There are several free options available for hosting a simple JSON file and fetching it. Some popular options include:
GitHub: You can create a re...
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nice concise article
if u want to start with hosting on AWS read this piece
dev.to/rickdelpo1/my-pal-json-shou...
also look here at
dev.to/rickdelpo1/to-sql-or-to-nos...
for example code in plain javascript