Camel Case Converter — Free Online Tool
What is Camel Case Converter?
Camel Case (camelCase) is a naming convention that joins multiple words into a single string by removing spaces and capitalising the first letter of each word except the very first one. The result looks like thisIsAnExample — the uppercase letters in the middle resemble the humps of a camel.
It is the dominant naming convention for variables and functions in JavaScript, JSON keys, Java methods, and many REST API response fields. This tool handles input in any format — plain text, snake_case, kebab-case, or PascalCase — and converts it to camelCase instantly.
When to use Camel Case Converter?
Use camelCase when naming JavaScript or TypeScript variables, functions, and object properties. Java developers use it for method and field names as required by standard conventions. When building REST APIs, camelCase is the most common format for JSON response keys. Frontend developers converting CSS property names (like background-color) to their JavaScript equivalents (backgroundColor) need this conversion regularly.
Students learning programming can use it to practise proper naming. If you need the first letter capitalised too, use the Pascal Case Converter. For Python-style naming, try the Snake Case Converter.
How to use this tool
- 1Paste your text or phrase
- 2Click 'Convert' to get camelCase output
- 3Copy and use in your code
The tool automatically detects word boundaries from spaces, hyphens, underscores, and existing uppercase transitions. You can paste text in any format and it will produce clean camelCase output ready for your code.
Examples
| Input | Output |
|---|---|
| hello world | helloWorld |
| first name | firstName |
| background-color | backgroundColor |
| user_id | userId |
| THE QUICK BROWN FOX | theQuickBrownFox |
Rules & Behavior
- The first word is converted entirely to lowercase. This distinguishes camelCase from PascalCase, where the first letter is also capitalised.
- Each subsequent word starts with a capital letter and the rest of its letters are lowercase. This creates the characteristic 'humps' that give camelCase its name.
- All separators — spaces, hyphens, underscores, and dots — are removed during conversion. The uppercase letters at word boundaries serve as the only visual separator in the output.
Related Tools
Frequently Asked Questions
What is camelCase?
camelCase is a naming convention where words are joined without spaces, and each word after the first begins with a capital letter. For example, 'first name' becomes 'firstName'. The name comes from the uppercase letters in the middle resembling a camel's humps. It is one of the most widely used naming patterns in software development.
When is camelCase used in programming?
camelCase is the standard naming convention in JavaScript (variables, functions), TypeScript, Java (methods, fields), and JSON keys. Most REST API response bodies use camelCase for property names. It is also the default for Objective-C method names and Swift variable names. Our tool converts from any input format to camelCase instantly.
What's the difference between camelCase and PascalCase?
In camelCase, the first letter is lowercase (myVariable). In PascalCase, the first letter is uppercase (MyVariable). PascalCase is used for class names, React component names, and TypeScript interfaces. camelCase is used for variables, functions, and object properties. The two are closely related but serve different purposes.
Can I convert snake_case to camelCase?
Yes. Paste any snake_case text (like user_first_name) and the tool will split it at underscores and convert it to camelCase (userFirstName) instantly. It also handles kebab-case input (user-first-name), dot.case, and even mixed formats. The converter detects all common word separators automatically.
Does it handle numbers?
Yes, numbers are preserved in the output exactly as they appear in the input. For example, 'item 2 count' becomes 'item2Count'. Numbers do not trigger word boundaries on their own, so they remain attached to the preceding word segment.