DevFormatters Blog
Tutorials, guides, and tips for developers.
Base64 in Modern REST APIs: When and How to Use It
Learn when to use Base64 in REST APIs, how to handle large payloads, and why base64url exists. Real debugging stories from production API integrations.
JsonformatterHow to Generate JSON Schema from JSON: Step-by-Step Guide
Turn any JSON sample into a JSON Schema automatically. Covers type inference, required fields, nested objects, and the mistake that cost us an API outage.
String-length-calculatorString Length Calculator: Counting Characters Correctly in JavaScript
How to count characters, bytes, and grapheme clusters in JavaScript. Real code for handling emoji, CJK characters, and the edge case that broke our input validation.
String-length-calculatorString Length in JavaScript vs Python vs Go vs SQL: A Complete Comparison
Why 'hello'.length returns 5 in JavaScript but len('hello') returns 5 in Python — until you throw emoji into the mix. Real Unicode edge cases across 5 languages.
JsonformatterCommon JSON Schema Validation Errors and How to Fix Them
The 10 most common JSON Schema validation errors developers encounter, with real error messages and the exact fixes. Based on analyzing 5,000+ validation failures.
JwtJWT Authentication in Microservices: What I Learned the Hard Way
Real-world JWT authentication patterns for microservices. Token revocation, key management, and the mistake that took down our staging environment for 6 hours.