End-to-End Kotlin

--- title : " End-to-End Kotlin: Share Type-Safe API Contracts Across Server and Client" published : true description : " Build a shared KMP module that defines routes, DTOs, validation, and error types — consumed by both your Ktor server and Compose Multiplatform clients." tags : kotlin, android, architecture, api canonical_url : https://blog.mvpfactory.co/end-to-end-kotlin-share-type-safe-api-contracts-across-server-and-client --- ## What we are building Let me show you a pattern I use in every project that has a Kotlin backend and Kotlin clients. We will create a shared Kotlin Multiplatform module that holds your entire API surface — routes, request/response models, validation rules, and error types. Your Ktor server and Compose Multiplatform app both depend on this module. If someone renames a field or changes a route, the project will not compile until every consumer is updated. On my last project (47 endpoints, two mobile clients), this eliminated serialization mismatch bugs enti