Process 2 JSON files and perform a join between them

[multipliedtwice]

Hello, I have 2 large JSON files. Each file contains an array of objects with a relation by ID.

How can I read 2 files and join them into one output?
Or read one file, then for each iteration, perform a join.

[uhop]

Some time ago I created a helper for a specific case: stream-join. See if it fits your needs. At the very least it can be used as a source for a different joiner.

It does a simple thing: takes an array of Readables, runs a function on an array of their current values, and produces a Readable with the result. The input Readables can be produced using tools of stream-json. The output Readable is usually serialized. If you want to serialize it as JSON it can be done using stream-json's tools.