What is Base64? A Deep Dive for Developers
Every developer has seen those long strings of random-looking characters — something like SGVsbG8gV29ybGQ= — and wondered what on earth they are. That's Base64 encoding, and once you understand it,...
Source: DEV Community
Every developer has seen those long strings of random-looking characters — something like SGVsbG8gV29ybGQ= — and wondered what on earth they are. That's Base64 encoding, and once you understand it, you'll start seeing it everywhere: in JWTs, email attachments, CSS stylesheets, API payloads, and more. Let me break it down properly — not just the "what", but the "how" and "why" too. So what actually is Base64? Base64 is a way to represent binary data as plain text. Computers store everything as binary — images, PDFs, audio files, executables — it's all 1s and 0s underneath. The problem is that many systems (HTTP headers, JSON, email, XML) were designed to handle text only. If you try to shove raw binary data through a text-based system, it gets corrupted. Characters get misinterpreted, null bytes get stripped, line endings get mangled. Base64 solves this by converting binary data into a safe set of 64 printable ASCII characters: A-Z (26 characters) a-z (26 characters) 0-9 (10 characters)
