Very neat project! I think visibility into intermediate stages of a pipeline can be enormously useful for data restructuring tasks, where the individual steps aren't necessarily "difficult" to understand, but it can be hard to keep track of what's going on without a good feedback loop.
Here's a demo of a prototype live programming environment I made for jq, which similarly shows step-by-step views of the data but also gives live feedback as you construct your pipeline:
By the end of that Twitter thread I ultimately morphed it into a tool for building interactive GUIs (eg, get API data in JSON, use jq to morph it into the right shape for your UI, output to a HTML template).
Here's a demo of a prototype live programming environment I made for jq, which similarly shows step-by-step views of the data but also gives live feedback as you construct your pipeline:
https://twitter.com/geoffreylitt/status/1161033775872118789
By the end of that Twitter thread I ultimately morphed it into a tool for building interactive GUIs (eg, get API data in JSON, use jq to morph it into the right shape for your UI, output to a HTML template).