API Introduction

Basic concepts of working with the Fulcrum API to access, create, and modify data

The Fulcrum JSON API uses REST endpoints for querying, creating, updating, and deleting data. The API provides users the ability to: query the URL for information using a GET request, to update the dataset by sending a PUT, or to delete the dataset by sending a DELETE. Each operation is a URL endpoint that represents either a single object or a collection of objects.

Base URL

The base URL for the Fulcrum API is https://api.fulcrumapp.com. Each individual API resource has its own set of methods and endpoints for creating, reading, updating, and deleting that resource. The endpoint should be appended to the base URL to create the API call. See the examples at the end of each documentation section for additional guidance.

JSON Headers

For all requests, be sure to set the Accept HTTP header to application/json.

For POST and PUT requests, be sure to set the Content-Type HTTP header to application/json.


API calls are authenticated with a simple API Key (token) that is provided with the request. The API Key can be passed as an HTTP request header or as a parameter in the query string.

Obtaining your API Key

Create a new API token

The API Key is unique for each organization you have a membership with.

You can find the API key by browsing to the Settings page and selecting the API tab. You can generate separate API keys for different purposes. Keep in mind that when generating keys, you’ll only get one shot at storing it somewhere, so copy and keep them in a safe place.

Note: The API Key can be used to access and modify all data which you have permission to access within that organization, so be sure to keep the API key private. Only share it with others if you want them to have that access. It is bad practice to put API Keys in source code, especially if it’s publicly available. If you think your API key has been compromised, you can generate a new one from your Fulcrum account API settings page.

HTTP Request Header

You can send the API Key as an HTTP request header.

X-ApiToken = myapikey

Test your API Key from a command prompt using cURL:

curl -H "X-ApiToken: myapikey" https://api.fulcrumapp.com/api/v2/forms

Query String Parameter

You can send the API Key as a query string parameter. This can be useful when you can’t set an HTTP header for your request.


Test your API Key from a command prompt using cURL.

curl "https://api.fulcrumapp.com/api/v2/forms?token=myapikey"

Time Stamps

All timestamp values in Fulcrum are stored in UTC and served in the ISO 8601 standard: 2012-04-20T20:35:45Z.

In Javascript (test with node in the terminal):

new Date("2012-04-20T20:35:45Z")
=> Fri Apr 20 2012 16:35:45 GMT-0400 (EDT)

In Ruby (test with irb in the terminal. Don’t forget to require 'time'):

=> 2012-04-20 20:35:45 UTC

Unique ID’s

Fulcrum uses unique string identifiers to refer to all system objects. The ID’s are opaque strings and guaranteed to be unique across your account. They’re opaque in the sense that you should not need to parse them. If you need to persist Fulcrum ID’s, it’s best to use a string data type and not a GUID/UUID data type. In addition to being case-sensitive for compatibility reasons, not all Fulcrum ID’s are UUID’s. Some older Fulcrum records might have ID’s in a different format.


All of the index views use pagination. The following information will be returned in the root object to help you determine where you are in the query:

  "current_page": 1,
  "total_pages": 1,
  "per_page": 50



There are several open source libraries available for working with the Fulcrum API in your language of choice.