How to use jq in linux for multiple files?

I am trying to convert SAFECAST API JSON to a CSV suitable for spreadsheet programs like Excel etc. to prepare some data summaries etc. I have semi-manual WGET script to download several JSON files based on my filters.

I am able to convert single JSON to usable CSV using jq (Ubuntu linux):

cat bgeigie_imports_001.json |  jq -r '["id", "user_id", "source url", "status", "submitted", "measurements_count", "approved", "created_at", "updated_at", "name", "description", "lines_count", "credits", "height", "orientation", "cities", "subtype", "rejected"], (.[] | [.id, .user_id, .source.url, .status, .submitted, .measurements_count, .approved, .created_at, .updated_at, .name, .description, .lines_count, .credits, .height, .orientation, .cities, .subtype, .rejected]) | @csv '> bgeigie_imports_001.csv

but I am unable to make it work automatically and convert all json files in the folder (this thread did not help).

any ideas? Loading the file names for input/output from a txt file might also help as I have a list from the wget script...

appreciate any advice, unfortunately my skills are limited

thanks

PS: merging the json first using jq -s '.' *.json > All_data.json produces somehow different file and the jq command above fails to work properly