Developer Tools
JSON Diff & Merge
Paste left and right JSON values, then generate a readable diff or a merged JSON result in seconds. This page is useful for API payload checks, config review, fixtures, and debugging workflows.
Compare and Merge JSON Online
Compare two JSON values and generate a readable diff or merged JSON output online for API payloads, config files, fixtures, and debugging workflows.
Why Use This JSON Diff & Merge
- Inspect and transform developer-focused text quickly
- Copy results for debugging, documentation, and integrations
- Use sample input for quick testing
- Download the output as a file
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Common Situations Where This Helps
- You want to compare two API payloads or config snapshots.
- You need a quick merged JSON result from two objects.
- You are debugging why one environment config differs from another.
- You want readable path-level differences without diffing by hand.
Which Tool Should You Choose?
Diff: Use this when you want to inspect added, removed, and changed JSON paths.
Merge: Use this when you want a single combined JSON object from two inputs.
Common Problems and Fixes
Two JSON payloads look similar but are not identical.
Run Diff mode to get a readable list of changed, added, and removed paths.
I need one combined JSON result quickly.
Run Merge mode and choose whether the left or right side should win on conflicts.
I do not know which side changed a nested value.
Use Diff mode to inspect nested path-level changes clearly.
Related Guides
Frequently Asked Questions
How do I diff two JSON values?
Paste the left JSON and right JSON, choose Diff mode, and run the tool to see added, removed, and changed paths.
How does JSON merge work here?
Merge mode combines both JSON values deeply. You can choose whether the right side or left side wins when the same path exists in both.
Is this JSON diff and merge tool free?
Yes. It is free to use in your browser.