SQLite is ideal for heavy read and write operations. It's lightweight, has complex queries' ability, and maintains your data safe as well as consistent. Thus, it is the best choice for applications that update or retrieve a great deal of data often, be it web apps or data-heavy software.
JSON files are suited for situations in which one reads and writes data only once, or at best, very rarely. They are mostly read and written by people for configuration settings or simple data sharing purposes. However, if one is expecting to have many updates or dealing with huge amounts of data, then JSON becomes unwieldy as one would have to load and rewrite the whole file every time.
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