Fusio is an open source API management platform which helps to build and manage RESTful APIs. We think that there is a huge potential in the API economy. Whether you need an API to expose your business functionality, build micro services, develop SPAs or Mobile-Apps. Because of this we think that Fusio is a great tool to simplify building such APIs. More information on https://www.fusio-project.org/

Code Quality Rank: L4
Programming language: PHP
License: Apache License 2.0
Tags: HTTP     API     Framework     REST     JavaScript     JSON     Swagger     OpenAPI    
Latest version: v3.3.0

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Fusio is an open source API management platform which helps to build and manage REST APIs. It can help you with the following use cases:

  • API-Product
    Fusio helps you to create a great API product, besides building an API it provides a developer portal where developers can register and a way to monetize your API
  • API-Gateway
    Fusio can be used as gateway to your internal API and microservices. It handles all common features like Authorization, Rate-Limiting and Schema-Validation
  • SPA-Backend
    Fusio can be used as backend to build SPAs using popular Javascript-Frameworks like i.e. Angular, React or Vue. It provides a powerful code generate which can automatically generate a SDK for your API
  • Low-Code-Platform
    Fusio allows you to build API endpoints without coding knowledge. I.e. it provides an Entity generator which you can use to easily create complete CRUD APIs.
  • API-Framework
    For more complex use cases you can use Fusio also as framework to build complete APIs from scratch. This means you build custom actions where you can use the wide PHP ecosystem to solve your task

API management and features

Fusio is an API management platform where you can configure routes which execute specific actions. An action triggers your business logic, it is like a controller in a classical framework, you can also think of it like a serverless lambda function, which can be executed on a route call or via RPC. Fusio covers many aspects of the API management life cycle so that you can concentrate on writing the actual business logic of your API. Please take a look at our documentation website for more information. The following feature list gives you a first overview:

  • OpenAPI generation
    Fusio generates automatically an OpenAPI specification for the defined routes
  • SDK generation
    Fusio can automatically generate a client SDK for your API based on the defined schema
  • Subscription support
    Fusio contains a event subscription layer which helps to build pub/sub for your API
  • Rate limiting
    Fusio provides a way to rate limit requests based on the user or app
  • Authorization
    Fusio uses OAuth2 for API authorization
  • RPC support
    Fusio provides RPC support, every action which you create can be also called via JsonRPC
  • Monetization
    Fusio provides a simple payment system to charge for specific routes
  • Validation
    Fusio uses the TypeSchema to automatically validate incoming request data
  • Analytics
    Fusio monitors all API activities and shows them on a dashboard
  • User management
    Fusio provides a developer app where new users can login or register a new account through GitHub, Google, Facebook or through normal email registration


Since it is difficult to work with an API only app Fusio provides apps which help to work with the API. Mostly apps are simple JS apps, which work with the internal API of Fusio. You can see a list of all available apps at our marketplace. You can install such an app either through a CLI command i.e. php bin/fusio marketplace:install fusio or through the backend app.

All apps are installed to the apps/ folder. You need to tell Fusio the public url to the apps folder at the .env file by defining the FUSIO_APPS_URL variable. Depending on your setup this can be either a custom sub-domain like https://apps.acme.com or simply the sub folder https://acme.com/apps.



The backend app is the main app to configure and manage your API. The installer automatically installs this app. The app is located at /apps/fusio/.


Fusio provides a VSCode extension which can be used to simplify action development. This means you can develop every action directly inside the VSCode editor.


  • Cloud
    The cloud service allows you to create a Fusio instance in the cloud. It really simplifies the usage of Fusio since you can create and manage an instance through a simple web interface.
  • APIgen
    APIgen is a code generator tool which allows you to generate code based on Entity or OpenAPI definitions. The tool generates then all routes, schemas and actions. You can then either download or deploy the generated code to a remote instance.


It is possible to install Fusio either through composer or manually file download.


composer create-project fusio/fusio




You can either manually install Fusio with the steps below or you can also use the browser based installer at public/install.php. Note because of security reasons it is highly recommended removing the installer script after the installation.

  • Adjust the configuration file
    Open the file .env in the Fusio directory and change the FUSIO_URL to the domain pointing to the public folder. Also insert the database credentials to the FUSIO_DB_* keys. Optional adjust FUSIO_APPS_URL to the public url of the apps folder (in case you want to use apps).
  • Execute the installation command
    The installation script inserts the Fusio database schema into the provided database. It can be executed with the following command php bin/fusio install.
  • Create administrator user
    After the installation is complete you have to create a new administrator account. Therefor you can use the following command php bin/fusio adduser. Choose as account type "Administrator".
  • Install backend app
    To manage your API through an admin panel you need to install the backend app. The app can be installed with the following command php bin/fusio marketplace:install fusio

You can verify the installation by visiting the FUSIO_URL with a browser. You should see an API response that the installation was successful.

