Expo Docs MCP Server

--- title: package.json description: A reference for Expo-specific properties that can be used in the package.json file. --- **package.json** is a JSON file that contains the metadata for a JavaScript project. This is a reference to Expo-specific properties that can be used in the **package.json** file. ## `install.exclude` The following commands perform a version check for the libraries installed in a project and give a warning when a library's version is different from the version recommended by Expo: - `npx expo start` and `npx expo-doctor` - `npx expo install` (when installing a new version of that library or using `--check` or `--fix` options) By specifying the library under the `install.exclude` array in the **package.json** file, you can exclude it from the version checks: ```json package.json { "expo": { "install": { "exclude": ["expo-updates", "expo-splash-screen"] } } } ``` ## `autolinking` Allows configuring module resolution behavior by using `autolinking` property in **package.json**. For complete reference, see [Autolinking configuration](/modules/autolinking/#configuration). ## `doctor` Allows configuring the behavior of the [`npx expo-doctor`](/develop/tools/#expo-doctor) command. <PaddedAPIBox> ### `reactNativeDirectoryCheck` By default, Expo Doctor validates your project's packages against the [React Native directory](https://reactnative.directory/). This check throws a warning with a list of packages that are not included in the React Native Directory. You can customize this check by adding the following configuration in your project's **package.json** file: ```json package.json { "expo": { "doctor": { "reactNativeDirectoryCheck": { /* @info Use this option to disable/enable the check. */ "enabled": true, /* @end */ /* @info Use this option to exclude specific packages. */ "exclude": ["/foo/", "bar"], /* @end */ /* @info Use this option to disable/enable listing unknown packages. */ "listUnknownPackages": true /* @end */ } } } } ``` By default, the check is enabled and unknown packages are listed. ### `appConfigFieldsNotSyncedCheck` Expo Doctor checks if your project includes native project directories such as **android** or **ios**. If these directories exist but are not listed in your **.gitignore** or [**.easignore**](/build-reference/easignore) files, Expo Doctor verifies the presence of an app config file. If this file exists, it means your project is configured to use [Prebuild](/workflow/prebuild). When the **android** or **ios** directories are present, EAS Build does not sync app config properties to the native projects. Expo Doctor throws a warning if these conditions are true. You can disable or enable this check by adding the following configuration to your project's **package.json** file: ```json package.json { "expo": { "doctor": { "appConfigFieldsNotSyncedCheck": { "enabled": false } } } } ``` </PaddedAPIBox>