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Merge JSON Objects

Deep-merge two JSON objects with configurable scalar conflict handling.

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01
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02
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03
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JSON object combiner online

Combine configuration objects with explicit conflict rules. Review scalar conflicts and array handling before applying the merged result.

How to use it

Enter First JSON object or select Try example. Provide Second JSON object in the second editor. Review On conflicting values, Arrays. Select Run tool and inspect the result before copying or downloading.

Options and example settings

Option	Choices / value	Example default
On conflicting values	right; left	right
Arrays	replace; concat	replace

Worked examples

Combine configuration objects with explicit conflict rules.

Worked example — Merge JSON Objects

Settings: On conflicting values: right; Arrays: replace

Input:

{"user":{"name":"Anna","age":25}}

SECOND INPUT:
{"user":{"age":26,"city":"Tirana"}}

Output:

{
  "user": {
    "name": "Anna",
    "age": 26,
    "city": "Tirana"
  }
}

The example returns an object with 1 top-level field. The fields “user” identify the returned values or sections.

Limitations and common mistakes

Review scalar conflicts and array handling before applying the merged result.

Frequently asked questions

How can I combine JSON objects online?

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.