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JSON is actually implemented entirely in Crystal for Crystal, I'm pretty sure it's the same for Nim too.

For a language which claims to be fast, having to use a C-based JSON parser would be a bit of a cop-out :)

But using an existing parser that happens to be written in C could definitely be sensible.

That sounds like a pretty awful idea. If you're using a C library for parsing JSON then you must add an additional C to Nim/Crystal conversion step that requires additional RAM and CPU time.

Nim compiles to C, there is no cost in calling C.

That's not how people use C libraries.

thats not how it works

Yes, we do so for more complex formats like YAML and XML. However, for JSON, reimplementing is worth it for binary portability.

it still compares algorithm implementation, not the language speed.

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