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§ Developer blog

Practical articles on JSON, encoding, security, SQL formatting, regex, and developer tool workflows. Written by the Vultio team.

28 articlesupdated regularly

§ 01

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All articles

§How to Debug JSON API Responses Like a Senior DeveloperA practical workflow for isolating broken API responses, reading nested structures, and spotting schema mismatches before they reach production.JSON7 min read→§Base64 Encoding Explained: What Every Developer Should KnowWhy Base64 exists, how the encoding works under the hood, when to use it, and the mistakes that trip up developers every week.Encoding6 min read→§JWT Security Best Practices: What Most Tutorials MissThe JWT pitfalls that most auth tutorials never cover — algorithm confusion attacks, missing expiry, insecure storage, and how to fix each one.Security8 min read→§SQL Formatting in Code Reviews: Why It Matters More Than You ThinkInconsistent SQL style costs more than aesthetics — it hides logic errors, slows reviews, and makes refactoring dangerous. Here is how to fix it.SQL6 min read→§8 Regex Patterns Every Backend Developer Should KnowEight production-tested regex patterns for email, URLs, UUIDs, ISO dates, IP addresses, slugs, phone numbers, and credit card masking.Regex7 min read→§UUID vs ULID: Which Should You Use in 2026?A practical comparison of UUID v4 and ULID for primary keys, distributed systems, and APIs — with concrete advice on when each one wins.Generation6 min read→§cURL Command Cheat Sheet: Every Flag You Actually NeedThe cURL flags developers actually use: sending headers, request bodies, authentication, following redirects, debugging, and saving output — with copy-paste examples.HTTP6 min read→§URL Encoding Explained: When to Encode and Why It MattersWhy URLs have reserved characters, how percent-encoding works, the difference between encodeURI and encodeURIComponent, and the bugs that happen when you get it wrong.Encoding6 min read→§JSON Schema Validation: Catching API Contract Bugs Before ProductionHow JSON Schema works, why it catches API contract violations that TypeScript misses, and how to write schemas for real-world payloads.JSON7 min read→§HTTP Status Codes: A Developer's Complete ReferenceWhat every HTTP status code actually means, when to use each one in your API, and the common mistakes that send clients the wrong code.HTTP7 min read→§Mock Data in API Development: Why Fake Data Beats Real Data in TestsWhy production data is the wrong choice for development and testing, how to generate realistic fake data, and what good mock data actually looks like.Generation6 min read→§XML vs JSON: When to Use Each Format in Modern APIsA practical comparison of XML and JSON for APIs, configuration, and data exchange — with concrete guidance on when each format actually wins.Formatting6 min read→§Generate TypeScript Types from JSON: A Practical GuideHow to turn raw JSON payloads into accurate TypeScript interfaces — automatically or by hand — and avoid the type-drift bugs that hit every growing API.JSON7 min read→§Unix Timestamps Explained: Time, Epochs, and Timezones in PracticeWhat Unix time actually is, why it has an epoch problem in 2038, how to convert timestamps correctly across timezones, and the common bugs that trap developers.Time7 min read→§MD5 vs SHA-256: Choosing the Right Hash Function for Your Use CaseWhen MD5 is still acceptable, when SHA-256 is the minimum bar, and why using the wrong hash function for the wrong job has caused some of the largest data breaches in history.Security8 min read→§API Authentication Methods: API Keys, Bearer Tokens, and OAuth ComparedWhen to use API keys, when Bearer tokens are correct, how OAuth 2.0 flows actually work, and how to avoid the authentication mistakes that cause breaches.Security8 min read→§SQL JOINs Explained: INNER, LEFT, RIGHT, and FULL with Real ExamplesHow every SQL JOIN type actually works, when to use each one, the mistakes that cause missing rows or duplicates, and how to debug unexpected join results.SQL7 min read→§Environment Variables: How to Manage Secrets Without Leaking ThemHow environment variables work, the right way to use .env files across environments, and the concrete practices that prevent secrets from ending up in git history or logs.Security8 min read→§JSON vs YAML for Configuration: Which Format Should You Use?A practical comparison of JSON and YAML for configuration files, CI/CD pipelines, and API schemas — with concrete guidance on when each format creates more problems than it solves.JSON7 min read→§API Rate Limiting: How It Works and How to Handle It GracefullyHow rate limiting algorithms work (token bucket, leaky bucket, sliding window), how to read rate limit headers, and how to implement retry logic that does not make the problem worse.HTTP7 min read→§CORS Explained: Why It Exists, How Preflight Works, and How to Fix ItWhat CORS actually is, why the browser enforces it (but curl doesn't), how preflight requests work, and the correct server-side headers to set without opening security holes.HTTP7 min read→§Database Indexes Explained: How They Work and When to Add ThemHow B-tree indexes speed up queries, why too many indexes slow down writes, how composite indexes work, and the EXPLAIN output patterns that reveal when you need an index.SQL8 min read→§REST API Design: The Conventions That Actually Matter in ProductionURL structure, HTTP method semantics, versioning, error response shapes, and pagination — the REST API conventions that prevent client breakage and debugging nightmares.HTTP8 min read→§Debugging APIs with cURL: The Commands Every Developer NeedsHow to use cURL to diagnose API issues, inspect TLS certificates, test authentication headers, trace redirects, and reproduce exact browser requests from the command line.HTTP7 min read→§WebSockets vs HTTP Polling: Choosing the Right Real-Time PatternWhen WebSockets are the right tool, when long-polling is simpler, when Server-Sent Events are enough — and the performance tradeoffs that determine which pattern fits your use case.HTTP8 min read→§JSON to CSV and Back: Converting Data Formats Without Losing InformationHow to convert JSON arrays to CSV for spreadsheets, how to handle nested objects and arrays during conversion, and the data loss traps that catch developers off guard.JSON7 min read→§Docker for Developers: Containers, Images, and the Commands You Actually UseWhat Docker containers actually are, how images and layers work, the Docker commands that matter in daily development, and how to write a Dockerfile that does not waste build time.DevOps8 min read→§Content Security Policy: Stopping XSS at the Browser LevelHow Content-Security-Policy headers work, how to build a policy that blocks XSS without breaking your site, and how to use report-only mode to roll out CSP safely.Security7 min read→