API versioning in Ruby on Rails

Versioning APIs is a critical part of building web applications, as it allows you to make changes that may otherwise break existing API users. Changing the contract between the API and the clients that depend on it is dangerous, and versioning endpoints adds flexibility and safety. Versioning is implemented in many ways - You can version with subdomains, query parameters, URL schemas, headers, and more!Still, developers looking to introduce a new version of an API that wasn't originally versioned may find themselves in a pickle. Clients may be calling an endpoint that takes the form base_url/all_users, so replacing it with something like base_url/v1/users presents an obvious problem. In this article, we'll explore how to version an API built with Ruby on Rails and walk through options for versioning an existing Rails API.