Diffpad
Paste. Compare. Copy the diff.
Semantic comparison
Compares by key paths, not line positions. Reordered keys produce zero noise.
Auto-detect format
Automatically detects JSON or YAML. No manual format selection required.
Client-side only
Everything runs in your browser. No data is sent to any server.
What Is Semantic Diffing?
Traditional text diff tools — like git diff or the Unix diff command — compare files line by line. If you reorder the keys in a JSON object, every line shows as changed even though the data is semantically identical.
Semantic diffing works differently. It parses each document into a tree, then compares values by their key paths. Reordered keys are ignored. Only actual data changes (additions, removals, and modified values) are reported.
Text Diff vs. Semantic Diff
Text Diff (line-based)
- Compares raw text line by line
- Key reordering shows as changes
- Whitespace and formatting differences trigger false positives
- Works on any file type
Semantic Diff (structure-based)
- Parses into a tree, compares by key path
- Key reordering is ignored
- Formatting differences are normalized
- Best for JSON, YAML, and other structured data
When to Use Diffpad
- API response comparison — Compare two API responses to find what changed between versions or environments.
- Config file review — Diff staging vs. production YAML or JSON configs to spot unintended changes before a deploy.
- Data migration validation — Compare source and target JSON documents after a migration to verify completeness.
- Schema evolution — Track how a JSON schema or OpenAPI spec changes between releases.
Supported Formats
Diffpad supports JSON (including JSON with comments) and YAML (including multi-document YAML). Paste any supported format and Diffpad identifies it automatically — no manual format selection needed.
Who It's For
Backend engineers
Comparing API responses across environments or versions.
DevOps / SRE
Diffing Kubernetes manifests, Terraform state, or Helm values before deploy.
QA engineers
Validating data migrations or verifying test fixture changes.
Anyone working with config files
If you paste JSON or YAML into your workflow, Diffpad can help you spot what changed.
Why "Diffpad"?
Diff + notepad. You paste two things into a pad, and it shows you the diff. That is the whole idea.
Privacy
This tool runs entirely in your browser. No data leaves your device. There are no accounts, no tracking, and no cookies beyond what the ad network may set. See our Privacy Policy for details.