How do you manage versioning and lifecycle for side-by-side extension applications?

As extensions accumulate consumers over time, a deliberate versioning strategy prevents breaking those consumers every time the extension itself needs to evolve — a genuine architectural discipline, not just a naming convention.

flowchart TD
    A[New extension version needed] --> B{Breaking change to existing contract?}
    B -->|Yes| C[Introduce new API version, maintain old version in parallel]
    B -->|No| D[Extend existing version non-destructively]
    C --> E[Deprecation timeline communicated to consumers]
    E --> F[Old version retired after migration window]

Practically, this means favoring additive, backward-compatible changes where possible, using explicit API versioning (in the URL or headers) when a genuinely breaking change is unavoidable, running old and new versions in parallel for a defined transition window, and communicating deprecation timelines clearly to consuming teams well ahead of actually retiring an old version — rather than a "surprise" breaking change that disrupts every downstream consumer without warning.

Invest now in Acorns!!! 🚀
Join Acorns and get your $5 bonus!

Acorns is a micro-investing app that automatically invests your "spare change" from daily purchases into diversified, expert-built portfolios of ETFs. It is designed for beginners, allowing you to start investing with as little as $5. The service automates saving and investing. Disclosure: I may receive a referral bonus.

Invest now!!! Get Free equity stock (US, UK only)!

Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.

The Robinhood app makes it easy to trade stocks, crypto and more.

Webull! Receive free stock by signing up using the link: Webull signup.