Case Converter: camelCase, snake_case & kebab-case — 9 Styles at Once

API JSON keys use snake_case, TypeScript variables use camelCase, CSS classes and URLs use kebab-case, environment variables use CONSTANT_CASE — several naming conventions always coexist in real projects. The Case Converter takes one identifier and shows it converted into all nine naming styles simultaneously, entirely in your browser.

The nine supported styles

Style	Example	Typical use
camelCase	helloWorld	JavaScript/TypeScript variables & functions
PascalCase	HelloWorld	Class names, types, React components
snake_case	hello_world	Python variables, DB columns, API JSON keys
CONSTANT_CASE	HELLO_WORLD	Constants, environment variables
kebab-case	hello-world	CSS classes, URL slugs, file names
dot.case	hello.world	Config keys, property paths
path/case	hello/world	File paths, routes
Title Case	Hello World	Headings, document titles
Sentence case	Hello world	UI copy, descriptions

Two modes

Quick convert: one identifier, nine styles

Type an identifier and all nine conversions render in real time. “What should this API response key be called on the TypeScript side?” becomes a one-glance answer, with one-click copy on every result.

Bulk convert: a whole list into one style

Paste a multi-line list, pick the target style, and every line converts at once. Blank lines are preserved, so the output stays line-aligned with whatever you pasted — handy for turning a list of DB column names into TypeScript property names, or a constants list into environment variable names.

Smart word-boundary detection

Rather than doing naive replacement, the converter tokenizes the input into words first, then rebuilds in the target style. That makes the tricky cases come out right:

• Acronym runs: HTTPServerError → http_server_error. HTTP is recognized as one word
• Digits: base64Encode → base64_encode. Digits stay attached to their neighboring word instead of splitting off
• Mixed separators: input like user-profile_imageURL — hyphens, underscores and camel boundaries mixed together — is decomposed into words and reassembled cleanly

Your input never leaves the browser

All conversion happens in browser JavaScript; nothing you type is sent to a server. Internal API field names and unreleased schema details are safe to paste.

FAQ

How are acronym runs like HTTP or URL handled?

HTTPServer is recognized as the two words http and server. Consecutive capitals split just before the final “capital + lowercase” pair, so XMLHttpRequest decomposes correctly into xml / http / request.

How are identifiers containing digits converted?

Digits are treated as part of the adjacent word. base64Encode becomes the two words base64 and encode — base64_encode in snake_case. Digits never split off into a word of their own.

Can I convert multiple lines at once?

Yes — paste a list into bulk mode and pick the target style. Blank lines are preserved as-is, so the line correspondence with your source list is never lost.

Is anything I type sent anywhere?

No. Conversion runs entirely in your browser; your input is never transmitted to a server.