Fusion.js vs Fielder: What are the differences?

Developers describe Fusion.js as "Modern framework for fast, powerful React apps". It is a modular javascript framework for creating plugin-based React applications. It gives you the developer experience you expect from a React/Redux setup and provides tools to take project quality to the next level. On the other hand, Fielder is detailed as "A field-first form library for React and React Native". Fielder has been built from the ground up with a field-first approach to validation What does this mean?

• Validation can easily be added and removed to a form
• Only validate what the user can see (see cross form validation below)
• No need for a large set of upfront domain knowledge.

Fusion.js belongs to "Frameworks (Full Stack)" category of the tech stack, while Fielder can be primarily classified under "Javascript UI Libraries".

Fusion.js is an open source tool with 1.25K GitHub stars and 120 GitHub forks. Here's a link to Fusion.js's open source repository on GitHub.