explaingit

androidpoet/cloudflare-kmp

11KotlinAudience · developerComplexity · 3/5LicenseSetup · moderate

TLDR

A Kotlin Multiplatform library that lets Android, iOS, and desktop apps safely access Cloudflare's database, key-value store, and file storage without embedding secret credentials inside the app.

Mindmap

mindmap
  root((cloudflare-kmp))
    What it does
      Safe Cloudflare access
      No secrets in app
      Gateway pattern
    Modules
      D1 SQL database
      KV key-value store
      R2 file storage
      Realtime channels
    Platforms
      Android
      iOS
      JVM server
      WebAssembly
    Setup
      Gradle dependency
      Worker URL
      Publishable key
    Status
      D1 and KV ready
      R2 in progress
      Realtime stubbed
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Things people build with this

USE CASE 1

Add Cloudflare D1 database access to an Android and iOS app using the same Kotlin code for both platforms.

USE CASE 2

Store user settings and tokens in Cloudflare KV from a Kotlin Multiplatform app without embedding secret keys in the client.

USE CASE 3

Build a mobile app backend on Cloudflare infrastructure while keeping all account credentials safely server-side.

USE CASE 4

Query and update a shared Cloudflare D1 database from Android, iOS, and a JVM server with one shared codebase.

Tech stack

KotlinKotlin MultiplatformCloudflare WorkersGradle

Getting it running

Difficulty · moderate Time to first run · 30min

Requires a Cloudflare Worker deployed as a server-side gateway before the client library can connect.

MIT license, use freely for any purpose including commercial projects, as long as you keep the copyright notice.

In plain English

Cloudflare KMP is a Kotlin library that lets mobile and desktop apps talk to Cloudflare's backend services without exposing sensitive account credentials inside the app. Cloudflare provides a powerful set of hosted services for storing data, files, and real-time connections, but it does not offer an app-safe key model the way some other platforms do. This library fills that gap by sitting a small server-side gateway between the app and Cloudflare, so the app only ever sees a public URL and a publishable key. The library targets Kotlin Multiplatform, meaning the same code can run on Android, iOS, JVM servers, and WebAssembly targets without rewriting anything. It breaks into separate modules so you install only the pieces you need. The D1 module covers Cloudflare's SQL database, with a table API that lets you query, insert, update, and delete rows using Kotlin code rather than raw SQL strings. The KV module handles Cloudflare's key-value store, which is suited to storing settings, tokens, or small JSON documents. An R2 module shapes the API for file storage uploads and downloads, and a realtime module sketches out a channel-based model for live updates. The project is at an early alpha stage. D1 and KV routes compile and run. R2 signing and the realtime WebSocket transport are defined as API shapes but are not fully implemented yet, and the library notes those gaps explicitly rather than hiding them. Setup requires adding the relevant modules as dependencies in a Kotlin project build file, then writing a short initialization block with a Worker URL and publishable key. From there, operations follow a result-based pattern that lets you chain success and failure handlers instead of relying on exceptions. The library is released under the MIT license. Documentation pages for architecture, security model, and deployment are listed in the README but live in a separate docs folder within the repository.

Copy-paste prompts

Prompt 1
Help me add the cloudflare-kmp D1 module to my Kotlin Multiplatform project and write a query to fetch all rows from a users table.
Prompt 2
Show me how to deploy the Cloudflare Worker gateway that cloudflare-kmp requires and configure the publishable key in my Android app.
Prompt 3
Using cloudflare-kmp KV module, write Kotlin code to save and retrieve a user preference value with success and failure handlers.
Prompt 4
What is the difference between cloudflare-kmp's D1 table API and raw SQL, and when should I use each approach?
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