Datasette provides an instant, read-only JSON API for any SQLite database, even those applications on your system maintain. It also provides tools for packaging the database up as a Docker container and deploying that container to hosting providers such as Zeit Now. Got CSV data? Use csvs-to-sqlite to convert them to SQLite. Runs its own webserver on localhost:8001 so you don't need to write code to use it, just point it at a .sqlite3 file.
Requires Python 3.