camelCase Converter

In short camelCase joins words with no separator and capitalises every word after the first, so "user first name" becomes userFirstName. It is the standard naming convention for variables and functions in JavaScript, Java, C# methods and JSON keys, and it exists because most languages will not allow a space in an identifier. The conversion strips spaces, hyphens and underscores and uses them as word boundaries, which means it round-trips cleanly from snake_case or kebab-case: user_first_name and user-first-name both give userFirstName. Going the other way is where information is lost — camelCase to snake_case has to guess word boundaries from the capitals, and it gets acronyms wrong. "parseHTMLDocument" has no unambiguous snake_case form, which is why style guides for languages that use camelCase usually recommend treating an acronym as a single word: parseHtmlDocument. The distinction from PascalCase is only the first letter, and the convention in most codebases is camelCase for variables and PascalCase for types and classes.