Online JSON Diff — Compare Two JSON Documents

Paste two JSON payloads and highlight structural differences. Useful for API regression checks, config reviews and debugging — nothing uploaded.

Original JSON

Updated JSON

Compare keys only (ignore values)

Comparison runs entirely in your browser. Nothing is uploaded to FastMinify.

Loading…

JSON diff — comparison playbook

Compare two JSON documents side by side and highlight structural differences. Summary badges list changed, added and removed paths — all processing stays local.

Developer notes

• Both panels must contain valid JSON before Compare runs. • Toggle keys-only mode to ignore value changes when reviewing schema drift. • The summary dashboard lists affected JSON paths for quick scanning. • Comparison logic is structural — array order and nested paths matter.

When teams pick this route

• API regression checks between staging and production responses. • Config reviews when Helm or Terraform exports JSON snapshots. • Debugging feature flags or A/B payload differences. • Validating converter round-trips before merging.

Worked examples

Feature flag flip

Original JSON

{
  "feature": "checkout-v2",
  "enabled": false,
  "rollout": 0
}

Updated JSON

{
  "feature": "checkout-v2",
  "enabled": true,
  "rollout": 25
}

Nested key added

Original JSON

{
  "user": {"id": 42, "name": "Ada"}
}

Updated JSON

{
  "user": {"id": 42, "name": "Ada", "role": "admin"}
}

Navigate related JSON tools

Validate inputs with the JSON validator, prettify either side via the JSON formatter, or inspect structure in the JSON tree viewer. Compress winners with our JSON minifier.