Guide · Open source
How to use InversifyJS: setup, injection and tips
Updated · written with AI from the project's own documentation and checked against our catalogue data
InversifyJS is an inversion of control (IoC) container for TypeScript and JavaScript apps, including Node.js. It uses class constructors to identify and inject the dependencies a class needs. This guide explains what it does, how to get set up with npm, and when it fits your project better than other options.
InversifyJSinversify/InversifyJS · ★ 12.1k · MIT Install options & downloads Quick start
- 1Confirm prerequisites. Make sure Node.js and npm are installed, since these are the listed prerequisites for the package-manager install.
- 2Review the repository location. Read the README note that the project is moving to inversify/monorepo, and check that repository for the current release.
- 3Get the source. Run the git clone command from the README to fetch the InversifyJS repository.
- 4Read the documentation. Open https://inversify.io to learn the container's features and API before writing code.
- 5Model your classes with constructors. Declare the dependencies each class needs through its constructor so the container can identify and inject them.
- 6Evaluate fit. Compare InversifyJS with tsyringe, awilix or Nest.js DI to confirm it matches your project's needs.
What does InversifyJS do?
An IoC container uses a class constructor to identify and inject its dependencies. Instead of a class creating the objects it relies on, the container supplies them, which makes the code easier to swap and test.
The project says it encourages good object-oriented and IoC practices, such as SOLID design and composition over inheritance. It is a tool to help write that kind of code, not a full application framework.
What are the prerequisites?
The install method listed for InversifyJS is a package manager. The prerequisites are Node.js and npm. The project is written in TypeScript, so a TypeScript setup is the natural fit for its typed API.
- Node.js
- npm
- TypeScript (the project's language; the README targets TypeScript and JavaScript apps)
How do you get the InversifyJS source?
The README gives a git clone command for the repository. Note that the README says InversifyJS is moving to the inversify/monorepo repository, and future releases will be published there. Consider opening issues and pull requests in the monorepo.
- Check https://github.com/inversify/monorepo for the latest location before you start.
- Documentation is available at https://inversify.io.
git clone https://github.com/inversify/InversifyJSWhich problems does it suit best?
InversifyJS is a good match for TypeScript developers who want structured dependency injection in Node.js back-end code. Teams that follow SOLID or composition-based design also benefit from the container model.
The project lists low runtime overhead as one of its goals, so it may suit developers who care about a small footprint. Its README assumes familiarity with OOP and IoC patterns, so beginners should learn those concepts first.
- Structured dependency injection in Node.js back-end code
- Teams following SOLID or composition-based design
- Developers who want a small runtime footprint
What should you know before you adopt it?
InversifyJS only provides the injection container. You will need to build the rest of your application structure yourself.
Because the project is moving to the monorepo, active development for this repository is happening elsewhere. Plan for that when you report bugs or contribute.
- It is not a complete application framework.
- Development is moving to inversify/monorepo.
- The README is written for readers already familiar with OOP and IoC.
What are the alternatives?
Comparable options named in this context include tsyringe, awilix and the built-in DI in Nest.js. Choose based on whether you want a standalone container, a lightweight functional approach, or DI bundled inside a full framework.
- tsyringe
- awilix
- Nest.js built-in DI
What people use it for
- Structuring a TypeScript Node.js back-end around injected service classes
- Applying SOLID and composition-based design in a team codebase
- Keeping a small runtime footprint while using dependency injection
Frequently asked questions
Is InversifyJS free to use?
Yes. InversifyJS is licensed under the MIT License, which permits use, copying, modification and distribution of the software, including commercially, subject to the license conditions.
What do I need to install InversifyJS?
The listed prerequisites are Node.js and npm, and the install method is a package manager. The README also provides a git clone command for the repository.
Does InversifyJS work with JavaScript as well as TypeScript?
The README describes it as a container for TypeScript and JavaScript apps, including Node.js. It is written in TypeScript, so typed projects are the most natural fit.
Where has InversifyJS development moved?
The README says InversifyJS is moving to the inversify/monorepo repository. Next releases will be published there, so issues and pull requests should be opened in the monorepo.
What are good alternatives to InversifyJS?
Projects mentioned for comparison include tsyringe, awilix and the built-in dependency injection in Nest.js. Each suits a different project shape, so compare them against your needs.
Is InversifyJS a full framework?
No. The project provides only the injection container itself. You need to build or choose other parts of your application yourself.
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Our verdict
InversifyJS suits TypeScript developers building structured Node.js back-end code who already understand OOP and IoC and want a container that encourages SOLID design. Developers who want a complete framework, beginners new to dependency injection, or teams that need active development in this repository should look at Nest.js, tsyringe or awilix instead, or check the monorepo first.
Install options & downloads