Why do I get "Response was not JSON" on the Rust Playground? [closed]

Question

I am trying to run a simple hello world program on the Rust Playground:

fn main() {
    println!("hello");
}

But all I get is an error:

Response was not JSON: SyntaxError: The string did not match the expected pattern.

What is going on?

Answer 1

This appears to be the symptomatic message displayed if the server-side of the Rust Playground is unresponsive, likely due to either updates or overloaded usage. There isn't much you can do beyond waiting for it to become responsive.

There is a mirror site here (by the playground's primary developer).