Rename variables across naming styles

The job

Codebases disagree on naming. The API returns snake_case keys, the linter wants camelCase variables, and CSS classes want kebab-case. Doing this by hand is fine for two names; for forty it is error-prone. The identifier case converter takes a whole list at once — paste the names, pick the style, copy the result.

Converting a list

Paste one identifier per line. Blank lines pass through so you can keep groups visually separated. Pick the target — camelCase for JavaScript variables, snake_case for Python or database columns, PascalCase for classes, kebab-case for CSS class names or URL parts, SCREAMING for constants.

• Mixed input is fine: `userName`, `user_name`, and `User-Name` all detect the same two words.
• Acronyms split cleanly: `XMLHttpRequest` becomes `xml_http_request` in snake, not `x_m_l_http_request`.
• Digits split from letters: `utf8` converts as the two words `utf` and `8`.

Worked example

A JSON payload has keys `user_name`, `created_at`, `avatar_url`. For a TypeScript interface you paste the three names, pick camelCase, and get `userName`, `createdAt`, `avatarUrl` — ready to drop into the interface definition.

Where it stops

It converts words, not files — it won't rename symbols across your codebase; use your editor's rename refactor for that. Up to 200,000 characters and 5,000 lines per run, and everything happens in the browser, so even a private API name list never leaves the machine.