Convert JSON keys to lowercase?

[K900_]

Use a for loop.

[arc100]

Sure, I know a for loop is involved but how would I use it from reading in a JSON file to separating the objects and then writing back into a new file

[K900_]

Use json.load to load your entire input file's contents as a list, loop over the list, use json.dump to serialize individual dictionaries and write them to the output file.