Technical guides, tutorials, and deep-dives on programming, electronics, and developer tools.
Code examples for generating MD5, SHA-1, SHA-256 and SHA-512 cryptographic hashes in Python, JavaScript, Node.js, PHP, Java and Go. Copy-paste ready snippets for every language.
Copy-paste code examples for generating UUID v4 and UUID v7 in Python, JavaScript, Node.js, PHP, Java and Go. Covers built-in modules, popular libraries, and bulk generation.
Base64 encoding converts binary data into ASCII text so it can be safely transmitted over text-based protocols. Learn how the algorithm works, when to use it, and what its limitations are.
A practical guide to text case conversion in JavaScript. Learn the naming conventions used across programming languages and how to implement robust case-conversion functions.
URL encoding (percent-encoding) ensures special characters are safely transmitted in URLs and query strings. Learn which characters need encoding, how the algorithm works, and the difference between encodeURI and encodeURIComponent.
Learn how word counters and text analysis tools work under the hood. Understand the difference between word, character, sentence, and paragraph counts — and what metrics like reading time are based on.
Learn how to convert between binary, hexadecimal, decimal, and octal number systems. Understand why these number bases exist and how they are used in programming, memory addressing, and hardware.
Bitwise operations manipulate individual bits within integers and are essential in systems programming, embedded development, and performance-critical code. Learn how each operation works with practical examples.
ASCII is the foundation of modern text encoding. Learn how ASCII maps characters to numbers, what control characters do, how extended ASCII grew from 128 to 256 characters, and how Unicode superseded it.
Cryptographic hash functions like SHA-256 and SHA-512 produce a fixed-size fingerprint of any data. Learn how they work, why they are one-way, and how they are used in password storage, data integrity, and digital signatures.
RSA is the most widely used public-key cryptosystem, underpinning HTTPS, SSH, and digital signatures. Learn the mathematics behind RSA key pairs, how encryption and signing work, and practical key sizes to use.
AES (Advanced Encryption Standard) is the world's most widely used symmetric encryption algorithm. Learn how AES-256 works, what CBC mode means, why initialization vectors matter, and how to use AES correctly in your applications.
Strong passwords are the first line of defence against account compromise. Learn what makes a password strong, how to calculate password entropy, and the best practices for generating and managing passwords in 2026.
UUIDs (Universally Unique Identifiers) are 128-bit identifiers designed to be unique without a central coordinator. Learn the difference between UUID versions, when to use each, and the trade-offs compared to sequential IDs.
Unix timestamps are the universal language of time in computing. Learn what a Unix timestamp is, how to convert it to a human-readable date, handle timezones, deal with Year 2038, and use the Temporal API.
CRON expressions define schedules for automated tasks. Learn the five-field syntax, special characters, common patterns, and how to avoid common pitfalls when writing CRON schedules for cron jobs, CI/CD pipelines, and cloud schedulers.
JSON is the universal data interchange format, but poorly formatted or invalid JSON is a common source of bugs. Learn JSON syntax rules, formatting best practices, how to validate JSON, and common pitfalls to avoid.
JSON Web Tokens (JWTs) are widely used for authentication and authorisation. Learn how JWTs are structured, how signing works, the difference between HS256 and RS256, and the critical security rules every developer must follow.
Regular expressions are one of the most powerful tools in a developer's toolkit. Learn regex syntax, quantifiers, groups, lookaheads, and a collection of real-world patterns for validating email, URLs, dates, and more.
Ohm's Law is the fundamental relationship between voltage, current, and resistance in electrical circuits. Learn the formula, understand what each variable means physically, and see worked examples for common electronics calculations.
Connecting an LED directly to a voltage source will destroy it. Learn how to calculate the current-limiting resistor you need, understand forward voltage and current ratings, and handle different supply voltages and LED colours.
A voltage divider is one of the simplest and most useful circuits in electronics. Learn the formula, how to design a divider for any output voltage, understand loading effects, and see practical applications like sensor interfaces and logic level shifting.
Resistor colour codes encode the resistance value directly on the component body. Learn to decode 4-band, 5-band, and 6-band resistors, understand tolerance and temperature coefficient bands, and remember the colour sequence with a mnemonic.
HTML entities encode special characters so they display correctly in browsers and do not break HTML structure. Learn which characters must be escaped, how entity encoding prevents XSS attacks, and how to encode and decode in JavaScript.
RC circuits are fundamental building blocks in electronics, used for timing, filtering, and signal shaping. Learn how capacitors charge and discharge through a resistor, what the time constant is, and how to calculate RC values for your circuits.
CSS specificity determines which style rule applies when multiple rules target the same element. Learn the specificity calculation algorithm, understand the cascade, and avoid common pitfalls like over-using !important.