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# validate-npm-package-name Give me a string and I'll tell you if it's a valid `npm` package name. This package exports a single synchronous function that takes a `string` as input and returns an object with two properties: - `validForNewPackages` :: `Boolean` - `validForOldPackages` :: `Boolean` ## Contents - [Naming rules](#naming-rules) - [Examples](#examples) + [Valid Names](#valid-names) + [Invalid Names](#invalid-names) - [Legacy Names](#legacy-names) - [Tests](#tests) - [License](#license) ## Naming Rules Below is a list of rules that valid `npm` package name should conform to. - package name length should be greater than zero - all the characters in the package name must be lowercase i.e., no uppercase or mixed case names are allowed - package name can consist of hyphens - package name must not contain any non-url-safe characters (since name ends up being part of a URL) - package name should not start with `.` or `_` - package name should not contain any leading or trailing spaces - package name should not contain any of the following characters: `~)('!` - package name cannot* be the same as a node.js/io.js core module nor a reserved/blacklisted name. For example, the following names are invalid: + http + stream + node_modules + favicon.ico - package name length cannot exceed 214 ## Examples ### Valid Names ```js var validate = require("validate-npm-package-name") validate("some-package") validate("example.com") validate("under_score") validate("123numeric") validate("excited!") validate("@npm/thingy") validate("@jane/foo.js") ``` All of the above names are valid, so you'll get this object back: ```js { validForNewPackages: true, validForOldPackages: true } ``` ### Invalid Names ```js validate(" leading-space:and:weirdchars") ``` That was never a valid package name, so you get this: ```js { validForNewPackages: false, validForOldPackages: false, errors: [ 'name cannot contain leading or trailing spaces', 'name can only contain URL-friendly characters' ] } ``` ## Legacy Names In the old days of npm, package names were wild. They could have capital letters in them. They could be really long. They could be the name of an existing module in node core. If you give this function a package name that used to be valid, you'll see a change in the value of `validForNewPackages` property, and a warnings array will be present: ```js validate("eLaBorAtE-paCkAgE-with-mixed-case-and-more-than-214-characters-----------------------------------------------------------------------------------------------------------------------------------------------------------") ``` returns: ```js { validForNewPackages: false, validForOldPackages: true, warnings: [ "name can no longer contain capital letters", "name can no longer contain more than 214 characters" ] } ``` ## Tests ```sh npm install npm test ``` ## License ISC