Structured output

const result = await client.chat.completions.create({
  model: process.env.LIMITLESS_MODEL,
  messages: [{ role: "user", content: "Return a JSON object naming one primary color." }],
  response_format: {
    type: "json_schema",
    json_schema: {
      name: "color",
      strict: true,
      schema: {
        type: "object",
        properties: { name: { type: "string" } },
        required: ["name"],
        additionalProperties: false,
      },
    },
  },
  max_tokens: 512,
});
const choice = result.choices[0];
if (choice?.finish_reason !== "stop") throw new Error("JSON generation did not complete");
console.log(JSON.parse(choice.message.content));