Semantic JSON comparison inside your editor — find what changed between two JSON documents, with control over how keys, values, and arrays are matched. Powered by @compare-json/core.

Online playground: comparejson.com

• Compare anything JSON: the active editor against another open editor, a file on disk, or the clipboard.
• Aligned diff view: results open in VSCode's native diff editor, with both sides padded so corresponding keys line up — even when whole blocks were added or removed.
• Difference navigator: a sidebar view groups every difference by kind — Added, Deleted, Value Changed, Type Changed — and jumps to it on click.
• Semantic options (from the command Compare JSON: Configure Comparison Options, or as workspace defaults):
  • compare-json.arrayCompareMethod — byIndex (default), lcs (minimal diff), or unordered (multiset match)
  • compare-json.keyCaseInsensitive — ignore key case (default false)
  • compare-json.valueCaseInsensitive — ignore string value case (default false)
  • compare-json.numericStringEqualsNumber — treat "1" as equal to 1 (default false)

1. Open a JSON file.
2. Run Compare JSON: Compare Active Editor with... from the command palette (or the editor title menu) and pick what to compare against.
3. Browse the differences in the Compare JSON sidebar; click one to jump to it.

You can also right-click a .json file in the explorer and use Select for Compare, then Compare with Selected on the second file — the same flow as VSCode's built-in file compare.

MIT