JWT Authentication in Node.js - A Complete Beginner Guide With Code
When I first tried to understand JWT authentication, every article I found either assumed I already knew what a token was or buried the actual impleme…
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[Dev Log][Node.js] Feedly Classic is gone, so I built my own FeedFlow (Part 1)
Introduction: Since Feedly's redesign, I haven't been able to get used to the interface. I especially miss the high-density, single-column, no-nonsens…
Private avatars in a Node.js SaaS: which object storage, and how to sign downloads
Use a private bucket with short-lived presigned URLs when an avatar belongs to exactly one user, and reach for a public CDN-backed bucket only when th…
Picking a text-to-image API for a SaaS app: REST, pricing, and safety
If you just want the recommendation: call a plain REST image generation endpoint from your Node.js backend, keep the prompt-in / image-out path as dum…
Poland's e-invoicing system has no JavaScript SDK, so I published the validation layer
Poland runs a national e-invoicing system called KSeF (Krajowy System e-Faktur). Business-to-business invoices are submitted to a government API in a …
What a forged bank statement looks like at the byte level
I spent a chunk of my career in KYC/AML and document verification, mostly looking at things people had uploaded hoping nobody would look too closely —…
How I Built a CLI That Generates 12 Project Templates in 30 Seconds
How I Built a CLI That Generates 12 Project Templates in 30 Seconds When I started building ScaffoldX , I had a simple goal: create a CLI tool that ge…
Alibaba's Open-Code-Review: A Game Changer for Code Quality?
I saw this release from Alibaba on GitHub: alibaba/open-code-review . As someone who's spent years wrangling code quality in large Web2 systems and no…
NestJS v12.0 vs. Ditsmod v3.0: Application Lifecycle and Graceful Shutdown (Part 5)
Welcome to Part 5—the grand finale of our "NestJS v12.0 vs. Ditsmod v3.0" series! Over the last four articles, we have unpacked the strict Dependency …
That CORS error? It wasn't my code
I learned something interesting while debugging Apache, Express, and CORS. Seeing a CORS error in the browser doesn't necessarily mean your Express CO…
Streaming Long AI Jobs to the Browser: SSE Patterns From Building an Audit Tool
The first version of the spectr-ai web frontend had a spinner. You uploaded a contract, the spinner spun, and several minutes later results appeared, …
NestJS v12.0 vs. Ditsmod v3.0: Dynamic Modules, Providers, and the Power of Extension Groups (Part 3)
Welcome to Part 3 of the "NestJS v12.0 vs. Ditsmod v3.0" series! In our previous articles, we explored the strict Dependency Injection hierarchies and…
NestJS v12.0 vs. Ditsmod v3.0: A Deep Dive into Node.js Framework Architectures (Part 1)
If you are building enterprise-grade Node.js applications with TypeScript, chances are you are already deeply familiar with NestJS . It has become the…
🚀 Backend Internals #6: The Node.js Event Loop Explained — Why Async Code Doesn't Block
By Krati Joshi If you've ever wondered how Node.js can handle thousands of requests while running on a single JavaScript thread , the answer is the Ev…
Elixir vs Node.js: Why Developers Are Exploring Elixir for Modern Backend Systems
Modern backend development has been dominated by JavaScript runtimes like Node.js for many years. Node.js changed the way developers build web applica…
The Most Useful Support Agent Is the One That Cannot Send
An AI support demo can look complete after one successful exchange: a message arrives, the model chooses a tool, and a polished answer appears. The un…
🔄 The JavaScript Event Loop: From "What?" to "Oh, NOW I Get It!" (A Deep Dive)
The most misunderstood part of JavaScript — finally explained with analogies, diagrams, and zero hand-waving. If you've ever wondered why setTimeout(f…
Node.js 26.5.0: What's New for Web Streams and Error Handling
I saw the Node.js 26.5.0 release announcement the other day, and as someone who's spent years wrestling with I/O and data processing, a few things imm…
ML Without Magic: Building a Tiny Language Model in Pure Node.js and Watching Every Weight Change
Tokenization → embeddings → causal Transformer → LM head → softmax → loss → backpropagation. No TensorFlow, no PyTorch, and no hidden autograd. Reposi…
You Might Not Need Kafka: Building a Job Queue with PostgreSQL
It's easy to reach for the popular tool before asking what your system actually needs. For job queueing, the usual advice is to use RabbitMQ or Kafka.…
🚀 Backend Internals #4: exports vs module.exports — What's the Difference?
Most Node.js beginners think these are interchangeable: exports . sayHi = () => console . log ( " Hi " ); module . exports = () => console . log…
How I Built a Free AI Prompt Library With Node.js and PostgreSQL — From Zero to Live in 30 Days
If you have been following my Dev.to articles, you know I built Chatzyo — a real-time video chat platform using WebRTC. That project taught me a lot a…
Arrays Explained from Memory to Big O (With Real Benchmarks)
This Loop Should Delete Three Items. It Deletes Two. scores = [ 45 , 30 , 88 , 92 , 15 , 67 ] for score in scores : if score < 50 : scores . remove…
From JavaScript to Node.js: Understanding What Really Happens Behind the Scenes (Part 4.1)
Node.js Modules Explained from Scratch — Why Do Modules Even Exist? If you've been writing Node.js for even a few days, you've probably seen code like…
From JavaScript to Node.js: Understanding What Really Happens Behind the Scenes (Part 3)
From JavaScript to Node.js: Understanding What Really Happens Behind the Scenes (Part 3) Synchronous vs Asynchronous Node.js: What Really Happens Insi…
Structured Logging for Node.js
In Monitoring a SaaS in Production we wired up metrics and alerts so the team knows something is wrong within minutes of it happening. Metrics tell yo…
Feature Flags and Safe Rollouts
In Audit Logs You Can Trust , we built a system that answers "who changed what, and when." Feature flags answer a related question: "who gets to see t…
Caching Strategies for a SaaS
In Disaster Recovery and Backups , we made peace with the database disappearing entirely: accept it can happen, and make recovery boring and rehearsed…
The Bug Only Happened After I Switched LLM Providers
The request succeeded. The response was valid JSON. The SDK did not throw an exception. And the application still broke. The bug appeared after I swit…
Stop triaging CVEs that never touch your code
Every serious engineering org runs some form of software composition analysis. And almost every one of them has the same quiet failure mode: the scann…