A 15MB json file is more like a mini database, it'd be faster to run a quick script to import it in a nosql json database and then query from there. It may take 5 minutes but then you won't want to throw yourself out of the window when trying to edit/query it.
There's no technical reason you shouldn't be able to happily scroll through (and edit) a 15MB json file; and search for an arbitrary string should take ~10ms (ballpark from playing around with ripgrep just now), certainly not slow enough to merit big up front indexing costs.
I could open a 15mb file in Eclipse 10 years ago. Idk why we're reinventing the wheel when we have flying cars. If you're not just using a JetBrains editor then you're being a masochist.
