How do I concatenate two or more JSON objects?

I have multiple JSON objects with shared and optional keys. I need to combine all this objects in one so all nested values would be merged (in case of an array/object) or rewritten (for primitives). Is there a way to do this avoiding loops, like we have Array.prototype.concat() in js?

Seems like this does not solve my problem. Set JSON overwrites all values just like Parse does.

There are lots of solutions on stackoverflow, but all easy methods like Object.assign(json1, json2) overwrite arrays instead of merging them.

stackoverflow.com/questions/21450060/how-to-join-two-javascript-objects-without-using-jquery

stackoverflow.com/questions/433627/concatenate-two-json-objects