DevRef

Developer Reference & Tools

Error codes, config files, cheatsheets, and browser-based tools. Quick answers when you're stuck.

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Error Codes (40)

HTTP, Docker, Linux, MySQL, PostgreSQL, Python, Node.js, AWS, and Git error references

Config Files (25)

Copy-paste ready configs for nginx, Docker, GitHub Actions, ESLint, Terraform, and more

Cheatsheets (20)

Quick reference cards for Git, Bash, SQL, Regex, CSS, JavaScript, TypeScript, and more

Interactive Tools (29)

JSON formatter, Base64 encoder, regex tester, hash generator, and 25+ browser-based tools

Keyboard Shortcuts (7)

Essential shortcuts for VS Code, Vim, Chrome DevTools, IntelliJ, and more

X vs Y Comparisons (11)

Side-by-side comparisons: PostgreSQL vs MySQL, REST vs GraphQL, Vite vs Webpack, and more

Popular Tools

JSON Formatter Formatter Base64 Encode/Decode Encoder JWT Decoder Decoder Regex Tester Tester UUID Generator Generator Unix Timestamp Converter Hash Generator Generator URL Encode/Decode Encoder

Popular Error References

HTTP 404 Not Found HTTP 500 Internal Server Error HTTP 403 Forbidden HTTP 502 Bad Gateway Docker Exit 137 ECONNREFUSED Python ModuleNotFoundError Git merge conflict