EvvyTools Blog
Smart guides, how-tos, and tool deep dives. Better decisions start with better understanding.
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Tool Deep Dives
How to Debug JWT Authentication Errors Using a Token Decoder
JWT authentication errors are hard to read from error text alone. Decoding the token directly reveals the expired claim, algorithm mismatch, or signature failure causing the problem.
Tool Deep Dives
How Cryptographic Hash Functions Work: MD5, SHA-1, SHA-256, and SHA-512 Explained
What makes SHA-256 more secure than MD5, how hash algorithms work under the hood, and which one your project actually needs.
Tool Deep Dives
How DNS Lookups Diagnose Email Deliverability Issues
Use DNS lookups to inspect MX, SPF, DKIM, and DMARC records before sending email, and catch the configuration problems that trigger spam filters.
Tool Deep Dives
UUID Generator: How UUIDs Work and Which Version to Use
A practical guide to UUID versions, how they are generated, and which one fits your database, API, or distributed system.
Tool Deep Dives
Text Encoding Explained: Base64, URL & HTML Entities
From Base64 to JWT decoding, this guide covers every text encoding format developers encounter and explains exactly when to use each one.
Tool Deep Dives
CSS Generator: Gradients, Box Shadows and Glassmorphism Without the Syntax Headache
CSS gradients, box shadows, and glassmorphism effects are easier than you think. Here's how to generate each one visually without guessing syntax.
Tool Deep Dives
How to Audit Your HTTP Security Headers and Fix What Is Missing
HTTP security headers are the fastest configuration wins in web app security. Here is how to check yours and fix what is missing.
Tool Deep Dives
How to Write Regex Patterns That Work in Production (Not Just in Tutorials)
A practical guide to writing regex patterns that work, with real examples for email validation, URL parsing, and more.