119 lines
3.5 KiB
Markdown
119 lines
3.5 KiB
Markdown
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# package-json [](https://travis-ci.org/sindresorhus/package-json)
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> Get metadata of a package from the npm registry
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## Install
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```
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$ npm install package-json
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```
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## Usage
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```js
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const packageJson = require('package-json');
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(async () => {
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console.log(await packageJson('ava'));
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//=> {name: 'ava', ...}
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// Also works with scoped packages
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console.log(await packageJson('@sindresorhus/df'));
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})();
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```
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## API
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### packageJson(packageName, options?)
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#### packageName
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Type: `string`
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Name of the package.
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#### options
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Type: `object`
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##### version
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Type: `string`<br>
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Default: `latest`
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Package version such as `1.0.0` or a [dist tag](https://docs.npmjs.com/cli/dist-tag) such as `latest`.
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The version can also be in any format supported by the [semver](https://github.com/npm/node-semver) module. For example:
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- `1` - Get the latest `1.x.x`
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- `1.2` - Get the latest `1.2.x`
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- `^1.2.3` - Get the latest `1.x.x` but at least `1.2.3`
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- `~1.2.3` - Get the latest `1.2.x` but at least `1.2.3`
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##### fullMetadata
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Type: `boolean`<br>
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Default: `false`
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By default, only an abbreviated metadata object is returned for performance reasons. [Read more.](https://github.com/npm/registry/blob/master/docs/responses/package-metadata.md)
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##### allVersions
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Type: `boolean`<br>
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Default: `false`
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Return the [main entry](https://registry.npmjs.org/ava) containing all versions.
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##### registryUrl
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Type: `string`<br>
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Default: Auto-detected
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The registry URL is by default inferred from the npm defaults and `.npmrc`. This is beneficial as `package-json` and any project using it will work just like npm. This option is **only** intended for internal tools. You should **not** use this option in reusable packages. Prefer just using `.npmrc` whenever possible.
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##### agent
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Type: `http.Agent | https.Agent | object | false`
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Overwrite the `agent` option that is passed down to [`got`](https://github.com/sindresorhus/got#agent). This might be useful to add [proxy support](https://github.com/sindresorhus/got#proxies).
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### packageJson.PackageNotFoundError
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The error thrown when the given package name cannot be found.
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### packageJson.VersionNotFoundError
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The error thrown when the given package version cannot be found.
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## Authentication
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Both public and private registries are supported, for both scoped and unscoped packages, as long as the registry uses either bearer tokens or basic authentication.
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## Related
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- [package-json-cli](https://github.com/sindresorhus/package-json-cli) - CLI for this module
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- [latest-version](https://github.com/sindresorhus/latest-version) - Get the latest version of an npm package
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- [pkg-versions](https://github.com/sindresorhus/pkg-versions) - Get the version numbers of a package from the npm registry
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- [npm-keyword](https://github.com/sindresorhus/npm-keyword) - Get a list of npm packages with a certain keyword
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- [npm-user](https://github.com/sindresorhus/npm-user) - Get user info of an npm user
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- [npm-email](https://github.com/sindresorhus/npm-email) - Get the email of an npm user
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---
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<div align="center">
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<b>
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<a href="https://tidelift.com/subscription/pkg/npm-package-json?utm_source=npm-package-json&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
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</b>
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<br>
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<sub>
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Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
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</sub>
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</div>
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