Skip to main content

開発者ツール

ソフトウェア開発向けユーティリティ。

The everyday utilities developers reach for, all free and in one place. Format and validate JSON, convert between JSON, CSV, XML, and YAML, encode and decode Base64 and URLs, decode JWTs, generate UUIDs and hashes, and test regular expressions. There is also a full suite of network and security tools: DNS, SSL, ping, traceroute, and header checks. Client-side tools keep your data on your device, and network tools send only the minimum needed.

Popular 開発者ツール

開発者ツール
CSV to Excel
Convert CSV data into a downloadable Excel workbook (XLSX, XLS, ODS) in your browser, with delimiter detection and number parsing.
Open Tool
開発者ツール
MX Record Lookup
Look up mail exchange (MX) DNS records for a domain, sorted by priority with mail host IP resolution.
Open Tool
開発者ツール
Password Strength Checker
Analyze password strength with entropy estimates, crack-time projections, and improvement tips.
Open Tool
開発者ツール
JSON to YAML
Convert JSON into clean, readable YAML with adjustable indentation — entirely in your browser.
Open Tool
開発者ツール
Traceroute Tool
Trace the network path to a hostname or IP. Shows each hop, round-trip times, and whether the route completed.
Open Tool
開発者ツール
Base64 Encoder
Encode UTF-8 text to Base64 instantly in your browser with byte-size stats.
Open Tool
開発者ツール
Flexbox Generator
Configure CSS flexbox layout with a live preview and copy-ready CSS, inline styles, and Tailwind classes.
Open Tool
開発者ツール
DNS Propagation Checker
Check DNS record propagation across global public resolvers. Compare answers from Google, Cloudflare, Quad9, and more.
Open Tool
開発者ツール
Linux & Windows Command Reference
Search Linux, Windows CMD, PowerShell, Conda, and GitHub CLI (gh) commands with syntax, examples, and shell filters.
Open Tool
開発者ツール
YAML to JSON
Convert YAML into clean JSON with type parsing and adjustable indentation — entirely in your browser.
Open Tool
開発者ツール
Graph Node Builder
Free graph node builder with React Flow — create flowcharts and node diagrams, connect edges, export JSON or PNG. Runs in your browser.
Open Tool
開発者ツール
JSON Formatter
Format, minify, and validate JSON with precise error locations.
Open Tool