Call Your API from a Machine-to-Machine App

Call Your API from a Machine-to-Machine App

Everything you need to know to call your API from your machine-to-machine (M2M) app

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Using Auth0 in your applications means that you will be "outsourcing" the authentication process to a centralized login page in the same way that Gmail, YouTube, and any other Google property redirects to whenever a user signs in.

With machine-to-machine (M2M) apps, however, the system authenticates and authorizes the app rather than a user.

How it works

When your app needs to fetch user data from your API:

  1. Your M2M application authenticates with your Auth0 Authorization Server.
  2. Auth0 responds with an Access Token.
  3. The Access Token can be used to call your API and retrieve requested data.

For M2M applications, Auth0 uses the Client Credentials Flow.

Flow Overview for Machine-to-Machine Apps

Implementation overview

  1. 1

    Configure your API

    Once you have created your API, you will need to authorize your M2M application and configure any scopes that applications can request during authorization.
  2. 2

    Get an Access Token

    Your app requests an Access Token from your Auth0 Authorization Server using the Client Credentials Flow.
  3. 3

    Call your API

    When your app calls your API, it includes the retrieved Access Token in the HTTP Authorization header.

To implement the Client Credentials Flow, follow our Backend/API Quickstarts. The "Calling your API" section shows the required steps.

Or, to use our API endpoints, you can follow our tutorial: Call Your API Using the Client Credentials Flow.

Keep reading


API endpoints, libraries, and best practices


Understand the fundamentals

What's next

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