開発者ツール
プログラマー向けの開発・デバッグツール
下のツールを選ぶだけで利用できます。すべて無料でブラウザ内で動作します。
💻 開発者ツール · 計 42 個のツール
AES 暗号化/復号ツールAES encrypt decrypt tool: support AES encryption and decryption with key and IV for development and security, with one-click copy, offline and multilingual.
シーザー暗号ツールCaesar cipher tool: encrypt and decrypt with any shift 1-25, letters only with case preserved for learning, one-click copy and offline.
Code128 バーコード生成Code128 barcode generator: support ASCII charset with automatic checksum generating standard barcode SVG for products and logistics, with one-click copy and offline.
Cookie フォーマッターCookie formatter: parses Cookie strings to JSON/table with URL decoding and rebuilds Cookies from JSON. For debugging. Supports batch processing and one-click copy.
CRC32 / Adler-32 チェックサムChecksum calculator: support CRC32 and Adler-32 algorithms outputting hex and decimal results for file and data verification, with one-click copy and offline.
Cron 式パーサーCron parser: parse 5-field cron expressions into readable descriptions and next run times for scheduling, with one-click copy and offline.
CSS 整形・圧縮ツールCSS formatter and minifier: beautify or minify CSS with one click, removing comments while keeping syntax valid for frontend, with one-click copy and offline.
CSV → Markdown テーブルCSV to Markdown: converts CSV to Markdown tables with comma/semicolon/Tab and quote handling. Supports batch processing, export and one-click copy, offline use.
ダウンロード時間計算機Download time estimator: calculate download time from file size and connection speed for downloads, with one-click copy and offline.
.env ファイル整形.env formatter: parse KEY=VALUE and align, trim and escape or convert to JSON for config and deployment, with one-click copy and offline.
.gitignore 生成Gitignore generator: select Node, Python, Java, Go, Vue etc to generate .gitignore with custom merge. Supports batch processing, export and one-click copy.
Gzip 圧縮/解凍ツールGzip compress tool: compress text to Base64-encoded Gzip or decompress back for transfer and storage, with one-click copy and offline.
HMAC-SHA256 計算機HMAC generator: enter message and secret to generate HMAC-SHA256 hex and Base64 signatures. For API signing. Supports batch processing, export and one-click copy.
HTML エンコード/デコードとJS変換HTML escape and decode tool: support special character escape, entity decode and deep numeric encoding for web and security, with one-click copy and offline.
HTML テーブル生成HTML table generator: paste CSV data to generate HTML table code with header, border and class settings and preview for development, with one-click copy and offline.
HTML → Markdown 変換HTML to Markdown converter: convert HTML to Markdown with headings and links for docs and writing, with one-click copy and offline.
HTTP ステータスコード検索HTTP status codes reference: look up 1xx-5xx meanings, scenarios and troubleshooting with all common codes for development and ops, with one-click copy and offline.
面接質問ジェネレーターInterview questions: pick a category (frontend, backend, algorithm, system design, behavioral) and count (1-10) for random open-ended questions with one-click copy.
IP サブネット計算機IP subnet calculator: calculate network address and broadcast from IPv4 and prefix for networking, with one-click copy and offline.
IPv6 アドレスの展開・圧縮IPv6 expander: expand compressed addresses to full 8 groups or compress back with validation for networking and ops, with one-click copy and offline.
JavaScript 整形・圧縮JavaScript formatter: beautify indentation, minify size and safely handle strings and comments with custom indent for development, with one-click copy and offline.
JSON フラット化JSON flattener: expand nested JSON into dot-path key-value pairs with array indexes and custom separators for config and APIs, with one-click copy and offline.
JSON → CSV 変換JSON to CSV converter: convert JSON array to CSV with custom delimiters and header export for data processing, one-click copy, offline and multilingual.
JSON → TypeScript 変換JSON to TypeScript: converts JSON to TypeScript interfaces with nested support. For frontend. Supports batch processing, export and one-click copy, offline use.
JSON → YAML 変換JSON to YAML converter: convert JSON objects to YAML format with nesting and arrays for config and development, with one-click copy and offline.
JSON ツリービューアJSON tree viewer: render JSON as collapsible color-coded tree with expand and collapse for deep data for APIs, with one-click copy and offline.
JWT エンコーダー (HS256)JWT encoder: inputs header, payload and secret to generate HS256 JWT token. Supports batch processing, export and one-click copy, offline use.
MAC アドレス生成機MAC address generator: generate random MAC addresses in bulk with multiple formats for networking, with one-click copy and offline.
Markdown テーブル生成機Markdown table generator: visually edit rows and columns to generate table code with header and alignment for docs and README, with one-click copy and offline.
Markdown → HTML 変換Markdown to HTML converter: support headings, bold, italic, links, lists and code blocks with live preview for writing and docs, with one-click copy and offline.
Markdown 目次生成Markdown TOC generator: extract headings to generate anchored table of contents with nesting for docs, with one-click copy and offline.
MD5 ハッシュ計算機MD5 hash tool: compute 32-char hex MD5 digest for UTF-8 text locally for privacy for verification and learning, with one-click copy and offline.
MIME タイプ検索MIME lookup: enter file extension or MIME to get Content-Type with common types. Supports batch processing, export and one-click copy, offline use.
ランダム IP・ポート生成Random IP and port generator: generate random public IPv4 with port and validate IP:port format for network testing, with one-click copy and offline.
SQL 整形ツールSQL formatter: beautify SQL with keyword uppercasing and indentation for multiple dialects and debugging, one-click copy and offline.
文字列エスケープ/アンエスケープ（JS）String escape tool: convert strings to JavaScript escaped form handling quotes and newlines for coding, with one-click copy and offline.
Unicode エンコード/デコード（\u）Unicode converter: convert Chinese, Emoji and text to \uXXXX escapes or restore with bulk and large text for development, with one-click copy and offline.
User-Agent パーサーUser-Agent parser: paste UA string to identify browser, version, OS and device with highlighting for development and analytics, with one-click copy and offline.
UTF-16 エンコード/デコード（\x）UTF-16 converter: convert text to \xXXXX hex escapes or decode back supporting bulk and large text for development and debugging, with one-click copy and offline.
XML → JSON 変換XML to JSON converter: convert XML to JSON handling attributes and nesting with validation for development, with one-click copy and offline.
YAML 整形YAML formatter: parse and reformat YAML with clean indentation and quoting for clear output for config and learning, with one-click copy and offline.
YAML から JSON への変換YAML to JSON converter: support indent-nested maps and scalars converting to formatted JSON for config, with one-click copy and offline.
よくある質問
「開発者ツール」カテゴリとは？
「開発者ツール」カテゴリには 42 個の無料ツールがあります。すべてブラウザ内で動作します。
これらのツールは無料ですか？
はい、すべて無料で回数制限もありません。
登録は必要ですか？
不要です。ページを開くだけで使えます。データはアップロードされません。
対応言語は？
This site supports 12 languages: Chinese, English, Japanese, Spanish, French, Portuguese, Arabic, Indonesian, Hindi, Thai, Vietnamese and Bengali.