Chat Examples

Create a simple chatbot

To initialize a new chat:

// In React
const { utils: { Chat } } = usePolyfire();
// In other environments
const { utils: { Chat } } = polyfire;

const chat = new Chat();

To send your first message to the chatbot:

const first = await chat.sendMessage("Who was the first man to walk on the moon?");

console.log(first); // Neil Armstrong.

Your chatbot will return the answer and remember the previous messages.

const second = await chat.sendMessage("Who was the second one?");

console.log(second); // Buzz Aldrin.

const president = await chat.sendMessage("Who was the US President at the time?");

console.log(second); // Richard Nixon.

const firstNames = await chat.sendMessage("What were the first names of these three?");

console.log(firstNames); // Neil, Buzz and Richard.


As for the stream with generate function, you can choose to get streams instead of promises by adding stream option to sendMessage method.

const resultStream = chat.sendMessage("Who was the first man to walk on the moon?", {stream: true})

resultStream.on("data", (d) => console.log(d)); // The answer should start to be printed on the console word by word

await new Promise((res) => stream.on("end", resultStream)); // This is just to wait the end of the stream, this is not required

Chat context

You can add context to your chatbot by the systemPrompt parameter. Pass a string containing your context when initiating the chat object.

const systemPrompt = `Ask a random physics question. If the Human answers correctly, ask another question...`;
const chat = new Chat({ systemPrompt });

Get the message history

You can use the getMessages method to get the previous messages

It will return an array of Messages sorted from the most recent ones to the oldest:

type Message = {
  id: string; // A unique id for the message
  chat_id: string; // A unique id for the chat
  is_user_message: boolean; // Whether the message was send by the user or the chatbot.
  content: string; // The content of the message
  created_at: string; // An ISO date for the time when the message was sent

For example, after having run our example above:

const history = await chat.getMessages();

const lastAnswer = history[0];

console.log(lastAnswer.content); // Neil, Buzz and Richard.

Chat options

type ChatOptions = {
  provider?: "openai" | "cohere" | "llama"; // The default value is "openai"
  systemPrompt?: string; // The system prompt as seen above
	systemPromptId? string // The Id of a custom prompt
  autoMemory?: boolean;


You can change the model provider using the provider option.

For example, to create a chatbot using cohere:

const chat = new Chat({ provider: "cohere" });


The autoMemory option allows to send every message of the chat to a new memory and use it in every message.

This adds a long-term memory to the chatbot.

const chat = new Chat({ autoMemory: true });

await chat.sendMessage("The secret word is banana42");

... Send a lot of messages here

await chat.sendMessage("What is the secret word?"); // The chatbot should still answer with banana42


The systemPromptId option allows you to add the ID of a custom prompt that you've created using the prompt features or by directly using a prompt shared by another developer.