API Changelog Generator
Add your API changes, set a version and date, then generate a professional changelog in Markdown, JSON, or Keep a Changelog format. Breaking changes are highlighted automatically.
Generated Changelog
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See what's included → Browse all deals →Frequently Asked Questions
What is semantic versioning?▼
Semantic versioning (SemVer) uses a three-part version number: MAJOR.MINOR.PATCH. MAJOR increments for breaking changes (incompatible API changes), MINOR for new backwards-compatible features, and PATCH for backwards-compatible bug fixes. For example, bumping from v2.0.0 to v3.0.0 signals breaking changes, while v2.1.0 signals new non-breaking features.
What makes an API change breaking?▼
A breaking change forces API consumers to update their integration code or it will fail. Common breaking changes include: removing or renaming an endpoint, changing an HTTP method, removing required or optional fields from a response, adding required request parameters, changing authentication schemes, or altering error response formats. Adding optional fields or new endpoints is typically non-breaking.
What is the Keep a Changelog format?▼
Keep a Changelog (keepachangelog.com) is a standard changelog format that organises changes under a version heading by change type: Added, Changed, Deprecated, Removed, Fixed, and Security. It prioritises human readability and follows semantic versioning conventions. It is one of the most widely adopted changelog standards in open-source projects.
How often should I release API changelogs?▼
Best practice is to maintain a living changelog updated with every release. For production APIs, publish changelogs with each versioned release. For breaking changes specifically, notify consumers at least 2–4 weeks in advance, keep the old version alive during a deprecation window (typically 3–6 months), and provide migration guides. Never silently break an API.
What should be in a migration guide?▼
A migration guide for breaking changes should include: what changed and why, the old behaviour vs new behaviour with code examples, step-by-step migration instructions, a timeline for when the old behaviour will be fully removed, and contact or support information. The goal is to make upgrading as frictionless as possible for consumers.