# app.json5 Configuration File


This document gives an overview of the **app.json5** configuration file. To start with, let's go through an example of what this file contains.

```json
{
  "app": {
    "bundleName": "com.application.myapplication",
    "vendor": "example",
    "versionCode": 1000000,
    "versionName": "1.0.0",
    "icon": "$media:app_icon",
    "label": "$string:app_name",
    "description": "$string:description_application",
    "minAPIVersion": 9,
    "targetAPIVersion": 9,
    "apiReleaseType": "Release",
    "debug": false,
    "car": {
      "minAPIVersion": 8,
    },
    "targetBundleName": "com.application.test",
    "targetPriority": 50
  },
}
```


As shown above, the **app.json5** file contains several tags.


  **Table 1** Tags in the app.json5 file

| Name| Description| Data Type| Initial Value Allowed|
| -------- | -------- | -------- | -------- |
| bundleName | Bundle name, which uniquely identifies an application.  The value must comply with the following rules:<br>- Consists of letters, digits, underscores (_), and periods (.).<br>- Starts with a letter.<br>- Contains 7 to 127 bytes.<br>You are advised to use the reverse domain name notation, for example, *com.example.demo*, where the first part is the domain suffix **com**, the second part is the vendor/individual name, and the third part is the application name, which can be of multiple levels.<br>If an application is built with the system source code, you are advised to name it in *com.ohos.demo* notation, where **ohos** signifies that the application is an OpenHarmony system application.| String| No|
| bundleType| Bundle type, which is used to distinguish applications and atomic services.  <br>- **app**: The bundle is a common application.<br>- **atomicService**: The bundle is an atomic service.<br>- **shared**: The bundle is a shared object application.| String| Yes (initial value: **"app"**)|
| debug | Whether the application can be debugged. This tag is generated during compilation and building in DevEco Studio.<br>- **true**: The application can be debugged.<br>- **false**: The application cannot be debugged.| Boolean| Yes (initial value: **false**)|
| icon | [Icon of the application](../application-models/application-component-configuration-stage.md). The value is an icon resource index.| String| No|
| label | [Name of the application](../application-models/application-component-configuration-stage.md). The value is a string resource index.| String| No|
| description | Description of the application. The value is a string with a maximum of 255 bytes or a resource index to the description.| String| Yes (initial value: left empty)|
| vendor | Vendor of the application. The value is a string with a maximum of 255 bytes.| String| Yes (initial value: left empty)|
| versionCode | Version number of the application. The value is a 32-bit non-negative integer less than 2 to the power of 31. It is used only to determine whether a version is later than another version. A larger value indicates a later version. Ensure that a new version of the application uses a value greater than any of its predecessors.  | Number| No|
| versionName | Version number of the application displayed to users.<br>The value consists of only digits and dots. The four-part format *A.B.C.D* is recommended, wherein:<br>Part 1 (*A*): major version number, which ranges from 0 to 99. A major version consists of major new features or large changes.<br>Part 2 (*B*): minor version number, which ranges from 0 to 99. A minor version consists of some new features and large bug fixes.<br>Part 3 (*C*): feature version number, which ranges from 0 to 99. A feature version consists of scheduled new features.<br>Part 4 (*D*): maintenance release number or patch number, which ranges from 0 to 999. A maintenance release or patch consists of resolution to security flaws or minor bugs.<br>The value contains a maximum of 127 bytes.| String| No|
| minCompatibleVersionCode | Minimum compatible version of the application. It is used to check whether the application is compatible with a version on other devices in the cross-device scenario.| Number| Yes (initial value: value of **versionCode**)|
| minAPIVersion | Minimum API version required for running the application.| Number| Yes (initial value: value of **compatibleSdkVersion** in **build-profile.json5**)|
| targetAPIVersion | Target API version required for running the application.| Number| Yes (initial value: value of **compileSdkVersion** in **build-profile.json5**)|
| apiReleaseType | Type of the target API version required for running the application. The value can be **"CanaryN"**, **"BetaN"**, or **"Release"**, where **N** represents a positive integer.<br>- **Canary**: indicates a restricted release.<br>- **Beta**: indicates a publicly released beta version.<br>- **Release**: indicates a publicly released official version.<br>The value is set by DevEco Studio reading the stage of the SDK in use.| String| Yes (initial value: set by DevEco Studio)|
| multiProjects | Whether the application supports joint development of multiple projects.<br>- **true**: The application supports joint development of multiple projects.<br>- **false**: The application does not support joint development of multiple projects.  | Boolean| Yes (initial value: **false**)|
| asanEnabled | Whether to enable AddressSanitizer (ASan) to detect memory corruption issues such as buffer overflows.<br>- **true**: ASan is enabled.<br>- **false**: ASan is disabled. Note that ASan is not available in the Release version.| Boolean| Yes (initial value: **false**)|
| tablet | Tablet-specific configuration, which includes the **minAPIVersion** attribute.<br>When running on tablets, the application applies the attribute settings under this tag and ignores the general counterparts.| Object| Yes (initial value: general settings in the **app.json5** file)|
| tv | TV-specific configuration, which includes the **minAPIVersion** attribute.<br>When running on TVs, the application applies the attribute settings under this tag and ignores the general counterparts.| Object| Yes (initial value: general settings in the **app.json5** file)|
| wearable | Wearable-specific configuration, which includes the **minAPIVersion** attribute.<br>When running on wearables, the application applies the attribute settings under this tag and ignores the general counterparts.| Object| Yes (initial value: general settings in the **app.json5** file)|
| car | Head unit–specific configuration, which includes the **minAPIVersion** attribute.<br>When running on head units, the application applies the attribute settings under this tag and ignores the general counterparts.| Object| Yes (initial value: general settings in the **app.json5** file)|
| default | Default device–specific configuration, which includes the **minAPIVersion** attribute.<br>When running on default devices, the application applies the attribute settings under this tag and ignores the general counterparts.| Object| Yes (initial value: general settings in the **app.json5** file)|
|targetBundleName|Target application name of the bundle. The value rule and range are the same as those of **bundleName**.|String|Yes (if the initial value is used, the target application is not an application with the overlay feature)|
|targetPriority|Priority of the application. When **targetBundleName** is set, the application is an application with the overlay feature. The value ranges from 1 to 100.|Number|Yes (initial value: **1**)|
|generateBuildHash |Whether the hash values of all HAP and HSP files of the application are generated by the packaging tool. The hash values (if any) are used to determine whether the application needs to be updated when the system is updated in OTA mode but the **versionCode** value of the application remains unchanged.<br>If this tag is set to **true**, the packaging tool generates hash values for all HAP and HSP files of the application.<br>**NOTE**<br>**This tag applies only to system applications.**|Boolean|Yes (initial value: **false**)|