# Constant Case [![NPM version][npm-image]][npm-url] [![NPM downloads][downloads-image]][downloads-url] [![Bundle size][bundlephobia-image]][bundlephobia-url] > Transform into upper case string with an underscore between words. ## Installation ``` npm install constant-case --save ``` ## Usage ```js import { constantCase } from "constant-case"; constantCase("string"); //=> "STRING" constantCase("dot.case"); //=> "DOT_CASE" constantCase("PascalCase"); //=> "PASCAL_CASE" constantCase("version 1.2.10"); //=> "VERSION_1_2_10" ``` The function also accepts [`options`](https://github.com/blakeembrey/change-case#options). ## License MIT [npm-image]: https://img.shields.io/npm/v/constant-case.svg?style=flat [npm-url]: https://npmjs.org/package/constant-case [downloads-image]: https://img.shields.io/npm/dm/constant-case.svg?style=flat [downloads-url]: https://npmjs.org/package/constant-case [bundlephobia-image]: https://img.shields.io/bundlephobia/minzip/constant-case.svg [bundlephobia-url]: https://bundlephobia.com/result?p=constant-case