Hey everyone! I’m building a Compose Multiplatform...

# ktor

[Yassine Abou]

Hey everyone! I’m building a Compose Multiplatform app targeting android/iOS/Desktop Kotlin-Wasm. When calling REST APIs via the Ktor client in the Wasm target, I’m stuck with two errors:
1. *Original Error*`: warning: Node.js net module is not available. Please verify that you are using Node.js` (Happens when using the CIO engine)
2. After Removing CIO Engine:`Uncaught runtime errors: ERROR wasm validation error: at offset 5557696: type mismatch: expression has type (ref null 1950) but expected externref`
3. Here is my setup:
my ktor version is 3.1.0 and
compose version is 1.7.3.
Dependencies (commonMain):

implementation(libs.ktor.client.core)
implementation(libs.ktor.client.content.negotiation)
implementation(libs.ktor.serialization.kotlinx.json)
implementation(libs.ktor.client.cio)

Koin DI Configuration:

single {  Json { ignoreUnknownKeys = true isLenient ; = true encodeDefaults = false } }
// 2. HTTP Client Configuration 
single<HttpClient> { HttpClient(CIO) { engine { requestTimeout = 0 } 
install(ContentNegotiation) { json( json = get(), contentType = ContentType.Application.Json ) } }

here is the repository link for more context: https://github.com/yassineAbou/LLMS

[Aleksei Tirman [JB]]

Can you tell me what steps must be taken to reproduce the problem using your repository?

[אליהו הדס]

CIO is only for nodejs, in Wasm target you have to choose the JS client

[אליהו הדס]

https://ktor.io/docs/client-engines.html#js

[Yassine Abou]

@Aleksei Tirman, you just need to the wasm target and that's it. I'll also send you the api key in the dms for llms ai provider.

[Aleksei Tirman [JB]]

To solve the problem, you can explicitly define the engine dependency for the wasmJS target:

lib.versions.toml:

ktor-client-js = { module = "io.ktor:ktor-client-js", version.ref = "ktor" }

composeApp/build.gradle.kts:

wasmJsMain.dependencies {
    implementation(libs.ktor.client.js)
}

And remove an explicit CIO engine reference in the composeApp/src/commonMain/kotlin/org/yassineabou/playground/app/core/di/appModule.kt