How to use Gemini API instead of Openai API?

[Seikida]

Replace this code:

  const completion = await openai.chat.completions.create({
    model: "gpt-3.5-turbo-1106",
    max_tokens: 1000,
    temperature: 0.6,
    response_format: {
      type: "json_object",
    },
    messages: [
      {
        role: "system",
        content: `
        You are a virtual girlfriend.
        You will always reply with a JSON array of messages. With a maximum of 3 messages.
        Each message has a text, facialExpression, and animation property.
        The different facial expressions are: smile, sad, angry, surprised, funnyFace, and default.
        The different animations are: Talking_0, Talking_1, Talking_2, Crying, Laughing, Rumba, Idle, Terrified, and Angry. 
        `,
      },
      {
        role: "user",
        content: userMessage || "Hello",
      },
    ],
  });
  let messages = JSON.parse(completion.choices[0].message.content);
  if (messages.messages) {
    messages = messages.messages; // ChatGPT is not 100% reliable, sometimes it directly returns an array and sometimes a JSON object with a messages property
  }

By your code.

Something like that:

  const model = genAI.getGenerativeModel({ model: "gemini-pro"});

  const prompt = _prompt;

  const result = await model.generateContent(prompt);
  const response = result.response;
  const text = response.text();
  return text;