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Deep technical articles on APIs, security, debugging, and developer tooling.
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Why 0 0 1 * 1 Runs 63 Times a Year: The Cron OR Trap
Negative Numbers, Overflow, and What Hex Reveals About Your Data
Most developers can convert hex to decimal — but two's complement, signed overflow, and bit-width boundaries are where base conversion becomes genuinely useful for debugging real problems.
Hash Generator — MD5, SHA-256, SHA-512 & SHA-3 for Data Integrity
Learn how cryptographic hash functions work, when to use MD5 vs SHA-256 vs SHA-3, the avalanche effect, why hashes can't be used for passwords, and how to use a free hash generator for integrity verification.
JWT Decoder — Debug Authentication Errors by Inspecting Token Claims
Learn how to use a JWT decoder to debug 401 errors, understand the header, payload, and signature sections, check expiry and audience claims, and identify security issues like alg:none attacks.
HTML Entities — Encode & Decode Special Characters for Correct, Safe HTML
Learn what HTML entities are, why they exist, the most common named entities, how numeric entities work for any Unicode character, and when modern UTF-8 pages don't need them — with a free HTML entities tool.
Number Base Converter — Binary, Octal, Decimal & Hex Explained
Learn how binary, octal, decimal, and hexadecimal number systems work, when each is used in programming, and how to convert between them instantly with a free number base converter.
JWT Decoder — Inspect Any JSON Web Token Instantly
Learn what's inside a JSON Web Token, how to read the header, payload, and expiration claims, and how to use a free JWT decoder to debug authentication issues instantly.
Base64 Encoder/Decoder — How It Works & Real Developer Uses
Learn what Base64 encoding is, how it works, why it's used in JWTs, HTTP headers, data URIs, and email attachments — and how to encode or decode any string instantly with a free tool.
UUID Generator — Generate Unique Identifiers for Any Application
Learn what UUIDs are, the differences between versions 1, 4, and 7, when to use UUIDs over auto-increment integers, and how to generate them instantly with a free UUID generator.
Regex Tester — Write & Debug Regular Expressions with Live Highlighting
Learn how to write and debug regular expressions using a live tester — with syntax reference, real examples for email validation, log parsing, and URL extraction, and tips on greedy vs. lazy matching.
JSON Unescape & Cleaner — Fix Escaped and Double-Encoded JSON Instantly
Learn what causes JSON to become escaped or double-encoded, how to recognise it, and how to use a free JSON unescape tool to clean up messy JSON from logs, APIs, and databases instantly.
Bcrypt Generator — How to Hash & Verify Passwords Correctly
Learn what bcrypt is, how the cost factor and salt work, how bcrypt hashes are structured, and how to use a free bcrypt generator to test and verify password hashes in your development workflow.
Colour Converter — HEX, RGB, HSL, HSV & CMYK Explained
Learn the difference between HEX, RGB, HSL, HSV, and CMYK colour formats, when each is used, and how to convert between them instantly with a free colour converter for web and design work.
