No, the root problem is using an online service for spellchecking when every other decent editor does it locally.
For reference, the hunspell dictionary file used in apps like Libre Office and Firefox is about 400kb. That's effectively the whole of the English language.
You are off by a factor of 1000 or more for cost of spellcheck
Change it from JSON to YAML or canonical s-expressions and you'll have room for even more …
Very useful features for writing code.