Blog
Developer guides, tutorials, and tips from the DevWithTools team
Practical articles on APIs, system design, security, AI development, and developer tools. Written for developers who want to understand how things actually work.
50 articles and growing
RAG Explained for Developers
Learn how RAG works, when to use it over fine-tuning, and how to implement it with Node.js and vector databases.
AI Context Windows Explained
Understand AI context windows, tokenization, and strategies for managing token limits with code examples.
Prompt Engineering for Developers
Master prompt engineering techniques — zero-shot, few-shot, chain-of-thought, and structured outputs with API examples.
AI Agents vs AI Workflows
Understand the key differences between AI agents and AI workflows, when to use each, and hybrid approaches.
MCP (Model Context Protocol) Explained
Learn how MCP (Model Context Protocol) works — the open standard for connecting AI models to external tools and data.
CAP Theorem Explained Simply
Understand CAP theorem simply — consistency, availability, partition tolerance, and how real databases make the tradeoff.
Horizontal vs Vertical Scaling
Scale up or scale out? Learn when to use each approach with real-world examples and cost comparisons.
Database Indexing Explained
How database indexes work, when to add them, types of indexes, and PostgreSQL/MySQL code examples.
Redis Explained for Developers
Learn Redis from the ground up — data structures, caching, sessions, rate limiting, pub/sub, and clustering.
Message Queues Explained
Compare RabbitMQ, Kafka, SQS, and BullMQ. Learn when to use each with code examples and decision guides.
Idempotency in APIs Explained
Why idempotency matters, how to implement idempotency keys with Redis, and how Stripe handles it.
Caching Explained (All 4 Layers)
Complete guide to caching at every layer — browser, CDN, server, and database with Redis code examples.
CDN Explained
How CDNs work, caching strategies, invalidation, popular providers compared, and real performance numbers.
Reverse Proxy vs Load Balancer
Understand the difference between reverse proxies and load balancers, when to use each, and Nginx configs.
API Gateway Explained
What API gateways are, core features, popular options compared, patterns, and when NOT to use one.
SSE vs WebSockets
Compare Server-Sent Events and WebSockets — direction, protocol, reconnection, and when to pick each.
WebSockets vs HTTP
When to use real-time WebSocket communication vs standard HTTP request-response.
Cookies vs Local Storage vs Session Storage
Compare cookies, localStorage, and sessionStorage — security, size, persistence, and JWT storage.
HTTP Methods Explained
Complete guide to GET, POST, PUT, PATCH, DELETE, HEAD & OPTIONS with comparison table and code examples.
CORS Explained
Everything about CORS — how it works, preflight requests, headers, common errors, and how to fix them.
Regex Cheat Sheet: 50+ Patterns
50+ copy-paste ready regex patterns for validation, parsing, and text manipulation.
Webhooks Explained
How webhooks work, security patterns (HMAC), retry logic, idempotency, and building reliable receivers.
API Versioning Best Practices
API versioning strategies, migration playbook, and common mistakes to avoid.
Rate Limiting Explained
Rate limiting algorithms, HTTP 429, Redis implementation, and client-side retry handling.
API Authentication Methods
Compare API Keys, JWT, OAuth 2.0, Basic Auth, HMAC, and mTLS — when to use each.
HTTP Status Codes Explained
Every HTTP status code explained with examples, framework code, and debugging scenarios.
Content-Type vs Accept Header
The difference between Content-Type and Accept headers with MIME types and content negotiation.
HTTP Response Headers Explained
Every response header covered — caching, security, CORS, cookies, and 30+ headers with examples.
HTTP Request Headers Explained
Complete guide to request headers — Authorization, Content-Type, Accept, CORS, and more.
REST vs GraphQL
Compare REST and GraphQL — performance, caching, flexibility, and a decision guide.
What Is a REST API?
Learn what REST APIs are, how they work, HTTP methods, endpoints, and best practices.
OAuth 2.0 vs JWT
OAuth is a framework, JWT is a token format — understand how they work together.
JWT Access Token vs Refresh Token
The difference between access and refresh tokens — security, storage, rotation, and implementation.
JWT vs Session Authentication
Compare JWT and session authentication — architecture, security, scalability, and code examples.
JSON vs XML vs YAML
Compare JSON, XML, and YAML — syntax, performance, use cases, and when to choose each.
JSON.parse() vs JSON.stringify()
JSON.parse() vs JSON.stringify() — deep dive with edge cases, reviver functions, and best practices.
How AI Coding Agents Work
How AI coding agents work — LLMs, planning engines, memory systems, and autonomous workflows.
What Is JSON and How to Format It
Complete guide to JSON — syntax, data types, common errors, formatting, and API usage patterns.
Base64 Encoding Explained
How Base64 works, when to use it, and common mistakes — it's about compatibility, not security.
How to Create Strong Passwords
Password security guide — generators, hashing (bcrypt/Argon2), MFA, and NIST recommendations.
URL Encoding Guide
Why URLs need encoding, how percent-encoding works, and debugging URL encoding issues.
Understanding JWT Tokens
JWT structure, claims, signature verification, security attacks, and production implementation.
Hash Functions Explained
SHA-256, MD5, bcrypt, Argon2 — when to use each, comparison table, and common mistakes.
UUID Guide
UUID versions explained — v4, v7, database performance, and alternatives (ULID, NanoID, Snowflake).
Regex Guide for Developers
Learn regex — syntax, character classes, quantifiers, lookaheads, and cross-language differences.
JavaScript Minification Guide
JS minification — Terser, esbuild, bundle optimization, and measuring impact with build tools.
CSS Minification Guide
CSS minification — cssnano, PurgeCSS, critical CSS extraction, and performance optimization.
Unix Timestamps Explained
Unix timestamps — conversion, seconds vs milliseconds, timezone pitfalls, and API best practices.
CSS Color Formats Guide
CSS color formats — HEX, RGB, HSL, when to use each, and building design system color scales.
QR Codes Explained
How QR codes work, error correction, generating in code, and data types beyond URLs.
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