What Is PascalCase (UpperCamelCase)?
PascalCase is a compound identifier convention where the initial letter of every concatenated word—including the very first word—is capitalized with no delimiter characters.
PascalCase (also known as UpperCamelCase) is a naming convention where every word in an identifier begins with a capital letter, with no intervening spaces, hyphens, or underscores (for example, UserProfileSetting).
What Regex & Tokenization Rule Does PascalCase Use?
The converter splits input on non-alphanumeric separators (/[^\p{L}\p{N}]+/u) and lowercase-to-uppercase transitions (/(?<=\p{Ll})(?=\p{Lu})/u), then runs words.map(w => w[0].toUpperCase() + w.slice(1).toLowerCase()).join("").
- Worked Before / After Example: Input
user profile setting\nauth token manager\napi response handler(9 words, 60 characters, 3 lines) → OutputUserProfileSettingAuthTokenManagerApiResponseHandler(1 concatenated identifier, 52 characters, 8 whitespace separators removed, 9 initial letters capitalized).
| Input Format / Transformation Rule | Input Example (Before) | Output Result (After) | Characters Changed (count) |
|---|---|---|---|
Plain Words → PascalCase |
user profile setting (20 chars, 3 words) |
UserProfileSetting (18 chars, 1 token) |
-2 spaces removed, 3 initials capitalized |
snake_case → PascalCase |
auth_token_manager (18 chars) |
AuthTokenManager (16 chars) |
-2 underscores removed, 3 initials capitalized |
kebab-case → PascalCase |
api-response-handler (20 chars) |
ApiResponseHandler (18 chars) |
-2 hyphens removed, 3 initials capitalized |
camelCase → PascalCase |
userProfileSetting (18 chars) |
UserProfileSetting (18 chars) |
1 leading letter capitalized (0 chars lost) |
Where Is PascalCase Required in Software Engineering?
PascalCase is required for class definitions, interfaces, types, structs, and UI components in TypeScript, React, C#, Python, and Swift.
- C# & .NET: Class names, method names, properties, and namespaces follow PascalCase per Microsoft design guidelines.
- TypeScript & JavaScript: Classes, interfaces, type aliases, and React/Vue component names.
- Python: PEP 8 conventions specify PascalCase (CapWords) for class definitions.
- Swift: Structs, classes, enums, and protocols use UpperCamelCase.
How Does Instant On-Device Transformation Work?
All tokenization runs locally in your browser without sending source code or identifiers to any external server.
Text Cleaner splits text by spaces, underscores, and hyphens, capitalizes the leading character of every segment, and removes separators without losing numbers or alphanumeric characters.
