API management and aggregation
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Morfeu is an application to manage multiple APIs represented as YAML or XML documents. It features a browser-based visual editor that can group heterogeneous APIs together. APIs are defined formally and enriched with metadata, which enables Morfeu to present a common UI.

YAML-based APIs are commonly used in many domains to represent complex API configurations, and Morfeu makes it easier for users to engage and experiment with those APIs. Eurinome is a sister project that applies the Morfeu concept to the Kubernetes ecosystem using Helm.

Morfeu is flexible and can work with any YAML or XML API once a schema is for that API is created and added to the system.

It is licensed under the Apache 2 open-source license and is under heavy development.

Getting Started

# clone the project
git clone https://github.com/danigiri/morfeu.git
cd morfeu
# Start the backend (notice that we are setting an java env var to point to our location)
mvn clean compile jetty:run -D__RESOURCES_PREFIX=file://$(PWD)/ &
# launch the frontend
cd src/main/typescript && npm install && npm start
# This will open a browser with the application on http://localhost:3000


Introduction to Morfeu fundamentals

In this short video we showcase a Morfeu editing session with a simple YAML-based API.


Morfeu requires Java 8, Maven, Angular 6 and npm. Selenium is used for browser integration tests


Morfeu includes a fair number of unit and integration tests. Launch the following command to run them:

mvn test failsafe:integration-test -Dit.test='*IntTest' -Dapp-url='http://localhost:3000/'

This will run unit tests, integration tests and also browser UI tests using Selenium. As there is a fairly large number of them this will take some time.


APIs are complex to design, develop and use. Many organisations have an ever-growing list of APIs that gets bigger and bigger over time, having poorly-documented APIs, with contracts that are hard to use for novices and challenging for experts. This problem is exacerbated when APIs are acting in combination, or they are produced by different teams with different styles, granularity levels, etc.

Often, organisations that expose a rich API that is showing naturally end up developing a custom UI (often browser-based) that makes it easier to interact with that API. This is a valid strategy, but rich APIs are complex to develop and maintain, also requiring specific sets of skills that typical backend API developers may not have. In practice, building a complex UI for every single API is too resource and time-consuming, restricting the feasibility of custom UIs to the most popular APIs.

This problem is compounded when the underlying systems interact between themselves. It is even more complex to create all-encompassing or modular UIs that handle APIs created by different teams, crossing domain and organisational boundaries.

Morfeu proposes a generic browser-based UI to handle multiple APIs at the same time, maintaining boundaries and making it easier for engineers to test and interact with YAML and XML-based APIs (JSON or other formats can be added).



Logical organisational unit, it is expected all documents contained share the same model It also contains templates



Model represeting an API, a DSL or an abstraction layer


Elements within the model Can have cardinality, high level rules


Low level types, basic rules


Metadata related to the above items to increase usability, add some semantics and enrich models


Instances of an usage of an API, DSL or abstraction layer


Elements within a document, tied to cell models


Architecture diagrams go here



PRs or issues are welcome. Morfeu is still under heavy development.


Daniel Giribet - Twitter: @danielgiri


Copyright 2018 Daniel Giribet

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.