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JavaScript

Practical tutorials for the work we actually do. Pick one, read it in order, and apply it.

Any category Programming5 JavaScript 2 TypeScript 3
Any topics APIs and Integrations 2 Data Structures and Algorithms 1 Object-Oriented Programming 2 Packaging and Dependencies 3 Programming Basics 2 Testing and Debugging 5
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JavaScript APIs and Integrations Intermediate Clear filters 2 results
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fetch With Proper Error Handling (It Doesn't Throw on 404)

fetch only rejects when there's no response. A 404 or 500 resolves normally, so check response.ok, add a timeout, and keep the status on the error so the caller can decide what to tell the user.

5 min read
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Fix "Unexpected token in JSON" Errors

"Unexpected token in JSON" means JSON.parse got text that isn't JSON. Read the exact message, log the raw text, and match it to one of five causes. Most of the time it's an HTML error or login page.

5 min read