Text Case Formats Every Developer Should Know

Choosing the right text case format is more than a style preference. It is a convention that helps teams write consistent, readable, and maintainable code. Here is a complete guide to the most common case formats and where to use them.

camelCase

The first word is lowercase; each subsequent word starts with a capital letter. No spaces or separators.

const userProfile = getUserProfile();

Best for: JavaScript variables, function names, object properties, JSON keys.

PascalCase

Every word starts with a capital letter. No spaces or separators.

class UserProfile {}

Best for: Class names, React components, TypeScript interfaces, enum names.

snake_case

All lowercase with underscores separating words.

user_profile = get_user_profile()

Best for: Python variables, database columns, file names, API endpoints.

kebab-case

All lowercase with hyphens separating words.

<div class="user-profile-card"></div>

Best for: CSS class names, HTML attributes, URL slugs, file names.

CONSTANT_CASE (SCREAMING_SNAKE_CASE)

All uppercase with underscores separating words.

const API_BASE_URL = "https://api.example.com";

Best for: Environment variables, global constants, configuration keys.

Quick Reference Table

Format	Example	Common Use
camelCase	userProfile	JS variables, functions
PascalCase	UserProfile	Classes, components
snake_case	user_profile	Python, databases
kebab-case	user-profile	CSS, URLs
CONSTANT_CASE	USER_PROFILE	Constants, env vars

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