Text Case Converter: Master camelCase, snake_case, kebab-case (2026)

Code style matters. Whether you’re collaborating with a team using Python, building a JavaScript application, or writing CSS for a design system, consistent case conventions prevent bugs and improve readability.

But manually converting between camelCase, snake_case, and kebab-case? Error-prone. Memorizing each language’s preferences? Unnecessary.

Our Text Case Converter transforms text between all major case formats instantly—so you can focus on code quality, not string manipulation.

Understanding the 7 Major Case Types

camelCase (Lower Camel Case)

Each word starts with a capital letter except the first word. Spaces are removed.

userId, firstName, httpStatusCode

When to Use camelCase:

• JavaScript/TypeScript variables and functions: The standard convention in modern JS development
• JSON keys: Most APIs use camelCase for property names
• Method names: getUserData(), saveSettings()

Our Text Case Converter converts any text to camelCase instantly—perfect for integrating with JavaScript libraries or APIs.

PascalCase (Upper Camel Case)

Every word starts with a capital letter. No spaces.

UserId, FirstName, HttpStatusCode

When to Use PascalCase:

• Classes and Constructors: In JavaScript, class names start with uppercase
• Components: React components (UserProfile), Vue components (Header)
• Database Tables: Some ORMs use PascalCase for table names

Convert variable names or identifiers to PascalCase with our Text Case Converter for proper class naming conventions.

snake_case (Underscore Case)

Words are separated by underscores. All lowercase.

user_id, first_name, http_status_code

When to Use snake_case:

• Python variables and functions: Python’s PEP 8 style guide strongly prefers snake_case
• Database column names: Traditional SQL databases use snake_case for columns
• Configuration keys: Environment variables (API_KEY, DB_HOST) often use this format

Our Text Case Converter handles camelCase to snake_case conversion—essential when copying JavaScript code into Python projects.

kebab-case (Dash Case)

Words are separated by hyphens. All lowercase.

user-id, first-name, http-status-code

When to Use kebab-case:

• CSS class names: Standard for utility-first frameworks (Tailwind CSS)
• URL slugs: Clean, readable URLs use kebab-case
• HTML attributes: Some frameworks like Vue use kebab-case for custom directives
• File names: component-name.tsx, page-title.html

Use our Text Case Converter to generate kebab-case for CSS classes, then refine with our Slug Generator for URL-safe slugs.

UPPER (All Caps)

Every character is uppercase. Spaces remain.

USER_ID, FIRST_NAME, HTTP_STATUS_CODE

When to Use UPPER:

• Constants: Magic numbers, configuration values
• Environment variables: DATABASE_URL, API_SECRET
• Acronyms in identifiers: getHTTPStatus(), parseJSONResponse()

Our Text Case Converter converts text to uppercase instantly—great for creating configuration constants.

lower (All Lowercase)

Every character is lowercase. Spaces remain.

user_id, first_name, http_status_code

When to Use lower:

• Database column names: MySQL and PostgreSQL are case-sensitive; lowercase prevents issues
• API endpoints: RESTful APIs often use lowercase (/api/users, not /api/Users)
• Hashes and tokens: Cryptographic values (UUIDs, API keys) are typically lowercase

Title Case (Sentence Case)

Each word starts with a capital letter. Spaces remain.

User Id, First Name, Http Status Code

When to Use Title Case:

• Display text: Labels, buttons, UI messages
• Blog post titles: Readable headings
• Sentence text: When you need proper capitalization

Our Text Case Converter transforms raw text into Title Case for display purposes—no manual capitalization required.

Real-World Conversion Scenarios

Scenario 1: JavaScript to Python Integration

You’re building a full-stack application. Frontend is JavaScript (camelCase), backend is Python (snake_case).

Problem:

// Frontend API request
const data = { userName: "John", userId: 123 };

// Python backend expects snake_case keys
# Backend receives: {"userName": "John"} ❌

Solution: Paste JavaScript keys into our Text Case Converter, convert to snake_case, update your frontend:

const data = { user_name: "John", user_id: 123 }; // ✅

Scenario 2: CSS Class Naming

You’re building a CSS library with descriptive class names.

