Set Up Dune Authentication

Wire a React app for Dune auth so it can talk to CDF inside Fusion. Two flows exist; pick one based on app.json.

Pick the flow

Read app.json if present:

app.json infra	Flow	Auth source	Extra package
"appsApi"	Apps API (new Fusion app host)	connectToHostApp from @cognite/app-sdk	@cognite/app-sdk
missing / other	Classic (legacy Files API)	DuneAuthProvider + useDune() from @cognite/dune	—

No app.json? Ask the user. Default to Apps API — it's the default for npx @cognite/dune create.

Step 1 — Read state, decide whether to act

Read package.json, src/main.tsx (or src/index.tsx), vite.config.ts, app.json.

A valid setup already exists if any of these is true — in which case do nothing and report no-op:

• Classic: <DuneAuthProvider> from @cognite/dune wraps <App /> in the entry file.
• Apps API, generator pattern: connectToHostApp from @cognite/app-sdk is called inside App.tsx (or any component) and feeds the auth state into the rest of the app.
• Apps API, wrapper pattern: <AppSdkAuthProvider> from @cognite/dune wraps <App /> in the entry file. (This is a valid alternative — same useDune() API as classic, less boilerplate. Don't try to "fix" it back to the generator default.)

Detect the package manager from the lock file (pnpm-lock.yaml → pnpm, yarn.lock → yarn, otherwise npm).

Step 2 — Install missing deps

Required for both flows:

Package	Type
@cognite/dune	runtime (provides Vite plugin even in Apps API mode)
@cognite/sdk	runtime
@tanstack/react-query	runtime
vite-plugin-mkcert	dev

Apps API only, also install:

Package	Type
@cognite/app-sdk	runtime

Skip anything already in package.json. Use the detected package manager (pnpm add, npm install, yarn add; -D / --save-dev for dev deps).

Step 3 — Vite config

vite.config.ts must contain:

import { fusionOpenPlugin } from "@cognite/dune/vite";
import mkcert from "vite-plugin-mkcert";

export default defineConfig({
  base: "./",
  plugins: [react(), mkcert(), fusionOpenPlugin(), /* ... */],
  server: { port: 3001 },
  worker: { format: "es" },
});

• base: "./" — required for Fusion iframe deployment.
• mkcert() — provides HTTPS for the dev server (the Fusion parent is HTTPS).
• fusionOpenPlugin() — opens the dev URL inside Fusion automatically.
• server.port: 3001 — convention; the plugin falls back to 3001 if no port is set.

Add only what's missing. Don't remove existing plugins.

Step 4 — Wire up the entry file and component

Classic flow

src/main.tsx:

import { DuneAuthProvider } from "@cognite/dune";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
import React from "react";
import ReactDOM from "react-dom/client";
import App from "./App.tsx";

const queryClient = new QueryClient({
  defaultOptions: { queries: { staleTime: 5 * 60 * 1000, gcTime: 10 * 60 * 1000 } },
});

ReactDOM.createRoot(document.getElementById("root")!).render(
  <React.StrictMode>
    <QueryClientProvider client={queryClient}>
      <DuneAuthProvider>
        <App />
      </DuneAuthProvider>
    </QueryClientProvider>
  </React.StrictMode>
);

In components, use useDune():

import { useDune } from "@cognite/dune";

const { sdk, isLoading, error } = useDune();
// sdk is an authenticated CogniteClient

Apps API flow (generator default)

src/main.tsx does not wrap in any auth provider — auth is handled inside App.tsx:

import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
import React from "react";
import ReactDOM from "react-dom/client";
import App from "./App.tsx";

const queryClient = new QueryClient({
  defaultOptions: { queries: { staleTime: 5 * 60 * 1000, gcTime: 10 * 60 * 1000 } },
});

ReactDOM.createRoot(document.getElementById("root")!).render(
  <React.StrictMode>
    <QueryClientProvider client={queryClient}>
      <App />
    </QueryClientProvider>
  </React.StrictMode>
);

src/App.tsx calls connectToHostApp from @cognite/app-sdk. The handshake is async, so render a loader until it resolves:

import { connectToHostApp } from "@cognite/app-sdk";
import { useEffect, useState } from "react";

function App() {
  const [project, setProject] = useState<string | null>(null);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<string | undefined>();

  useEffect(() => {
    let cancelled = false;
    connectToHostApp({ applicationName: "<your-app-name>" })
      .then(async ({ api }) => {
        if (cancelled) return;
        setProject(await api.getProject());
      })
      .catch((err: unknown) => {
        if (cancelled) return;
        setError(err instanceof Error ? err.message : String(err));
      })
      .finally(() => {
        if (!cancelled) setIsLoading(false);
      });
    return () => { cancelled = true; };
  }, []);

  // render isLoading / error / authenticated UI
}

Use applicationName: appConfig.externalId (from app.json) so the host can identify the app.

Apps API flow — wrapper alternative

If the project already uses <AppSdkAuthProvider> from @cognite/dune, leave it. It wraps the same connectToHostApp handshake and gives a useDune() API identical to the classic flow. Both patterns are valid for Apps API mode.

Step 5 — Clean up superseded code

Remove only what's now redundant:

• Custom CDF auth providers/hooks
• Manual CogniteClient instantiation
• OIDC/token-management code
• CDF env vars (VITE_CDF_PROJECT, VITE_CDF_CLUSTER, etc.) — Dune/the host provide these

If unsure, leave it and flag to the user.