100% Free & Browser-Only

Merge Two JSON ObjectsInstantly Online

Combine JSON objects with deep merge, shallow merge, or custom conflict resolution. No uploads. No account. Works entirely in your browser.

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Deep & Shallow Merge

Choose deep merge to recursively combine nested objects, or shallow merge to overwrite top-level keys only.

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Smart Array Handling

Control how arrays are merged — concatenate them, replace with the second value, or merge by index.

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Conflict Resolution

Decide how key conflicts are resolved: prefer the left object, the right object, or see both values.

Merge mode:
Arrays:
Conflicts:

Frequently Asked Questions

Everything you need to know about JSON Merger.