Fillout (API Key)

🚀 Quickstart
🔗 Useful links
🚨 API gotchas

Create an integration

In Nango (free signup), go to Integrations -> Configure New Integration -> Fillout (API Key).

Authorize Fillout (API Key)

Go to Connections -> Add Test Connection -> Authorize, then enter your Fillout API key. Later, you’ll let your users do the same directly from your app.

Call the Fillout API

Let’s make your first request to the Fillout API (fetch a list of all your forms). Replace the placeholders below with your secret key, integration ID, and connection ID:

cURL
Node

curl "https://api.nango.dev/proxy/v1/api/forms" \
  -H "Authorization: Bearer <NANGO-SECRET-KEY>" \
  -H "Provider-Config-Key: <INTEGRATION-ID>" \
  -H "Connection-Id: <CONNECTION-ID>" \

Install Nango’s backend SDK with npm i @nangohq/node. Then run:

import { Nango } from '@nangohq/node';

const nango = new Nango({ secretKey: '<NANGO-SECRET-KEY>' });

const res = await nango.get({
  endpoint: '/v1/api/forms',
  providerConfigKey: '<INTEGRATION-ID>',
  connectionId: '<CONNECTION-ID>'
});

console.log(res.data);

Or fetch credentials dynamically via the Node SDK or API.

✅ You’re connected! Check the Logs tab in Nango to inspect requests.

Next step: Embed the auth flow in your app to let your users connect their Fillout accounts.

Topic	Links
Authorization	Guide to connect to Fillout (API Key) using Connect UI
General	Fillout Website
	Fillout Dashboard
Developer	Generate an API key
	Fillout API docs
	API Key Authentication
	API rate limiting

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