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NPM: How to Install Specific Version of a Module

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二03 | 时间 2017 | 作者 红领巾 ] 0人收藏点击收藏

Newcomers to Node and NPM often ask how to install a specific version of a certain NPM package. There are several ways to accomplish this. First, let's start with the basic NPM CLI syntax:

npm install lodash

This command installs lodash in the current folder and fetches the latest available version.

If you know the exact version of the package , you can append it to the package name after the @ character:

npm install [email protected]

You can look up the latest version for any NPM package at npmjs.com .

If you don't know the exact version of the package , NPM allows using semantic ranges to define the version. For example,

npm install lodash@^4.0.0

This command will install the latest 4.x.x version. You can learn more about the syntax of semantic versioning at docs.npmjs.com .

Both aforementioned examples don't modify package.json and don't add installed modules to the list of dependencies. Use --save to add the installed module to the package.json 's dependencies and --save-dev to add it to devDependencies . If you install a module without defining a specific version (i.e. without any version or using a semantic range), NPM will add the semantic range to the package.json as is. To prevent this, use --save-exact flag in addition to --save or --save-dev . This flag will force NPM to store the exact module version in the package.json.

Examples npm install lodash --save --save-exact - installs the latest version and saves the exact version in the dependencies in the package.json. npm install lodash --save-dev --save-exact - installs the latest version and saves the exact version in the devDependencies map in the package.json. npm install lodash --save - installs the latest version and saves the semantic range in the dependencies in the package.json. E.g. "lodash": "^4.17.4" . Caveats Specifying --save-exact alone is not sufficient. You need to define both flags --save or --save-exact and --save-exact . --save , --save-exact , --save-dev obviously don't work together with the -g flag which installs the module globally.

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