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$ curl repovive.com/roadmaps/javascript/getting-started/reading-error-messages

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$ curl repovive.com/roadmaps/javascript/getting-started/reading-error-messages

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Reading Error Messages - Getting Started | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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Reading Error Messages

Understanding what went wrong

When your code fails, you'll see an error in the console. An error message has $3$ parts: the error type, the message, and the location.

ReferenceError: userName is not defined
    at script.js:5:13

This tells you: it's a ReferenceError, the variable userName doesn't exist, and the problem is on line $5$ , column $13$ of script.js. Read the full message before trying fixes.