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Send cookies cross-origin

If your API reside on a different origin than your front-end and wish to send cookies to it, you will need to enable CORS on your server and send cookies with your requests by providing the option {credentials: "include"} to fetch.

The arguments provided to the fetch function used by tRPC can be modified as follow.

import { createTRPCClient } from '@trpc/client';

const client = createTRPCClient<AppRouter>({
fetch(url, options) {
return fetch(url, {
credentials: 'include',