Text Case Converter

Case styles and when to use them

Different ecosystems standardize on specific casing conventions. Reformatting strings quickly prevents typos when moving data between languages, databases, or front-end frameworks.

Style Example Popular usage
camelCase myVariableName JavaScript variables, JSON keys
PascalCase MyVariableName TypeScript/Java class names, C# methods
snake_case my_variable_name Python constants, PostgreSQL columns
kebab-case my-variable-name CSS classes, file slugs, static site URLs

Best practices for text transformations

Clean strings before sending them to other systems. Consistent formatting prevents bugs in API payloads, command-line utilities, and commit messages.

Collapse whitespace

Replace multiple spaces with single spaces when preparing user input for database storage or slug generation.

Normalize line endings

Convert between Windows (\r\n) and Unix (\n) endings to prevent diff noise across platforms.

Guard against Unicode surprises

Normalize to NFC or strip emoji when integrating with legacy systems that only accept ASCII.

Reuse a text transformation

The JavaScript example returns hello_world. The Python example returns helloWorldExample. These are different naming conventions; compare with the format your application expects.

JavaScript

function toSnakeCase(value) {
  return value
    .trim()
    .replace(/[\s_-]+/g, ' ')
    .toLowerCase()
    .replace(/[^\w\s]/g, '')
    .replace(/\s+/g, '_');
}

console.log(toSnakeCase('Hello World!'));

Python

import re

def to_camel_case(value: str) -> str:
    words = re.sub(r'[\s_-]+', ' ', value.strip()).split()
    if not words:
        return ''
    first, *rest = words
    return first.lower() + ''.join(word.capitalize() for word in rest)

print(to_camel_case('Hello world example'))

Text tool FAQ

What is the difference between camelCase and PascalCase?

camelCase starts with a lowercase character while PascalCase capitalizes every word. Both remove spaces for compact variable and type names.

When should I use snake_case or kebab-case?

Choose snake_case for Python, SQL, and configuration files. Prefer kebab-case for web assets such as CSS classes, file slugs, or static routes.

Does the tool modify my text on a server?

No. Transformations run entirely in the browser, so sensitive snippets, API keys, or credentials remain private.

How can I normalize whitespace?

Use the whitespace action to collapse runs of whitespace. This changes line breaks too; keep the original if paragraph boundaries matter. It is not a lossless line-ending converter.

Can I automate these transformations in code?

Yes. Copy the provided JavaScript or Python snippets to integrate case conversion into build scripts, data pipelines, or editor extensions.

Choose a developer tool

More tools for data, text and testing

Run the AES interoperability guide or read how these tools are checked.