Tech Articles
Curated developer articles, tutorials, and guides – auto-updated hourly
Igor Potapenko11h ago • 5 min read
Your idempotency test probably cannot fail
My test for "do not announce the same payment twice" passed. Production sent two identical messages ...
#testing#webdev#postgres#node
6 1
Naufal Hafizh4d ago • 5 min read
I shipped a lock. Then I had to prove it could fail.
This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry. ## The bug that.....
#bugsmash#testing#node#devchallenge
1 0
Seongjin Kang2d ago • 3 min read
I built a forum where rooms die when people stop talking
I got tired of two things about online communities. The first is that they don't die well. A...
#webdev#showdev#sideprojects#node
1 0
José Carlos García1d ago • 14 min read
Transactions in NestJS and TypeORM without passing the EntityManager around
A transaction boundary declared once at the controller, repositories that enlist themselves, and thr...
#nestjs#typescript#node#typeorm
5 0
Ofri Peretz5d ago • 4 min read
Your Token Is Not Safer in a Cookie. It Is Safer From JavaScript.
The localStorage-versus-cookies argument is about the wrong axis. One property decides whether an XS...
#webdev#security#javascript#node
4 1
Bolu Ajayi6d ago • 3 min read
I got tired of console.log debugging, so I built DevTools for my backend
You know the dance. An endpoint is slow. So you open the handler and start...
#node#opensource#javascript#webdev
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Custralis2d ago • 5 min read
The loudest attacks on our Next.js site were aimed at software it never ran
The edge logs of a Next.js site we built: thousands of noisy probes for software it never ran, and t...
#nextjs#security#webdev#node
0 1
Seth Wheeler8h ago • 7 min read
What Maintaining a Forked npm Package Actually Buys
I would have said "eighteen releases of upkeep". What npm audit can see is one digit in a dependency...
#node#security#measurement
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Pablo Albornoz Afanasiev4d ago • 6 min read
Your `if` statements are a database nobody can query
Somewhere in your codebase there is a line that looks like this: if (user.plan === 'enterprise' |...
#architecture#opensource#node#softwareengineering
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Amanullah8h ago • 1 min read
Add Google Authenticator 2FA to your Node app in two steps
Adding 2FA to an app sounds like a weekend of reading RFCs, so most side projects never get it. I...
#javascript#node#security#showdev
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Pedro Rogério4d ago • 7 min read
"half-open" twice is not the same state: the bug that shaped breakwater 1.0
I built a distributed circuit breaker on Redis. Compare-and-set on the state name looked correct and...
#node#distributedsystems#typescript#opensource
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Apurwa-Anand4d ago • 18 min read
I Built a RAG Pipeline in TypeScript Without LangChain — The Whole Thing in 200 Lines
A retrieval pipeline built by hand in six files — the data structures behind each stage, the four bu...
#typescript#ai#node#tutorial
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Cristian Diaz Koziuk4d ago • 5 min read
What actually breaks when you let an LLM execute real actions
What actually breaks when you let an LLM execute real actions I built a control plane that...
#ai#llm#architecture#node
0 1
Seth Wheeler2d ago • 6 min read
Rate Limiting a Crawler Across Node Cluster Workers
Code: Megapixel99/webCrawler This project is a small search engine I wrote to understand how one.....
#concurrency#node#mongodb#crawlers
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Jerome4d ago • 7 min read
Coalescing the Stream
Claude Code, on my box, doesn't talk to a model provider directly. It goes through claude-code-route...
#ai#claudecode#node#debugging
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Angga Bachtiar18h ago • 9 min read
Building a Human-in-the-Loop Autonomous Coding Agent with n8n and Telegram
What if I could send a coding task from my phone, put the phone back in my pocket, and let an AI...
#ai#node#n8n#coding
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Peyman20h ago • 5 min read
From Chatbot to Production AI System: What Changes When AI Meets Real Software
Building a chatbot is surprisingly easy. Building an AI system that belongs inside real production....
#ai#softwaredevelopment#node#llm
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takahiro hashito2d ago • 4 min read
A threshold that filters CVEs is only half a design until zero has two meanings
Introduction I run a site that publishes vulnerability write-ups. Every day a script pulls...
#security#node#automation
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Cna12h ago • 6 min read
Migrating a Node library from polyfilled `Temporal` to Node 26 native `Temporal`
Without breaking Node 24, CJS, or TypeScript 6/7. Node 26 enabled native Temporal by default on...
#javascript#node#softwaredevelopment#tutorial
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Peter Hallander4d ago • 5 min read
If you render user HTML, you have an SSRF problem. Here is the code that fixes it.
Every HTML-to-PDF service has the same shape. Someone hands you markup, you open it in headless...
#security#node#webdev#javascript
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Simon5d ago • 9 min read
CrawlForge v5.0.0: Security, Correctness, MCP Spec
http://2130706433/ is a valid URL. Your browser will happily resolve it to 127.0.0.1, because the...
#mcp#security#node#webscraping
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Ozoemena John1d ago • 7 min read
I Wrote 238 Tests Against My Own Auth Package and Found 4 Real Bugs
I'd already done a lot right by the time I started writing tests for Beaver-Auth. Every module had.....
#testing#node#typescript#opensource
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Pedro Rogério2d ago • 8 min read
My idempotency library had one job. A dropped connection made it run the payment twice.
quayside survived 1,254 dead mutants and an adversarial review. The bug that got through was four li...
#node#typescript#distributedsystems#opensource
0 0
Ashwin Sathian2d ago • 4 min read
Why Better Auth's MongoDB adapter can't populate() a Mongoose ref
If your Node app already uses Mongoose and you wire up Better Auth with its official MongoDB adapter...
#mongodb#node#typescript#mongoose
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