Encoding Guides
1 articleEncoding is the invisible infrastructure that makes digital communication possible — every character you read, every file you transfer, and every API response you parse depends on correct encoding and decoding. Yet encoding is also one of the most misunderstood areas in development, leading to mojibake (garbled text), data corruption, and security vulnerabilities. These guides demystify the encoding landscape: from the fundamentals of character encoding (ASCII, UTF-8, UTF-16) and binary-to-text schemes (Base64, hex), to cryptographic hashing (SHA-256, bcrypt) and the critical distinction between encoding, encryption, and hashing. You will learn why Base64 is not encryption, how URL encoding prevents injection attacks, and when to use which encoding scheme for data storage, transmission, and security.
What You'll Learn
- Character encoding: ASCII, UTF-8, UTF-16 — history, mechanics, and choosing correctly
- Base64 encoding: use cases, URL-safe variants, padding, and common implementation mistakes
- URL encoding (percent-encoding): RFC 3986 compliance and double-encoding prevention
- Cryptographic hashing: SHA-256, bcrypt, Argon2 — properties, use cases, and security considerations
- The encoding vs encryption vs hashing distinction — and why confusing them causes vulnerabilities
- JWT (JSON Web Token): structure, encoding, signing, and common security pitfalls
Why This Matters
Encoding mistakes are among the most common causes of data corruption and security vulnerabilities. Misusing Base64 as "encryption" has exposed sensitive data in countless applications. Incorrect URL encoding breaks API integrations. Wrong character encoding silently corrupts database content. Understanding encoding fundamentals prevents an entire class of bugs that are difficult to diagnose after the fact.