[hdjrudni]

Could, ya, but I'd be pretty impressed and sad if Rust didn't have really good JSON parsers/serializers by now.

[steveklabnik]

It’s had them for a very long time, pre-1.0.

[adastra22]

What do you mean? It has exceptionally good crates for that, and has for more than a decade. Is there something you feel is missing?

[socksy]

Well exactly, I'm pretty sure that's what the GP is getting at — it would be a surprise if Rust didn't have good JSON support. Which it does. So it's unlikely to be the bottleneck.