Fast Javascript Bundler

The bundler who doesn't get in your way

Fast JavaScript Bundler

Compile and test


It is what it says it is.
However, this bundler aims to be a monolithic does-it-all type of bundler; with zero configuration needed. (however, optional configuration will be supported)


  1. A bundler should not need excessive attention.
  2. A bundler should not get in the way of a developers workflow.
  3. A bundler should be fast.
  4. A bundler should not be written in JavaScript / Node.
  5. Commonly used features among JS developers should be supported out of the box.
  6. The output of the bundler should work everywhere. (to an extent which is possible of course)

More About the Philosophy

Output formats

Most bundlers allows you to select an output format of the code, such as: "CommonJS", "AMD", "System", "UMD", "ES6", "ES2015" or "ESNext" FJB does not implement this concept.
Instead, FJB adapts the code automatically through static analysis.
FJB aims to generate code that works everywhere (when possible).
A bundler should be smart enough so that the developer can focus on other things. :brain:

How does one use it?

bash fjb index.js

What if I want the output in a file?

bash fjb index.js > dist.js


  • [x] Being fast
  • [x] ES6 module imports / exports
  • [x] Aliased imports
  • [x] Wildcard imports
  • [x] JSX support
  • [x] TypeScript support (currently unstable and under development)
  • [x] Importing JSON
  • [x] Importing CSS
  • [x] Importing & transpiling SCSS
  • [x] Automatic JSX format detection
  • [x] Plugin support
  • [x] Removing dead code (Tree shaking)
  • [x] Supports package.json

Planned Features

  • [ ] Lazy imports


Below is an example of some code that is 100% supported.
(Without any plugins or configuration)

For more examples, have a look at: * ./examples * ./tests/src/test_projects

Benchmarks :rocket:

To see benchmarks, have a look at :fire:
You can also view them over at

Installing the easy way

Using apt

The easiest way to install FJB is to head over to releases and download a .deb file that suits you.
Then you can simply run: bash sudo apt install ./<filename>.deb

Installing the complicated way


To build fjb you will need the following: 1. A C compiler (I would suggest gcc) 2. Git

Steps to Install :wrench:

Compiling it

  1. Clone down the repository
  2. Run: bash ./

    This step will generate a fjb.out executable file.
    You can start using this right away. :tophat:

Installing globally

To continue and install fjb globally: Run: bash make install Also make sure you add $HOME/.local/bin to your PATH.

Questions and Answers :question:

How fast is it?

Have a look at :fire:

How serious is this?

Not sure, it's just a hobby project at this point.

Why are you making this?

Frustration, frustration with existing tools.
The existing alternatives are not fast enough, and gets in the way a bit more than they should.

Is it mature enough to use it with React?

You can definitely bundle React apps with FJB.
However, there might be some missing features / bugs since the JSX implementation in FJB is pretty new.
You can see a working React example here

Should I use it?

I will not encourage anyone to use it, but feel free to do it.

Does it work on Linux?


Does it work on Windows?

Probably not, but feel free to make a pull-request with the required changes for it to work.

Does it work on MacOS?

Probably. I haven't tried it, but I would definitely think so.

Can I contribute?

Yes you can. Simply fork it and start making pull-requests.

How do I create a plugin for it?

Have a look at this guide

Will you add support for writing plugins in JavaScript?

No. I don't think JavaScript belongs in a bundler.
The reason why most bundlers today are slow, is because they are written in JavaScript.

What if I find a bug?

If you find a bug, please report it here:

Does it support TypeScript?

Yes, but this feature is under development... so expect bugs.

How do I change the JSX format?

There's no need to worry about that, FJB knows if you're using React or not, and automatically takes care of it for you.

What license is FJB under?


I'm having problems installing FJB

Feel free to create an issue here, and I'll be able to help you.

Can I become a collaborator?

I would prefer if you make pull-requests through forking at first.
Once I've seen that you've made valuable contributions, you might be able to be added as a collaborator.

Please note that the content above is from the over at Github, it might be slightly broken.