Connect Blazor apps and APIs

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This page describes how to connect Blazor app resources and APIs after you’ve already modeled them in your AppHost. For the full hosting API surface, see Set up Blazor hosting in the AppHost.

Connection properties

When you use WithReference / withReference, Aspire publishes service discovery endpoint values as environment variables. The key format is:

services__{resource-name}__{endpoint-name}__{index}

For example, if you reference an API resource named weatherapi with an http endpoint, Aspire exposes:

services__weatherapi__http__0

Common properties used in Blazor-hosted app models are:

Property	Description
`services__{resource}__http__0`	The first HTTP endpoint URL for a referenced resource
`services__{resource}__https__0`	The first HTTPS endpoint URL for a referenced resource
`services__{resource}__{endpoint}__0`	A named endpoint URL when the endpoint name is custom

Connect from your AppHost

Use the AppHost to connect APIs to a Blazor WebAssembly project resource, then associate the client app with a Blazor Gateway.

C#
TypeScript

var builder = DistributedApplication.CreateBuilder(args);

var weatherApi = builder.AddProject<Projects.WeatherApi>("weatherapi")
    .WithHttpEndpoint(name: "http");

var blazorApp = builder.AddBlazorWasmProject("app", "../Client/Client.csproj")
    .WithReference(weatherApi.GetEndpoint("http"));

builder.AddBlazorGateway("gateway")
    .WithExternalHttpEndpoints()
    .WithBlazorClientApp(blazorApp);

builder.Build().Run();

import { createBuilder } from './.aspire/modules/aspire.mjs';

const builder = await createBuilder();

const weatherApi = await builder
  .addProject('weatherapi', '../WeatherApi/WeatherApi.csproj')
  .withHttpEndpoint({ name: 'http' });

const blazorApp = await builder
  .addBlazorWasmProject('app', '../Client/Client.csproj')
  .withReference(await weatherApi.getEndpoint('http'));

await builder
  .addBlazorGateway('gateway')
  .withExternalHttpEndpoints()
  .withBlazorClientApp(blazorApp);

await builder.build().run();

Connect from consuming apps

Any app resource that references the same APIs can consume the services__... values directly.

var weatherApiUrl = Environment.GetEnvironmentVariable("services__weatherapi__http__0");

const weatherApiUrl = process.env.services__weatherapi__http__0;

import os

weather_api_url = os.getenv("services__weatherapi__http__0")