Case Format Reference

Format	Example	Common Use
UPPER CASE	HELLO WORLD	Acronyms, emphasis, constants
lower case	hello world	General writing, URLs
Title Case	Hello World	Headings, book titles, proper nouns
Sentence case	Hello world.	Normal sentences, paragraphs
camelCase	helloWorld	JavaScript variables & functions
PascalCase	HelloWorld	Class names (JS, C#, Java)
snake_case	hello_world	Python variables, file names, SQL
kebab-case	hello-world	CSS classes, HTML attributes, URLs
SCREAMING_SNAKE	HELLO_WORLD	Constants in most languages
dot.case	hello.world	Config keys, package names
aLtErNaTiNg	hElLo WoRlD	Memes, sarcasm

What Is Text Case?

Text case refers to the capitalization pattern used for letters in a word or phrase. Different programming languages, writing styles, and platforms have strong conventions around which case to use — and mixing them up causes bugs, style guide violations, or simply looks unprofessional.

Which Case Should I Use in Code?

JavaScript: camelCase for variables and functions; PascalCase for classes; SCREAMING_SNAKE_CASE for constants.

Python: snake_case for variables, functions, and file names; PascalCase for classes; UPPER_SNAKE_CASE for constants.

CSS: kebab-case for class names and custom properties.

SQL: snake_case for column and table names (conventional, though not enforced).

URLs and file names: kebab-case is SEO-friendly and universally supported.