Hi,

I am not familiar with form.io, but if form.io allows you to use RES, then you should not have a problem with integrating with K2.

Here are some documentation on enabling and using the REST service in K2:

• Workflow REST Services


• SmartObject REST Services


• (Only in K2 Five) New Workflow REST API

You can use application such as Postman to test the REST services, and once you can get the REST services to work properly, you can consume them in whatever form technology you want. Again, this only work if the form technology you are using can consume REST, and that it has access to the web server that is hosting your K2 web services.