justyourdevDeveloper Reference
Cheat sheets and lookup tables for the things you look up every week.
- HTTP status codesEvery HTTP status code and what it means
- MIME typesCommon MIME types by file extension
- ASCII tableAll 128 ASCII codes in dec, hex, octal and binary
- HTML entitiesNamed HTML entities with their codes
- Regex cheat sheetRegular expression syntax at a glance
- Cron examples30 common cron schedules explained
- Chmod examplesCommon Unix permissions like 644 and 755
- Unix timestamp referenceNotable epochs, the 2038 problem and code
- Git cheat sheetEveryday Git commands in one place
- Markdown cheat sheetMarkdown and GitHub Flavored syntax
About these references
Each page is a single, fast table you can scan or filter: status codes with their meaning and the RFC that defines them, media types by file extension, all 128 ASCII codes, HTML entities, and cheat sheets for regular expressions, cron, file permissions, Unix time, Git and Markdown. Content follows the primary sources (RFC 9110 and the IANA registries for HTTP and media types, the WHATWG list for HTML entities) and links to the tool that does the job.
Looking for a tool rather than a table? The developer tools format, convert, encode, generate and test, all in your browser.