Blog
Developer guides, tutorials, and tips on security, data formats, and more.
What the BeautiCode Blog covers
The blog is written by the same team that ships the tools — every guide exists because we needed the answer while building or debugging something real. Topics currently focus on the areas below:
- Data formats — JSON vs YAML vs XML vs CSV, when to reach for each, how to convert safely, and what breaks at the edges (Unicode, nested arrays, streaming).
- Encoding — Base64, URL percent-encoding, text encodings (UTF-8/UTF-16), when each one matters, common bugs.
- Cryptography & security — password hashing, HMAC, JWTs, AES-GCM, bcrypt, EIP-55 checksums, and browser-only security utilities.
- Practical tooling — QR code generation, SVG optimization, image privacy, and browser-based workflows that connect directly to visible tools.
- Web3 & blockchain — Ethereum basics, EIP-55 checksum validation, and unit conversion context.
Each guide is long-form, source-backed, and linked to BeautiCode tools that implement the technique so you can experiment immediately. This page highlights 23 focused guides with practical examples and direct tool connections.
Guide tracks
The articles are grouped by the same workflows used in the tool catalog, so a reader can move from explanation to browser-side practice without changing context.
Data format decisions
JSON, CSV, YAML, XML, schema validation, and conversion guides tied to visible formatter and converter tools.
Security review workflows
Password generation, bcrypt, HMAC, JWT, AES, and hash explanations for local security utilities.
Encoding and text handling
Base64, URL percent-encoding, Unicode, UTF-8, and the mistakes that break API payloads.
Web3 and asset tooling
Ethereum addresses, token units, QR codes, SVG optimization, image privacy, and practical browser workflows.
Markdown to HTML: Safe Rendering Guide
Turn Markdown into HTML without shipping broken headings, unsafe links, script injection, or preview styles that disagree with production.
JSON Diff Workflows for API Change Reviews
A practical workflow for comparing JSON payloads, spotting contract-breaking API changes, and deciding when a schema update is safer than a manual review.
URL Encoding and Percent-Encoding Guide
Learn when to encode query strings, path segments, form bodies, and redirect URLs without breaking APIs, OAuth callbacks, or analytics links.
Bcrypt vs Argon2: Password Hashing Guide
Why bcrypt remains common despite Argon2 winning the PHC competition. Cost factor tuning, salting, scrypt and PBKDF2 alternatives, and how to migrate without forcing reset emails.
JSON Schema Validation: Protecting Your API with Data Contracts
TypeScript types vanish at runtime, so your API still trusts whatever shows up in req.body. JSON Schema 2020-12, Ajv, and how to ship contracts that hold under real traffic.
Token Decimals and Human Units: Where DeFi Math Quietly Goes Wrong
USDC has 6 decimals, ETH has 18, SOL has 9. The off-by-one decimal bug that bricks a transaction or misprints a balance is one of the most frequent DeFi failures — here is how to think about it.
HMAC vs Signatures: API and Webhook Security Guide
Stripe webhooks use HMAC, OIDC ID tokens use RSA, JWTs ship in both flavours. The choice is rarely about cryptography — it is about who needs to hold the key and when.
Image EXIF and Privacy: What Your Photos Carry, and How to Strip It
Every photo from a modern phone or camera carries GPS coordinates, a device fingerprint, and a timestamp. Most of the time nobody cares. The cases when it matters are the ones worth knowing about.
YAML Configuration Best Practices for Developers
YAML whitespace is unforgiving and the Norway problem (no:) still bites. Types, anchors, aliases, and the rules that keep Kubernetes manifests, GitHub Actions, and Helm values readable.
CSV Data Processing: Parsing, Converting, and Best Practices
CSV looks trivial until a field contains a comma in quotes inside a newline. Format rules, parser pitfalls, language-by-language code, and a checklist for safe conversions.
Ethereum for Developers: Addresses, Checksums, and Key Concepts
Everything you need to start shipping on Ethereum: EIP-55 address checksums, wei-to-ether math, gas mechanics, wallet derivation, and the Hardhat vs Foundry split.
SQL Formatting Best Practices: Write Clean, Readable Queries
Where to break lines, when to indent JOINs, and how to keep CTEs readable past 30 lines. Style guide comparisons and the rules that hold up across SQL dialects.
AES Encryption Explained: How It Works and Why It Matters
AES-GCM is the default for new code, but you still need to know why CBC is dangerous without authentication. Key sizes, modes, IV reuse pitfalls, and a list of real-world misuses.
Text Encoding Demystified: ASCII, Unicode, and UTF-8 for Developers
Why a string of question marks shows up where Japanese should be, and how UTF-8 survives ASCII parsers anyway. From code points to BOMs to mojibake recovery.
HTTP Status Codes: A Complete Reference Guide for Developers
Knowing these codes cold pays off in API design reviews. 1xx through 5xx with practical examples, the 301 vs 302 vs 307 trade-off, and the codes most teams under-use.
Regular Expressions for Beginners: A Practical Guide with Examples
Regex looks like noise until you read it left to right with the right mental model. Character classes, quantifiers, lookaheads, and the ten patterns that cover most real work.
QR Codes: A Complete Guide for Developers and Businesses
QR codes are a grid of black and white modules with built-in error correction. Types, sizing trade-offs, design rules that survive scanners, and what payment and Wi-Fi codes look like underneath.
SVG Optimization for Web Performance: Tips and Techniques
SVGs are XML, so they compress well — but the default export from Figma is bloated. Manual cleanups, SVGO, inline vs external trade-offs, and the accessibility attributes worth keeping.
Base64 Encoding Explained: What It Is and When to Use It
Base64 is not encryption — it is the way to push 8-bit bytes through 7-bit ASCII channels. Where it shows up (data URIs, JWT segments, basic auth) and how to spot a botched decode.
JWT Tokens Explained: A Developer's Guide to JSON Web Tokens
Authenticating an API call without hitting the session store needs a token the server can validate locally. JWT structure, signing algorithms, and the foot-guns nobody warns you about.
JSON vs YAML: When to Use What — A Developer's Guide
JSON wins on APIs; YAML wins on configs. Side-by-side syntax, parser behaviour, and where each fits across Kubernetes manifests, REST payloads, and GitHub Actions.
Understanding Hash Functions: MD5 vs SHA-256 Explained
MD5 is fine for download integrity checks but a security disaster for passwords. How SHA-256 fixes the gap, where collisions matter, and what bcrypt is actually doing on top.
Secure Passwords: Practical Developer Guide
What entropy, length, uniqueness, and randomness actually buy you, plus the password manager habits that prevent one breach from becoming many.