How to Send Data to Webhooks Using Zapier JavaScript Code Step

Other Questions Zapier
1

I’m stuck trying to send data to a webhook through Zapier’s JavaScript code action. I need to use the code step because I want to pass dynamic data to the same webhook endpoint.

Here’s what I’m trying to do:

fetch('https://hooks.zapier.com/hooks/catch/123456/abc123/', {
  method: 'POST',
  body: 'name=john, status: active'
})
.then(response => {
  return response.json();
})
.then(data => {
  console.log(data);
})
.then(() => {
  callback();
})
.catch(callback);

But I keep getting this error message: “Error: You must return a single object or array of objects.”

I think I’m missing something basic here but can’t figure out what. Any ideas on how to fix this?

2

That callback() approach is outdated for Zapier code steps. Modern Zapier JavaScript actions just need you to return output directly - no callbacks needed. Try this:

const response = await fetch('https://hooks.zapier.com/hooks/catch/123456/abc123/', {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({name: 'john', status: 'active'})
});

return {webhook_response: response.status, sent_data: {name: 'john', status: 'active'}};

Hit this same issue last month. Just ditch the callback completely and make sure you’re returning an object with useful data. Your body syntax was also broken - use proper JSON format with JSON.stringify().

3

Your fetch request runs but doesn’t return anything - that’s the problem. Zapier code steps need you to return data, not just execute callbacks. Here’s how to fix it: const response = await fetch(‘https://hooks.zapier.com/hooks/catch/123456/abc123/’, { method: ‘POST’, headers: {‘Content-Type’: ‘application/json’}, body: JSON.stringify({name: ‘john’, status: ‘active’}) }); const data = await response.json(); return data; Also, your body format’s wrong - you’re mixing object and string syntax. Use JSON.stringify to format it properly. That return statement’s crucial because Zapier expects output data for the next step.

4

the main prob is ur not awaiting the fetch & missing the return. zapier code steps need data returned properly or theyll fail. also, that body format is wrong - it should be actual json, not a stringified version. switch to async/await instead of .then chains. its much cleaner.