開發者工具
建置軟體的實用工具。
JavaScript Beautifier
Format and beautify JavaScript code with indentation, readable blocks, and optional minification.
Fake API Directory
Browse free fake REST APIs for testing and prototyping — JSONPlaceholder, ReqRes, FakeStore, and more with live endpoints and copy-ready URLs.
CIDR Calculator
Analyze CIDR blocks, convert prefix lengths to subnet masks, split networks, and check whether an IP belongs to a range.
Regex Tester
Test regular expressions live against sample text with flags, match details, and replace preview.
Timestamp DateTime Converter
Free timestamp converter — Unix epoch, ISO 8601, SQL datetime, and more, both ways. Instant, in your browser.
GraphQL Formatter
Free online GraphQL formatter and pretty printer — format or minify queries, mutations, and fragments in your browser.
Reverse DNS Lookup
Look up PTR reverse DNS records for a public IP address. Resolve hostnames and verify forward DNS (FCrDNS) alignment.
GitHub README Downloader
Download README.md from any public GitHub repository URL — preview Markdown and save the file instantly. Free, no signup.
Port Scanner
Scan common TCP ports on a public host — check which services are reachable from the server.
AES Encrypt
Encrypt and decrypt text with AES-GCM or AES-CBC using a passphrase or hex key, entirely in your browser.
CSS to Tailwind HTML to React
Free CSS to Tailwind converter and HTML to React JSX tool — paste code, preview, and copy utilities or components in your browser.