How can i createCaller from a NextJs App Router if my server uses express tRPC adapter? - tRPC

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tRPC•3y ago•

7 replies

How can i createCaller from a NextJs App Router if my server uses express tRPC adapter?

I'm using the express adapter for the server side of tRPC, and the client is a NextJS AppRouter app.
I was getting to setting up the createCaller helper to be able to call from RSC, but createCaller needs the context, which for the express adapter is the request and response objects.
The issue here is that I don't actually have the request/response objects in NextJS App router by design (https://nextjs.org/docs/app#how-can-i-access-the-request-object-in-a-layout), which leaves me unsure about how to move forward

Is tRPC unusable with this setup? Do I need a proxy adapter or is there some piece that I am missing?

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Solution

I ended up creating a wrapper around

createTRPCProxyClient

createTRPCProxyClient

that grabbed the cookies and injected the authToken into trpc using

httpBatchLink

httpBatchLink

like so:

export const createTRPCServerClient = async () => {
    const authToken = ""; // Grab from cookies
    return createTRPCProxyClient<AppRouter>({
        transformer: superjson,
        links: [
            httpBatchLink({
                url: "http://your-url.com/api/trpc",
                headers: {
                    ...(authToken ? { authorization: `Bearer ${authToken}` } : {}),
                },
            }),
        ],
    });
};

export const createTRPCServerClient = async () => {
    const authToken = ""; // Grab from cookies
    return createTRPCProxyClient<AppRouter>({
        transformer: superjson,
        links: [
            httpBatchLink({
                url: "http://your-url.com/api/trpc",
                headers: {
                    ...(authToken ? { authorization: `Bearer ${authToken}` } : {}),
                },
            }),
        ],
    });
};

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