

Combine multiple JSON objects with intelligent merge algorithms. Handle duplicate keys and nested objects.

How to Use JSON Merge Tool

1. Enter JSON Objects

Paste or type your JSON objects in the input fields. Both objects should be valid JSON.

2. Choose Merge Strategy

Select how to handle duplicate keys:

  • Overwrite: Second object's values replace first object's values
  • Preserve: Keep first object's values when keys conflict
  • Merge Arrays: Combine arrays instead of overwriting them

3. Merge and Copy

Click "Merge JSON" to combine the objects. The result will appear in the output field where you can copy it.

Example Usage

// Object 1
{"name": "John", "age": 30, "hobbies": ["reading"]}

// Object 2  
{"city": "New York", "age": 35, "hobbies": ["coding"]}

// Merged Result (overwrite strategy)
{"name": "John", "age": 35, "hobbies": ["coding"], "city": "New York"}