Check MIME type before parsing responses as JSON

[axelboc]

Addresses #1355 (comment)

I was able to write a wretch add-on for this, which is pretty awesome. 🎉 The add-on adds a method called expectJson to wretch's chainable API (more specifically to the response chain, so after get, post, etc.)

So you can now do: .get(...).expectJson().json() and you'll see something like this:

You have to go down the stack trace a bit to find the location of the problematic fetch call, but I think that's okay.

[elmjag]

Is it possible to include call do the json parsing inside the expectJson function?

It would be nice if we could just do:

return endpoint.get('/beam/info').expectJson();

[axelboc]

Even better, thanks 👍

I called it safeJson, though.

[marcus-oscarsson]

Nice

[marcus-oscarsson]

Thanks @elmjag and @axelboc