In case you want to install Fusio on a specific database you need to adjust the driver parameter at the configuration.php file:

  • pdo_mysql: MySQL
  • pdo_sqlite: SQLite
  • pdo_pgsql: PostgreSQL
  • sqlsrv: Microsoft SQL Server
  • oci8: Oracle
  • sqlanywhere: SAP Sybase SQL Anywhere


Alternatively it is also possible to setup Fusio through docker. This has the advantage that you automatically get a complete running Fusio system without configuration. This is especially great for testing and evaluation. To setup the container you have to checkout the repository and run the following command:

docker-compose up -d

This builds the Fusio system with a predefined backend account. The credentials are taken from the env variables FUSIO_BACKEND_USER, FUSIO_BACKEND_EMAIL and FUSIO_BACKEND_PW in the docker-compose.yml. If you are planing to run the container on the internet you must change these credentials.


Please check out our official documentation website where we bundle all documentation resources: https://docs.fusio-project.org/

Ecosystem overview

This should give you a first overview about all important repositories which belong to the Fusio project:

  • Fusio
    Contains the main Fusio repository where we collect and discuss all ideas and issues
  • Fusio-Impl
    Contains the backend API implementation of Fusio. This is the place if you like to change the internal API of Fusio
  • Fusio-CLI
    Contains the CLI client for Fusio, it is automatically included in every Fusio installation but you can also run the CLI client standalone. It allows you to directly interact with the API and to deploy specific YAML configuration files
  • Fusio-Model
    Contains all Fusio models automatically generated via TypeSchema. This repository helps if you want to work with the Fusio API since you can use the same model classes which we also use at the backend
  • Fusio-Engine
    Contains mostly interfaces which are also needed by adapters. This repository is very stable and there are few changes
  • Fusio-Adapter
    Page which shows all available adapters. An adapter can extend Fusio by providing i.e. custom Actions or Connections to different services. I.e. we have an adapter MongoDB which helps to work with a MongoDB
  • Fusio-Docker
    Contains a Docker-Image to run Fusio, it helps to quickly create a Fusio instance in the cloud. You can find it also directly on DockerHub
  • Fusio-Docs
    Contains our complete documentation website. This is the place if you like to adjust or improve our documentation
  • App-Backend
    Contains the Fusio backend app which you can use to configure your API. This is the place if you like to change or improve the backend app
  • App-Developer
    Contains a developer portal app where external developers can register to use your API


Contributions to the project are always appreciated. There are many options available to improve the project (which is not limited to coding). The following list shows some ways how you can participate:


If you are a PHP or Javascript developer you can help to improve the system. If you want to create a new feature it is in general recommended to create a new issue where we can talk about the feature before you start to hack on it. So there are three main components of Fusio:


The backend API is the core of the system developed in PHP, which provides the basic functionality of Fusio. This is the place to develop new core features and improvements.


An adapter is a plugin to the Fusio system which can be used to connect to other remote services. I.e. you could create a new adapter which speaks to a specific API or other remote service. This is easy to develop since you can build it in a separate repository. Please use the keyword fusio-adapter in your composer.json file so that adapter gets listed automatically on our website.


This is the Angular app which is used as GUI to control the backend. It is the main app to improve the Fusio backend. But you are also free to develop new apps for special use cases which talk to the internal API of Fusio.


We have a high PHPUnit test case coverage. Beside this it is always great if users checkout the current master version of the project and try to test every aspect of the system. In case you have found an issue please report it through the issue tracker.


We want to create a system which is easy to use also by novice users. To enable everybody to start using Fusio we need a great documentation. We have bundled all documentation at our documentation website please feel free to adjust or contribute new documents in case you think something is missing or wrong.



If you are a blogger or magazine we would be happy if you like to cover Fusio. Please take a look at the Media section of our About Page to download the official icon set. In case you have any questions please write us a message directly so we can help you to create great content.


If you are a company or freelancer and want to get detailed information how you can use Fusio you can contact us for consulting. In the workshop we try to find the best way how you can use/integrate Fusio also we try to explain the functionality and answer your questions.


If this project helps you to generate revenue or in general if you like to support the project please check out the donation options at our repository.