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API Mediation Layer

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The API Mediation Layer (API ML) provides a single point of access for mainframe service REST APIs. The API ML offers enterprise, cloud-like features such as high-availability, scalability, dynamic API discovery, consistent security, a single sign-on experience, and documentation. The API ML consists of three components: the Gateway, the Discovery Service, and the API Catalog. The API ML facilitates secure communication across loosely coupled microservices through the API Gateway. The Discovery Service enables you to determine the location and status of service instances running inside the API ML ecosystem. The API Catalog provides a user-friendly, easy-to-use interface to view all discovered services, their associated APIs, and Swagger documentation.



Run API Mediation Layer locally


The following platform is required to run the API Mediation Layer:

The following tools are required to build and develop the API Mediation Layer:

  • Node.js and npm are required to be installed globally to run npm commands in project root folder.

Quick start

Follow these steps:

  1. Build all modules:
 ./gradlew build
  1. Install the same version of the concurrently globally:
 npm install -g concurrently@^6.0.0
  1. Run all service on your local machine:
 npm run api-layer

Alternatively, to use Docker to run the API ML, consult the Docker README.


By default, the API Mediation Layer for local development uses mock zOSMF as the authentication provider. For development purposes, log in using the default setting USER for the username, and validPassword as the password

The API Mediation Layer can also use dummy credentials for development purposes. For development purposes, log in using the default setting user for the username, and user as the password.

Configure dummy credentials provider

Configure dummy credentials provider

Modify gateway-service.yml

            #provider: zosmf
            provider: dummy

For more information, see API Mediation Layer Security.

Run integration tests

To run integration tests, follow the instructions in Integration Tests.


For more information about how the certificates between API ML services are set up for localhost, see TLS Certificates for localhost.

Contributor guidelines

To add new functionality, follow the guidelines in Contributing.

Local configuration of services

To set local environment properties for testing on your local machine including HTTPS setup, follow the guidelines in Local Configuration.

Review IDE setup to see how to configure popular IDEs for API ML development.

Onboarding Services

For guidelines to onboard services, see Zowe Docs#Onboarding Overview.

More Information

To learn about: Refer to:
Core Service - API Catalog Zowe Docs
Core Service - API Catalog UI README
Core Service - Discovery Service Zowe Docs
Core Service - Gateway Service Zowe Docs
APIML SDK - Java Enabler Zowe Docs
APIML SDK - Micronaut Enabler Zowe Docs
APIML SDK - Node.js Enabler Zowe Docs
APIML SDK - Spring Enabler Zowe Docs
APIML SDK - ZAAS Client Zowe Docs
Sample Service - Spring Enabler README
Sample Service - Micronaut Enabler README
Sample Service - NodeJS Enabler README

Contact Us

Get in touch using Zowe Communication Channels. You can find us in the #zowe-api channel on Slack.