/* ❌ INCONSISTENT */
.PrimaryButton {}
.secondary-button {}
.Main_Content {}

Solution: Use our Text Case Converter to generate kebab-case class names:

/* ✅ CONSISTENT */
.primary-button {}
.secondary-button {}
.main-content {}

This matches Tailwind CSS conventions and improves maintainability.

Scenario 3: JSON API Response Formatting

Your API returns data with inconsistent naming:

{
  "UserName": "Alice",  // PascalCase
  "user_email": "alice@example.com"  // snake_case
}

Problem: Frontend developers must remember both formats.

Solution: Use our Text Case Converter to normalize to camelCase:

{
  "userName": "Alice",
  "userEmail": "alice@example.com"
}

Now frontend uses consistent data.userName and data.userEmail.

Best Practices for Code Consistency

1. Establish Team Conventions

Document your project’s case preferences. Whether using JavaScript style guides (Airbnb, Standard), Python (PEP 8), or CSS (BEM), consistency beats “perfect” conventions.

Our Text Case Converter helps enforce these conventions across teams.

2. Use Linters and Formatters

While our Text Case Converter handles one-off conversions, automated tools maintain consistency:

• JavaScript: ESLint with appropriate rules
• Python: Flake8 or Black formatter
• CSS: Stylelint

But when you need quick conversions—copy-pasting code between languages or refactoring—our tool is faster.

3. Think About Your Target

When converting, ask: “Where will this be used?”

• Variable names? → camelCase or snake_case (depends on language)
• CSS classes? → kebab-case
• Database columns? → snake_case
• API endpoints? → lower or kebab-case

Our Text Case Converter supports all these formats, so you’re never locked into one approach.

Cross-Tool Integration

Case conversion often pairs with other tools:

• JSON Formatter → Convert camelCase keys to snake_case for Python APIs
• Slug Generator → Convert Title Case to URL-friendly slugs
• Character Counter → Count characters in kebab-case class names
• YAML to JSON → Transform YAML config’s snake_case to JSON’s camelCase

These tools form a complete developer toolkit for text manipulation and code quality.

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Frequently Asked Questions

Q: How do I convert camelCase to snake_case?

A: Paste your camelCase text (like userName) into our Text Case Converter and select “snake_case.” It will convert to user_name instantly. This is essential when copying JavaScript code into Python projects or creating database column names.

Q: When should I use PascalCase instead of camelCase?

A: Use PascalCase for classes, constructors, and React/Vue component names (e.g., UserProfile, Header). Use camelCase for variables, functions, and object keys (e.g., getUserData(), userName). Our Text Case Converter supports both formats.

Q: Why is kebab-case standard for CSS?

A: kebab-case (class-name) is CSS standard because hyphens are valid HTML/CSS characters and improve readability. It’s also the default in utility-first frameworks like Tailwind CSS. Use our Text Case Converter to generate kebab-case class names from any text.

Q: Can I convert multiple lines at once?

A: Yes! Paste multiple lines of text into our Text Case Converter, and each line will be converted individually. This is useful for batch renaming variables, function names, or CSS classes.

Q: What’s the difference between snake_case and kebab-case?

A: Both separate words with special characters (underscores vs hyphens). snake_case (variable_name) is preferred in Python and SQL. kebab-case (variable-name) is preferred in CSS and URLs. Our Text Case Converter supports both formats.

Q: How do I convert API responses from PascalCase to camelCase?

A: Many APIs return PascalCase (like {"UserName": "Alice"}). Paste this into our Text Case Converter, select “camelCase,” and it will transform to {"userName": "Alice"}. Use our JSON Formatter to pretty-print the result.

Q: Why does Title Case capitalize every word?

A: Title Case capitalizes every word for headings and display text. This differs from sentence case, which only capitalizes the first word and proper nouns. Use our Text Case Converter when you need properly capitalized UI labels, titles, or messages.

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Start Converting Case Instantly

Stop manually changing string casing. Whether you’re converting between programming languages, renaming variables, or creating CSS class names, our Text Case Converter handles all formats.

Try it now:

• Convert camelCase to snake_case - For Python integration
• Convert snake_case to camelCase - For JavaScript APIs
• Convert to kebab-case - For CSS classes
• Generate Title Case - For display text

Instant conversion. All major formats. Perfect for code consistency.

Explore all 21 free tools at Hasare.

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