Quick Reference for
Every Code You Need
HTTP status codes, HTML entities, JavaScript keycodes, ASCII codes, and more—all in one fast, searchable place.
Reference Categories
Choose a category to explore comprehensive code references
JavaScript KeyCodes
Complete reference for keyboard event codes, including event.keyCode, event.key, and event.code with interactive tester
HTTP Status Codes
Quick reference for HTTP response status codes from 100-599, with descriptions and use cases
HTML Entities
Special characters and symbols for HTML with entity names and codes
ASCII Codes
Complete ASCII table with decimal and hexadecimal values
Color Codes
HEX, RGB, and HSL color codes for web development and design
Country Codes
ISO 3166 country codes with alpha-2, alpha-3, and numeric formats
MIME Types
Media types for HTTP Content-Type headers and file formats
Language Codes
ISO 639 language codes for internationalization and localization
Currency Codes
ISO 4217 currency codes with symbols and country information
Port Numbers
Common TCP/UDP port numbers for web, database, and network services
Exit Codes
Shell, Bash, and application exit status codes explained
Most Popular Codes
Frequently searched and commonly used codes across all categories
Enter Key
Form submission and confirmations
200 OK
Successful HTTP request
United States
ISO country code for USA
404 Not Found
Resource could not be found
HTTPS
Secure web traffic port
Success
Successful command execution
English
ISO 639 language code
US Dollar
American currency code
JSON
JSON data media type