---
title: Create Custom API in Power Apps
description: "Creating a custom API in [Power Apps](https://globaldata365.com/power-apps/) allows you to define your own logic and expose it as an endpoint that can be used in apps, flows, or other integrations. Here’s a step-by-step guide to help you get started—perfect if…"
url: "https://globaldata365.com/helpcenter/create-custom-api-in-power-apps/"
updated: "2026-10-25"
category: Power Apps
---

# Create Custom API in Power Apps

Creating a custom API in [Power Apps](https://globaldata365.com/power-apps/) allows you to define your own logic and expose it as an endpoint that can be used in apps, flows, or other integrations. Here’s a step-by-step guide to help you get started—perfect if you want to build more control and flexibility into your Power Platform solutions.  

#### Pre-requisites:

- Make sure you're working within a solution in Power Apps.
- Ensure the solution has a publisher with a customization prefix (e.g., `sample_`).
- Plan your API design well—some fields can’t be changed later.

  

### Step-by-Step: Create a Custom API

  

#### 1. **Create the Custom API Record**

- Inside your solution, go to **New > More > Other > Custom API**.
- Fill out the required fields such as:

  - Name (with prefix)
  - Binding Type
  - Bound Entity
  - Is Function or Is Action
- Save your custom API.
   ![create custom API in Power Apps](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/media/saved-customapi-form.png)

#### 2. **Add Request Parameters** (Optional)

- Go to **New > More > Other > Custom API Request Parameter**.
- Define the fields needed to pass data into your API.
- Save the parameter.

#### 3. **Add Response Properties** (Optional but required for Functions)

- Go to **New > More > Other > Custom API Response Property**.
- Define what data your API will return.
- Save your response setup.

#### 4. **Check It in Metadata**

- Open a browser and go to:
  `https://yourorg.crm.dynamics.com/`
- Search for your API name (e.g., `sample_CustomAPIExample`).
- You’ll see your defined parameters and return types in the XML.

 **Want to build apps without writing code?** [👉 Join our Power Apps Training](https://globaldata365.com/power-apps-training/) for expert-led, hands-on learning.

#### 5. **Add Your Plug-in Logic** (Optional but powerful!)

- If you want your API to run logic:

  - Write your plug-in (using C#).
  - Register it using the Plug-in Registration Tool.
  - Set the Plug-in Type lookup in your Custom API form

 ![create custom API in Power Apps](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/media/set-custom-api-type.png) Once everything is set, you can test your custom API using tools like Postman, [Power Automate](https://globaldata365.com/power-automate/), or directly in your app. You can also use the Custom API Designer inside the Plug-in Registration Tool for a visual way to build APIs, or even automate the process using code or solution files for ALM.

###

###### Still have Questions?

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