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Locally, I attempted to complete the first challenge in “How to Use package.json, the Core of Any Node.js Project or npm Package.” I added the author field correctly, but when I paste my localhost link, I still fail the test.
“localhost” is just that, a “local host”. It is a server that is running locally on your machine. The test cannot reach it because it is out on a different server and has no access to your local server. For the test to run, it needs access to your code running on a server out on the internet. Using replit is one of the easiest ways to do that. It is mentioned in the challenge description.