Formst is a simple and performant library for creating forms in React running on Mobx-State-Tree. It comes with all the goodness of MobX-State-Tree and makes your thought process data-first while building forms.


While working on a recent project, GeekyAnts devs realised that there was no easy way to build forms for React apps. Yes, there are solutions available but they're not quite optimal. Some are slow and don't provide a satisfactory UI while others have a steep learning curve. Devs still face unsolved problems like interdependency between form fields and nested forms.

So, we decided to take matters into our own hands. We built a library based on MST that includes commonly used functionalities required in any form, such as validations and pre-processing.

Introducing Formst: A Model-driven Form Library for React ๐Ÿ™Œ๐Ÿผ


When it comes to building forms, Data-First > UI-First

We realised that we could simplify the form-building process by looking at the data and UI parts separately. Later, these can be integrated with a few lines of code. Here's a few advantages of using a model-driven approach:

  • State-management becomes much easier when you separate business logic from the UI
  • Testing is much simpler since your logic and UI have been decoupled

For more information, check out UI as an afterthought.

Use Cases#

This can be used with all sorts of forms: nested, stepper and flat. The only constraint is that Formst has the following dependencies: mobx, mobx-react/mobx-react-lite and mobx-state-tree. Ultimately, this works best with applications that use these as their state management solution.

When not to use#

Formst was specifically built for applications running on MST(MobX-State-Tree). If MST is not your default state management solution, you will need to account for extra bundle size and this package may not be for you.