Encore Frontend

React Example

// frontend/src/components/UserProfile.tsx
import { useState, useEffect } from "react";
import Client from "../client";

const client = new Client(import.meta.env.VITE_API_URL);

export function UserProfile({ userId }: { userId: string }) {
  const [user, setUser] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);

  useEffect(() => {
    client.user
      .getUser({ id: userId })
      .then(setUser)
      .catch(setError)
      .finally(() => setLoading(false));
  }, [userId]);

  if (loading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;

  return (
    <div>
      <h1>{user.name}</h1>
      <p>{user.email}</p>
    </div>
  );
}

React with TanStack Query

import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
import Client from "../client";

const client = new Client(import.meta.env.VITE_API_URL);

export function UserProfile({ userId }: { userId: string }) {
  const {
    data: user,
    isLoading,
    error,
  } = useQuery({
    queryKey: ["user", userId],
    queryFn: () => client.user.getUser({ id: userId }),
  });

  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;

  return <div>{user.name}</div>;
}

export function CreateUserForm() {
  const queryClient = useQueryClient();

  const mutation = useMutation({
    mutationFn: (data: { email: string; name: string }) =>
      client.user.createUser(data),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ["users"] });
    },
  });

  const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    const formData = new FormData(e.currentTarget);
    mutation.mutate({
      email: formData.get("email") as string,
      name: formData.get("name") as string,
    });
  };

  return (
    <form onSubmit={handleSubmit}>
      <input name="email" type="email" required />
      <input name="name" required />
      <button type="submit" disabled={mutation.isPending}>
        {mutation.isPending ? "Creating..." : "Create User"}
      </button>
    </form>
  );
}

Next.js Server Components

// app/users/[id]/page.tsx
import Client from "@/lib/client";

const client = new Client(process.env.API_URL);

export default async function UserPage({ params }: { params: { id: string } }) {
  const user = await client.user.getUser({ id: params.id });

  return (
    <div>
      <h1>{user.name}</h1>
      <p>{user.email}</p>
    </div>
  );
}

CORS Configuration

Configure CORS in your encore.app file:

{
  "id": "my-app",
  "global_cors": {
    "allow_origins_with_credentials": [
      "http://localhost:3000",
      "https://myapp.com",
      "https://*.myapp.com"
    ]
  }
}

CORS Options

Authentication from Frontend

For authenticated requests, pass the Authorization header:

// Using fetch
const response = await fetch("http://localhost:4000/profile", {
  headers: {
    Authorization: `Bearer ${token}`,
  },
});

// Or include credentials for cookie-based auth
const response = await fetch("http://localhost:4000/profile", {
  credentials: "include",
});

With TanStack Query, configure a default fetcher:

const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      queryFn: async ({ queryKey }) => {
        const response = await fetch(queryKey[0] as string, {
          headers: { Authorization: `Bearer ${getToken()}` },
        });
        if (!response.ok) throw new Error("Request failed");
        return response.json();
      },
    },
  },
});

Using Plain Fetch

If you prefer not to use the generated client:

async function getUser(id: string) {
  const response = await fetch(`http://localhost:4000/users/${id}`);
  if (!response.ok) {
    throw new Error(`HTTP error: ${response.status}`);
  }
  return response.json();
}

async function createUser(email: string, name: string) {
  const response = await fetch("http://localhost:4000/users", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ email, name }),
  });
  if (!response.ok) {
    throw new Error(`HTTP error: ${response.status}`);
  }
  return response.json();
}

Environment Variables

# .env.local (Next.js)
NEXT_PUBLIC_API_URL=http://localhost:4000

# .env (Vite)
VITE_API_URL=http://localhost:4000

Guidelines

• Use encore gen client to generate typed API clients
• Regenerate the client when your API changes
• Configure CORS in encore.app for production domains
• Use allow_origins_with_credentials for authenticated requests
• Include Authorization header for token-based auth
• Use credentials: "include" for cookie-based auth
• Use environment variables for API URLs (different per environment)
• The generated client handles errors and types automatically