ハンドブック
学んでから実践する
主要な開発トピックのための構造化ハンドブックです。まず内容を理解し、準備ができたら関連ツールで試せます。
DA
Data Tools 日本語カテゴリ
日本語の data ツールカテゴリ: Format, validate, and transform structured data.
Data Tools 日本語カテゴリ
JSON Course 日本語ガイド
日本語の json ガイド: A structured introduction to JSON: syntax, types, parsing, generation, real-world patterns, and ecosystem tradeoffs.
Data Tools 日本語カテゴリ
Unix Time & Timestamps Course 日本語ガイド
日本語の timestamp ガイド: Learn Unix epoch time, seconds vs milliseconds, UTC, timezones, ISO 8601, and how to debug timestamps in logs and APIs.
Data Tools 日本語カテゴリ
YAML Course 日本語ガイド
日本語の yaml ガイド: Learn YAML for configs and DevOps: syntax, JSON differences, Kubernetes and CI workflows, and debugging.
Data Tools 日本語カテゴリ
XML Course 日本語ガイド
日本語の xml ガイド: Learn XML for configs and markup: syntax, namespaces, Maven/Android files, formatting vs validation, and debugging.
Data Tools 日本語カテゴリ
SQL Course 日本語ガイド
日本語の sql ガイド: Learn practical SQL for application debugging: query structure, filtering, joins, aggregation, formatting, and common mistakes.
Data Tools 日本語カテゴリ
CSV and Tabular Data Course 日本語ガイド
日本語の csv ガイド: Learn practical CSV and tabular data workflows: headers, delimiters, quoting, JSON conversion, flattening, and debugging.
Data Tools 日本語カテゴリ
Text Diff and Comparison Course 日本語ガイド
日本語の text diff ガイド: Learn practical text comparison workflows: line and word diff, side-by-side and unified views, config and log review, and when to use text diff vs JSON diff.
Data Tools 日本語カテゴリ
JSON Schema Course 日本語ガイド
日本語の json schema ガイド: Learn how JSON Schema describes data contracts, validates payloads, and evolves with APIs and configuration files.
EN
Encoding Tools 日本語カテゴリ
日本語の encoding ツールカテゴリ: Encode and decode common developer formats.
Encoding Tools 日本語カテゴリ
Base64 Course 日本語ガイド
日本語の base64 ガイド: Learn Base64 encoding from first principles: binary-to-text, padding, URLs, and common pitfalls.
Encoding Tools 日本語カテゴリ
URL Encoding Course 日本語ガイド
日本語の url encoding ガイド: Understand percent-encoding, query strings, and the difference between encodeURI and encodeURIComponent.
Encoding Tools 日本語カテゴリ
URL Parser Course 日本語ガイド
日本語の url parser ガイド: Learn how URLs are structured, parsed, normalized, and debugged across browsers, APIs, OAuth flows, and logs.
GE
Generator Tools 日本語カテゴリ
日本語の generator ツールカテゴリ: Generate IDs, passwords, and useful development values.
Generator Tools 日本語カテゴリ
UUID Course 日本語ガイド
日本語の uuid ガイド: Learn how UUIDs work, when to use v4, how formats differ, and what version and variant mean.
Generator Tools 日本語カテゴリ
Password Security Course 日本語ガイド
日本語の password ガイド: Learn practical password length, randomness, passphrases, storage, and sharing habits.
Generator Tools 日本語カテゴリ
QR Code Course 日本語ガイド
日本語の qr code ガイド: Learn how QR codes work: error correction, URL and Wi-Fi payloads, PNG output, and a pre-publish testing workflow.
WE
Web Tools 日本語カテゴリ
日本語の web ツールカテゴリ: Inspect and prepare web content quickly.
Web Tools 日本語カテゴリ
HTML Entity Course 日本語ガイド
日本語の html entity ガイド: Learn HTML entities from first principles: escaping, named vs numeric forms, CMS workflows, and debugging.
Web Tools 日本語カテゴリ
Regular Expressions Course 日本語ガイド
日本語の regex ガイド: Learn regular expressions from first principles: literals, metacharacters, flags, capture groups, replacement, and a practical debugging workflow.
Web Tools 日本語カテゴリ
Color for Developers Course 日本語ガイド
日本語の color ガイド: Learn color models for UI work: HEX, RGB, HSL, WCAG contrast, CSS formats, and a practical picking workflow.
Web Tools 日本語カテゴリ
Cron Expressions Course 日本語ガイド
日本語の cron ガイド: Learn Unix cron syntax: five fields, ranges and steps, timezone traps, platform differences, common job patterns, and a practical debugging workflow.
Web Tools 日本語カテゴリ
Markdown Writing Course 日本語ガイド
日本語の markdown ガイド: Learn practical Markdown for developers: syntax basics, GitHub Flavored Markdown, README and issue templates, preview vs HTML export, and a reliable writing workflow.
Web Tools 日本語カテゴリ
CSS Units and Responsive Sizing Course 日本語ガイド
日本語の css units ガイド: Learn practical CSS unit workflows: px, rem, em, %, vw, vh, root font-size context, clamp() fluid sizing, and debugging responsive layouts.
Web Tools 日本語カテゴリ
cURL Converter Course 日本語ガイド
日本語の curl converter ガイド: Understand cURL commands, HTTP request parts, and the limits of converting terminal examples into fetch or Axios code.
SE
Security Tools 日本語カテゴリ
日本語の security ツールカテゴリ: Inspect tokens, hashes, and security-related formats.
Security Tools 日本語カテゴリ
JWT Course 日本語ガイド
日本語の jwt ガイド: Learn JSON Web Tokens from structure to claims, verification boundaries, and practical debugging.
Security Tools 日本語カテゴリ
Hash Course 日本語ガイド
日本語の hash ガイド: Learn cryptographic hashes from first principles: digests, algorithms, integrity checks, and common mistakes.
AI
AI スキル
開発者のワークフロー、プロンプト、コーディング支援、信頼できる AI 活用を学ぶ実践的な AI スキル集です。