JavaScript function-calling code snippet contains syntax errors in the docs

[danpeleg4]

Confirm this is a Node library issue and not an underlying OpenAI API issue

• This is an issue with the Node library

Describe the bug

The JavaScript code snippet on Function Calling guide
contains multiple errors that prevent it from running correctly:

Invalid JS syntax:

if (item.name == "get_horoscope"):

The colon (:) is Python-style and should be replaced with { ... }.

Mismatched function name:
The snippet calls get_horoscope(...), but the function is defined as getHoroscope.

Undefined variable:
The snippet uses input_list.push(...), but input_list is never defined. It should use the input array.

Python code in JS:
The snippet uses json.dumps(...), which is Python. In JS, it should use JSON.stringify(...).

Incorrect tool output format:
The snippet uses type: "function_call_output" and call_id, which do not match the OpenAI Responses API expected format.

To Reproduce

The URL of the page: https://platform.openai.com/docs/guides/function-calling

Code snippets

import OpenAI from "openai";
const openai = new OpenAI();

// 1. Define a list of callable tools for the model
const tools = [
  {
    type: "function",
    name: "get_horoscope",
    description: "Get today's horoscope for an astrological sign.",
    parameters: {
      type: "object",
      properties: {
        sign: {
          type: "string",
          description: "An astrological sign like Taurus or Aquarius",
        },
      },
      required: ["sign"],
    },
  },
];

function getHoroscope(sign) {
  return sign + " Next Tuesday you will befriend a baby otter.";
}

// Create a running input list we will add to over time
let input = [
  { role: "user", content: "What is my horoscope? I am an Aquarius." },
];

// 2. Prompt the model with tools defined
let response = await openai.responses.create({
  model: "gpt-5",
  tools,
  input,
});

response.output.forEach((item) => {
  if (item.type == "function_call") {
    if (item.name == "get_horoscope"):
      // 3. Execute the function logic for get_horoscope
      const horoscope = get_horoscope(JSON.parse(item.arguments))
      
      // 4. Provide function call results to the model
      input_list.push({
          type: "function_call_output",
          call_id: item.call_id,
          output: json.dumps({
            horoscope
          })
      })
  }
});

console.log("Final input:");
console.log(JSON.stringify(input, null, 2));

response = await openai.responses.create({
  model: "gpt-5",
  instructions: "Respond only with a horoscope generated by a tool.",
  tools,
  input,
});

// 5. The model should be able to give a response!
console.log("Final output:");
console.log(JSON.stringify(response.output, null, 2));

OS

Web

Node version

Node V20

Library version

openai v6.9.1