app2.js

// frontend/src/App.js:15
async function register() {
    const response = await fetch("http://localhost:8080/registrations", {
        method: "POST",
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({
            firstName,
            lastName,
            email
        })
    })
    const { userId, token, channelId, apiKey } = await response.json();
    const chatClient = new StreamChat(apiKey);
    await chatClient.setUser(
        {
            id: userId,
            name: email,
            image: `https://getstream.io/random_svg/?id=${userId}`
        },
        token,
    );


    const channel = chatClient.channel('messaging', channelId);
    setChatClient(chatClient);
    setChannel(channel)
}