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JSON Merge Tool

Merge two JSON objects directly in your browser. Supports shallow merge, deep merge, array handling, conflict detection, overwrite rules, clean output, reports, and JSON merge summaries.

Paste the base JSON object or first JSON value.

Paste the override JSON object or second JSON value.

Options

Merges two JSON values with configurable overwrite rules, array handling, conflict reporting, sorted keys, and clean browser-only output.

Output

Merged JSON output will appear here.
JSON merging happens directly in your browser. Your JSON data is not uploaded to a server.

Merging Two JSON Objects Without Losing Important Changes

JSON merge tasks come up often when combining configuration files, API payloads, test fixtures, export data, and environment-specific settings. A simple copy-paste merge can accidentally overwrite nested fields or replace arrays in a way that is hard to notice.

This JSON Merge Tool lets you combine two JSON values with deep merge, shallow merge, configurable conflict handling, array options, and a conflict report so you can see what changed before using the merged result.

Using the JSON Merge Tool

  1. Paste the base JSON into the left input box.
  2. Paste the override or second JSON into the right input box.
  3. Choose deep merge, shallow merge, or one-side output.
  4. Select how conflicts and arrays should be handled.
  5. Copy the merged JSON, summary, report, JSON result, or Markdown table.

Common JSON Merge Use Cases

  • Merging base and environment-specific configuration files.
  • Combining API response examples for documentation or tests.
  • Adding override settings without rewriting the full JSON object.
  • Checking conflicts before merging JSON manually.
  • Combining arrays with replace, concat, unique concat, or index merge rules.
  • Creating clean merged JSON for fixtures, scripts, and data reviews.

Example JSON Merge

Left:  { "settings": { "theme": "light", "ads": false } }
Right: { "settings": { "ads": true, "layout": "clean" } }

Merged:
{
  "settings": {
    "theme": "light",
    "ads": true,
    "layout": "clean"
  }
}

Deep Merge vs Shallow Merge

A shallow merge only combines the top-level keys. If both objects contain the same nested object key, the right value usually replaces the left value. A deep merge goes inside nested objects and merges their keys too.

Deep merge is often better for configuration files. Shallow merge can be useful when you intentionally want top-level sections to be replaced as whole values.

Frequently Asked Questions

What does a JSON Merge Tool do?

It combines two JSON values and lets you control how conflicts, nested objects, arrays, and null values should be handled.

Is this different from JSON Diff Checker?

Yes. A diff checker shows differences. A merge tool creates a new combined JSON result.

Can it merge arrays?

Yes. Arrays can be replaced, concatenated, uniquely concatenated, or merged by index.

What happens when the same key exists on both sides?

You can choose whether the right value wins, the left value wins, both values are kept as an array, or conflicts are only reported.

Is my JSON uploaded anywhere?

No. The merge runs directly in your browser.