camelCase vs snake_case: A Developer's Guide to Naming Conventions
4 min read
Naming conventions matter more than most developers realize. Consistent casing makes code readable, searchable, and professional. Here's when to use each style.
The Main Conventions
- camelCase - first word lowercase, subsequent words capitalized:
getUserName - PascalCase - every word capitalized:
UserProfile - snake_case - all lowercase, words separated by underscores:
get_user_name - kebab-case - all lowercase, words separated by hyphens:
user-profile - SCREAMING_SNAKE - all uppercase with underscores:
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Which Languages Use Which?
| Convention | Languages / Contexts |
|---|---|
| camelCase | JavaScript, Java, TypeScript (variables, functions) |
| PascalCase | C#, React components, TypeScript (types, classes) |
| snake_case | Python, Ruby, Rust, SQL, PHP |
| kebab-case | CSS classes, HTML attributes, URLs, CLI flags |
| SCREAMING_SNAKE | Constants in most languages, environment variables |
Why Consistency Matters
Mixing conventions in the same codebase creates cognitive friction. When you see user_name in one file and userName in another, you waste mental energy translating between them. Pick one convention per context and stick with it.
Converting Between Conventions
Use the Case Converter to instantly convert text between all major conventions. Paste a variable name and see it in camelCase, snake_case, PascalCase, kebab-case, and more - all at once. One-click copy for each format.
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