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JavaScript help

Questions about JavaScript and TypeScript.

Every post is reviewed first. Usually reviewed within 24 hours.

Accepted
How do I debug 'TypeError: Cannot read properties of undefined (reading ...)' in JavaScript?
dev31 day ago
#javascript #errors #debugging
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1
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How do I fix 'Unexpected token < in JSON at position 0' when using fetch?
dev32 days ago
#javascript #json #fetch #errors
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1
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0
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Why does await inside forEach not wait in JavaScript?
dev37 days ago
#javascript #async #await
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1
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0
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How do I write a JavaScript regex to match and extract parts of a string safely?
dev39 days ago
#javascript #regex #strings
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1
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0
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How do I fix 'Cannot use import statement outside a module' and 'require is not defined' in Node.js?
dev310 days ago
#javascript #node #modules #esm
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1
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0
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Where should I store a JWT in a JavaScript web app: localStorage or cookies?
dev312 days ago
#javascript #security #jwt #cookies
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1
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0
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Why does my async function return a Promise object instead of the value?
dev316 days ago
#javascript #async #promises
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1
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0
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What is the JavaScript event loop and why do promises run before setTimeout?
dev317 days ago
#javascript #event-loop #promises
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1
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0
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How can I safely fetch a URL provided by a user in Node.js?
dev322 days ago
#javascript #node #security #ssrf
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1
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0
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What is the best way to deep clone an object in JavaScript?
dev323 days ago
#javascript #structuredclone #objects
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1
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0
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What is the difference between Promise.all, allSettled, race and any?
dev326 days ago
#javascript #promises
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1
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0
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How does `this` work in JavaScript and why is it undefined in my callback?
dev329 days ago
#javascript #this #functions
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1
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0
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Should I use type or interface in TypeScript?
dev39 Oct 2026
#typescript #types #interface
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1
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0
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What is the difference between ?? and || in JavaScript, and when do I use ?.?
dev38 Oct 2026
#javascript #operators #nullish
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1
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0
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When should I use map, filter, reduce, find and flatMap on arrays?
dev36 Oct 2026
#javascript #arrays #map #filter
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1
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0
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How do I narrow types in TypeScript when a value is `unknown` or a union?
dev35 Oct 2026
#typescript #narrowing #types
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1
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0
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How do I write a debounce function in JavaScript, and what is the difference from throttle?
dev31 Oct 2026
#javascript #debounce #performance
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1
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0
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How do generics work in TypeScript? I do not understand `<T>`.
dev330 Sept 2026
#typescript #generics
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1
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0
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Why does new Date('2025-03-10') give the wrong day in JavaScript?
dev330 Sept 2026
#javascript #date #timezone
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1
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0
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How do I store objects and arrays in localStorage correctly?
dev325 Sept 2026
#javascript #localstorage #browser
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1
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