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36 items on 07 Oct 2026
JavaScript AI

Validate LLM Output: Catching AI-Invented Emoji

If an LLM generates structured output for your product, any string it emits can be fiction, and "looks right" is not validation. On my site emoji-combos.net, a language model drafts decorative emoji combos for bio text,…

Source: DEV JavaScript feed Mr.Rain
JavaScript

How QR Code Tracking Works: A Complete Guide for Businesses

QR codes have become an important bridge between offline and digital marketing. Businesses use them on product packaging, business cards, restaurant menus, posters, advertisements, event materials, and promotional…

Source: DEV JavaScript feed TrackYourQR
JavaScript

Gadget Replacement Calculator

“Should I replace this device?” sounds like a price comparison, but a cheap upgrade can still be a poor decision if the current device is inexpensive to keep or the new device carries a large manufacturing footprint. I…

Source: DEV JavaScript feed Joe Lin
JavaScript

Your Console Screenshot Shows Values That Never Coexisted

Three lines, from MDN's own documentation for console: const obj = {}; console.log(obj); obj.prop = 123; That logs {}. Expand the object in the console afterwards and you see prop: 123. MDN states the mechanism plainly:…

Source: DEV JavaScript feed Vladimir Elchinov
JavaScript

Web components failed. We can fix them.

In 2004, the W3C was betting HTML's future on XHTML 2: a stricter, XML-based language that wasn't backward compatible with the web people had actually built. Apple, Mozilla, and Opera disagreed, and formed the WHATWG to…

Source: DEV JavaScript feed Matthew Dean
JavaScript

What is JSON in JavaScript?

JSON stands for JavaScript Object Notation. JSON is a lightweight data format used to store and exchange data between applications, especially between a frontend and backend/API. Example: { "name": "Sathish", "age": 24,…

Source: DEV JavaScript feed SATHISHKUMAR R
JavaScript

What is fetch() in JavaScript?

fetch() is a built-in JavaScript function used to send HTTP requests and get data from a server/API. It is commonly used to connect a frontend application with a backend or external API. Flow Chart: JavaScript ↓ fetch()…

Source: DEV JavaScript feed SATHISHKUMAR R
JavaScript

What is an API in JavaScript?

API stands for Application Programming Interface. In JavaScript, an API allows your application to communicate with another application or server and exchange data. Example: JavaScript Application ↓ API ↓ Server ↓ Data…

Source: DEV JavaScript feed SATHISHKUMAR R
JavaScript AI

"LLM streaming works in the demo. These 4 hops break it in prod"

Words appear one by one on localhost, and LLM streaming looks done. In production the answer lands in one lump, the model keeps generating after the user leaves, and half a sentence shows up as the full answer. None of…

Source: DEV JavaScript feed Ajay Vishwakarma
JavaScript

What is foreach() in Javascript?

forEach() is an array method used to execute a function once for every element in an array. (or) forEach() is an array method that executes a callback function once for each element in an array. Example: let numbers =…

Source: DEV JavaScript feed SATHISHKUMAR R
JavaScript

worth a read

🐍 Snake - rendered with 576 browser windows [warning - this WILL hurt your eyes...and PC!] Explores browser popup API abuse GrahamTheDev GrahamTheDev GrahamTheDev Follow Jul 23 🐍 Snake - rendered with 576 browser…

Source: DEV JavaScript feed ضاحك الشايع
JavaScript

What is JavaScript (JS)?

JavaScript (JS) is a programming language used to make web pages interactive and dynamic. HTML creates the structure, CSS creates the design, and JavaScript adds behavior and functionality. Example: let name =…

Source: DEV JavaScript feed SATHISHKUMAR R

36 items available