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OpenAPI Changelog Generator

OpenAPI Changelog

Diff two OpenAPI JSON specs and summarize added/removed/changed endpoints.

Output

Run the tool to see output.

What This Tool Does

OpenAPI Changelog Generator is built for deterministic developer and agent workflows.

Generate endpoint-level changelogs by diffing two OpenAPI specs.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Programmatic Access

OpenAPI Changelog Generator is also callable as a free HTTP JSON API at https://aidevhub.io/api/openapi-changelog/ — GET with query parameters or POST with a JSON body, no authentication, CORS enabled, 50 requests/day per IP. Responses return { ok, tool, result, meta }. 

curl -s -X POST https://aidevhub.io/api/openapi-changelog/ \
  -H "Content-Type: application/json" \
  -d '{"old_spec":"{\"openapi\":\"3.0.0\",\"paths\":{\"/users\":{\"get\":{\"summary\":\"list\"}}}}","new_spec":"{\"openapi\":\"3.0.0\",\"paths\":{\"/users\":{\"get\":{\"summary\":\"list\"}},\"/orders\":{\"get\":{\"summary\":\"list orders\"}}}}"}'

Machine-readable contract: /api/tool/openapi-changelog.json All API endpoints: /agents/ LLM site index: /llms.txt

Agent Invocation

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/openapi-changelog/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/openapi-changelog/ GET openapi-changelog
POST /api/openapi-changelog/ POST openapi-changelog

Unified Runtime API

https://aidevhub.io/api/tools/run/?toolId=openapi-changelog&a=...

GET and POST are supported at /api/tools/run/ with identical validation and limits.

Limit: 10 req / 60s, input max 512 KB.

How to Use OpenAPI Changelog Generator

  1. 1

    Prepare your input

    Collect the source text or structured payload you want to process and paste it into the tool input fields.

  2. 2

    Select mode and run

    Choose the relevant mode (if available) and click Run to execute the deterministic transformation.

  3. 3

    Review warnings and output

    Check warnings, validation notes, and generated output before using the result in production workflows.

  4. 4

    Copy and integrate

    Copy the generated output and apply it in your project, API flow, or documentation pipeline.

Frequently Asked Questions

What is OpenAPI Changelog Generator?
OpenAPI Changelog Generator is a free browser-based utility on AI Dev Hub. Generate endpoint-level changelogs by diffing two OpenAPI specs.
How do I use OpenAPI Changelog Generator?
Open the tool, paste your input data, run the transform, and review the generated output panel. You can then copy the result into your workflow.
Does OpenAPI Changelog Generator store or send my data?
No. The default implementation is client-side and does not persist your content. For security-sensitive data, redact secrets before sharing outputs.