Migrate from Zapier Functions to Code by Zapier

Zapier Functions is being deprecated on September 1, 2026. This guide maps each Functions feature to Code by Zapier and explains migration paths for secrets, app actions, and Python code.

Before you start

• Copy your function code. From the Functions home, open each function and save your Python code locally before the September 1, 2026 shutdown date.
• List your functions and triggers. Note which apps, triggers, and actions each function uses.
• Review Code by Zapier docs: JavaScript code in Zap workflows, Python code in Zap workflows, Use the Zapier SDK in Code steps, and How to get started with API by Zapier.

Timeline

Feature comparison

Step-by-step migration

1. Create a new Zap with a trigger

Each function trigger becomes a separate Zap trigger. If your function had multiple triggers, create one Zap per trigger or share code logic in a sub-Zap.

Create a Zap with the same trigger your function used. For trigger setup, go to Set up your Zap trigger.

2. Add a Code by Zapier step

• JavaScript (required for the Zapier SDK or API by Zapier): Use JavaScript code in Zap workflows
• Python (when you do not need the SDK): Use Python code in Zap workflows

3. Adapt your code for Code by Zapier

Choose your migration path:

• Python code without zapier.action or secrets: Reuse much of your code in a Python Code step. Update how input and output data are handled.
• zapier.action calls: Rewrite in JavaScript using the Zapier SDK.
• Secrets or custom API calls: Use API by Zapier with the Zapier SDK. Do not use fetch for these calls.

(Optional) Replace secrets with API by Zapier

Use this section if your function stored API keys or tokens as secrets.

Code by Zapier cannot store secrets like API keys in your code. If you need to call an app Zapier does not support, or an API endpoint that is not in the standard app integration, use API by Zapier with the Zapier SDK. That is the safest way to make authenticated calls without putting credentials in your code. Follow Add the Zapier SDK to a Code step to set up the step and attach your API by Zapier connection.

import requests

response = requests.post(
    "https://api.example.com/v1/items",
    json={"name": input_data["name"]},
    headers={"Authorization": f"Bearer {secrets['api_token']}"},
)

import { createZapierSdk } from '@zapier/zapier-sdk';
const zapier = createZapierSdk();

export default async function main({inputData, connections}) {
  const api = zapier.apps.api_by_zapier({
    connectionId: connections['api_by_zapier'],
  });

  const { data: result } = await api.write.custom_request({
    inputs: {
      method: 'POST',
      url: 'https://api.example.com/v1/items',
      body: JSON.stringify({ name: inputData.name }),
    },
  });

  return { result };
}

(Optional) Replace `zapier.action` with the Zapier SDK

Use this section if your function used zapier.action to call app actions.

Follow Add the Zapier SDK to a Code step to enable the SDK and attach your app connections.

zapier.action.slack.send_channel_message(
    params={"channel": "#general", "text": "Hello"},
    type_of="write",
)

import { createZapierSdk } from '@zapier/zapier-sdk';
const zapier = createZapierSdk();

export default async function main({inputData, connections}) {
  const slack = zapier.apps.slack({ connectionId: connections['slack'] });

  await slack.write.channel_message({
    inputs: {
      channel: "CHANNEL_ID",
      text: "Hello",
    },
  });

  return { success: true };
}

(Optional) Replace Python libraries

Use this section if your function relied on Python libraries beyond the standard library.

For other libraries, add third-party packages to your Code step.

4. Test and publish

Test your Zap steps, remap fields in downstream steps if needed, then publish your Zap. Once confirmed, stop or remove the original function.

Related resources

• Zapier Functions is being deprecated
• Code by Zapier help documentation

Get help

• Early Access Program (EAP) users: Ask questions in Zapier's EAP Slack.
• All customers: Contact Zapier Support for help with your migration.