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CompareJSON

Quickly compare two JSON files to find differences

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What is CompareJSON?

CompareJSON is a free online tool that helps you spot differences in JSON data right in your browser. Just paste or drop two JSON files and see what keys match, what values changed, and which keys are missing or extra. All the work happens locally on your device—nothing ever gets uploaded or stored on a server. You can choose to view only matching keys, mismatches, or unique entries. It’s fast, private, and super simple to use.

Key features

  • Compare two JSON texts side by side for quick difference spotting
  • Highlight keys with same values and keys with different values
  • Identify missing or redundant keys between JSON files instantly
  • Work entirely in your browser without any server data upload
  • Choose to filter results by match, difference, or unique entries
  • Drag and drop JSON files or paste content for instant analysis