Response was not JSON: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

[ash-hashtag]

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Response was not JSON: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

It happens sometimes, I didn't find out exact reason, after pressing run something to do with println! in while loop?

[HipHopHuman]

This happens for me on every code snippet consistently, using Opera GX if that helps. EDIT (more info) it appears that this problem happens on the domain "https://play.rust-lang.org/" but not on "https://play.integer32.com/" (that one works fine). This is also affecting every example on https://tourofrust.com

[JonahPlusPlus]

Just happened to me on https://play.rust-lang.org/, but https://play.integer32.com/ worked fine.

[shepmaster]

For the incident starting around 2023-03-15, lets track it in #910

[shepmaster]

This issue is more about handling the sporadic rare error we get from normal, expected server restarts.

[RalfJung]

I'm now seeing this error again for all attempts of building/running something on the playground.

[VDFOREVER]

Same problem, but I was able to fix it, I went to https://play.rust-lang.org/ with vpn and then turned off vpn and rust-playground started working everywhere

[dcabanis]

Getting the same problem today on various browsers (Chrome, firefox, edge):

JSON.parse: unexpected character at line 1 column 1 of the JSON data

or

Unexpected token '<', "<!DOCTYPE "... is not valid JSON

This is the second time I have this problem in 3 weeks.