DevDecoder

When to use each format?

Base64 Base64 represents binary data using 64 printable ASCII characters (A–Z, a–z, 0–9, +, /, with = padding). Use it when you need to embed binary data in a text-only context: images in data URIs, file uploads in JSON payloads, credentials in HTTP Basic auth, or attachments in email MIME bodies. Base64 inflates size by about 33%.

What is a JSON Web Token?

A JWT is a compact, URL-safe way to represent claims — small pieces of information — transferred between two parties. It's most often used as a bearer token: the client presents it with each request, and the server trusts it because it was signed by an authority the server recognizes.

Case conversion — which case where?

camelCase — JavaScript/TypeScript variables and functions; JSON keys in JavaScript-first APIs. PascalCase — class names, type names, React components, C# everything.

When to use a diff?

Comparing API responses. Capture one response, change a parameter, capture the other — the diff tells you exactly which fields changed. Reviewing config changes. Before and after an environment migration, paste the two config files and see which values moved. Verifying redactions. Produce a version of a document with sensitive data removed, diff against the original, confirm nothing else changed.

Error correction: L, M, Q, or H?

QR codes include Reed–Solomon error correction so they still scan when part of the code is obscured, printed imperfectly, or faded. The cost is size: a higher correction level means more modules, so the same content produces a denser code. LevelRecovers fromPick it when L~7% damageDisplayed on a clean screen; no risk of damage. M~15% damageGeneral use. A good default for most cases.