Camel Case Converter – Convert Text to camelCase for Code

What Is camelCase?

camelCase is a naming convention in which every word in a compound name is joined without spaces, and every word after the first begins with a capital letter. The name comes from the bumps those capitals create in the middle of a word — numberOfItems has humps like a camel's back. The convention exists to solve a specific problem: most programming languages forbid spaces in identifiers, but "number of items" is far easier to read than "numberofitems". Capitalising the internal word boundaries restores the readability that removing the spaces destroyed. Strictly speaking, camelCase is one of two camel conventions. lowerCamelCase leaves the first word in lowercase (userAccount) and is what most people mean by "camelCase". UpperCamelCase capitalises the first word too (UserAccount) and is almost always called PascalCase instead. This converter produces standard lowerCamelCase.

Where camelCase Is the Standard

• •JavaScript and TypeScript: Variables, functions, methods, and object properties all use camelCase. The language's own standard library sets the pattern — toLowerCase, addEventListener, querySelectorAll, JSON.parse. Following it means your code looks like the platform it runs on.
• •JSON APIs: Because JSON grew out of JavaScript, camelCase keys such as firstName, createdAt, and isActive are the most common convention in web APIs — though snake_case remains widespread in APIs whose backends are Python or Ruby.
• •Java: The official Java code conventions mandate camelCase for variables and methods, and PascalCase for classes. getUserName, calculateTotal, and isEmpty are all canonical Java style.
• •Swift and Kotlin: Both modern mobile ecosystems standardised on camelCase for properties and functions, replacing the older Objective-C and Java-with-Hungarian-notation habits that preceded them.
• •C#: Uses camelCase for local variables, method parameters, and private fields, while reserving PascalCase for public members, methods, and types — one of the clearest splits between the two conventions in any language.
• •React and CSS-in-JS: JSX attributes and inline style objects use camelCase because they are JavaScript objects, not CSS. This is why React wants backgroundColor, fontSize, and marginTop where a stylesheet would want background-color, font-size, and margin-top.

Converting Between snake_case and camelCase

The most frequent real-world reason to reach for a camelCase converter is crossing a language boundary. Python, Ruby, PostgreSQL, and MySQL all favour snake_case, while JavaScript favours camelCase. A single feature that touches a database, a Python API, and a React frontend will therefore need the same concept spelled two different ways. A typical Django or Rails endpoint returns keys such as first_name, date_of_birth, and is_verified. The JavaScript consuming that response wants firstName, dateOfBirth, and isVerified. Many teams place a conversion layer at the API boundary so that each side of the stack stays idiomatic, rather than forcing one language to adopt the other's conventions. Pasting a block of database column names into this converter — one per line — gives you the matching JavaScript field names in a single step, which is considerably faster than renaming each one by hand while writing a type definition or an ORM model.

Common camelCase Mistakes

• •Shouting acronyms: parseHTTPResponse and getUserID are hard to read because the eye cannot find the word boundary inside a run of capitals. Treating acronyms as ordinary words — parseHttpResponse, getUserId — is the dominant modern convention and is what Google's and Microsoft's style guides both recommend.
• •Capitalising the first letter: UserName is PascalCase, not camelCase. In languages such as Go the distinction is not stylistic at all — a capitalised first letter makes an identifier exported and publicly visible, so getting it wrong changes what your code actually does.
• •Leaving separators behind: user_firstName mixes two conventions in one identifier and usually signals a half-finished rename. Pick one convention per identifier and apply it consistently.
• •Over-abbreviating: usrAccBal saves nine characters and costs every future reader a moment of decoding. userAccountBalance is longer but needs no explanation, and editor autocomplete means you rarely type the full name anyway.
• •Starting with a digit: 2ndAttempt is not a valid identifier in most languages. Rewrite as secondAttempt or attempt2 instead.

How to Use This camelCase Converter

• •Paste your words, phrase, or existing identifier into the input box — spaces, underscores, hyphens, and mixed capitals are all handled.
• •Click the camelCase button, or press the keyboard shortcut, to convert instantly.
• •Paste one identifier per line to convert an entire batch of column names or JSON keys at once.
• •Click Copy to put the result on your clipboard, or Download to save the whole batch as a text file.
• •Everything runs in your browser — no identifier, schema, or snippet you paste is ever sent to a server.

Frequently Asked Questions