Java Decompiler Online vs Desktop Tools: An Honest Comparison
Compare online browser-based Java decompilers with desktop tools like JD-GUI, CFR, Procyon, Fernflower and Krakatau, and learn when each approach wins.
Read more →Dev Tools
Detecting Config Drift Between Environments with JSON Diff
Use JSON diff to detect config drift between staging and production. Normalize, exclude noise, and catch drift before deploys break with semantic comparison.
Read more →
URL-Safe Base64 vs Standard Base64: Key Differences
Standard Base64 uses +, / and = that break URLs, JWTs and filenames. Learn the url safe base64 vs standard base64 difference and how to fix decode errors.
Read more →
Catastrophic Backtracking: Spot and Fix ReDoS-Prone Regex
Learn why nested quantifiers cause catastrophic backtracking, how ReDoS attacks freeze servers, and concrete techniques to detect and rewrite vulnerable regex.
Read more →
Regex Lookahead and Lookbehind: Practical Examples
Master regex lookahead and lookbehind with clear, testable examples — password rules, thousands separators, masking, and the gotchas that trip people up.
Read more →
JWT 'exp' Claim: Fixing Token Expired Errors
Fix JWT token expired errors caused by the exp claim — clock skew, timezone bugs, refresh failures, and leeway — with a fast browser-based decoder workflow.
Read more →
JWT Decode vs Verify: Decoding Doesn't Validate a Token
Decoding a JWT only reads its claims; verifying checks the signature. Learn the difference, why it causes auth bugs, and how to test both safely.
Read more →
JWT Tokens Explained: How They Work and How to Debug Them
Understand JSON Web Tokens: structure, claims, signing vs encryption, expiry, and signature verification — plus the security mistakes that cause auth bugs.
Read more →
JSON Pointer (RFC 6901) Explained
Master JSON Pointer (RFC 6901): how paths address values, why ~0 and ~1 escape ~ and /, the - array token, and how it powers JSON Patch and JSON Schema.
Read more →
How to Apply a JSON Patch in JavaScript, Python, and Go
Apply RFC 6902 JSON Patch in JavaScript, Python, and Go with copy-paste examples. Handle test operations, atomic failure, and validate paths safely.
Read more →
Regex Syntax: A Complete Guide to JavaScript Regex
Learn JavaScript regex from the ground up: character classes, quantifiers, groups, flags, lookaround, and the pitfalls that cause bugs. With testable examples.
Read more →
Decompiling Java JAR Files: A Step-by-Step Guide
Learn how to inspect and decompile Java JAR files step by step, from extracting classes to comparing decompilers and reading bytecode when needed.
Read more →