How to create Azure logic app initialize variable after parse json action

i have a logic app in azure. i'm currently stuck in initialize expression variable after parse json. i want to catch "appId" parameter but all i get is null despite the fact that parse json giving an outout, so it seems that i I'm not expressing the right syntax.

this is my JSON output in parse JSON step

{
  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#servicePrincipals",
  "value": [
    {
      "id": "***********************",
      "deletedDateTime": null,
      "accountEnabled": true,
      "alternativeNames": [],
      "appDisplayName": "testapp",
      "appDescription": null,
      "appId": "******************************",
      "applicationTemplateId": null,
      "appOwnerOrganizationId": "****************************",
      "appRoleAssignmentRequired": false,
      "createdDateTime": "2024-06-23T10:24:17Z",
      "description": null,
      "disabledByMicrosoftStatus": null,
      "displayName": "testapp",
      "homepage": null,
      "loginUrl": null,
      "logoutUrl": null,
      "notes": null,
      "notificationEmailAddresses": [],
      "preferredSingleSignOnMode": null,
      "preferredTokenSigningKeyThumbprint": null,
      "replyUrls": [],
      "servicePrincipalNames": [
        "********************************"
      ],
      "servicePrincipalType": "Application",
      "signInAudience": "AzureADMyOrg",
      "tags": [
        "HideApp",
        "WindowsAzureActiveDirectoryIntegratedApp"
      ],
      "tokenEncryptionKeyId": null,
      "samlSingleSignOnSettings": null,
      "addIns": [],
      "appRoles": [],
      "info": {
        "logoUrl": null,
        "marketingUrl": null,
        "privacyStatementUrl": null,
        "supportUrl": null,
        "termsOfServiceUrl": null
      },
      "keyCredentials": [],
      "oauth2PermissionScopes": [],
      "passwordCredentials": [],
      "resourceSpecificApplicationPermissions": [],
      "verifiedPublisher": {
        "displayName": null,
        "verifiedPublisherId": null,
        "addedDateTime": null
      }
    },
    {
      "id": "**********************8",
      "deletedDateTime": null,
      "accountEnabled": true,
      "alternativeNames": [
        "isExplicit=False",
        "/subscriptions/******************************************/resourcegroups/Test-RG/providers/Microsoft.Logic/workflows/test"
      ],
      "appDisplayName": null,
      "appDescription": null,
      "appId": "******************",
      "applicationTemplateId": null,
      "appOwnerOrganizationId": null,
      "appRoleAssignmentRequired": false,
      "createdDateTime": "2024-07-11T09:32:51Z",
      "description": null,
      "disabledByMicrosoftStatus": null,
      "displayName": "testeldad",
      "homepage": null,
      "loginUrl": null,
      "logoutUrl": null,
      "notes": null,
      "notificationEmailAddresses": [],
      "preferredSingleSignOnMode": null,
      "preferredTokenSigningKeyThumbprint": null,
      "replyUrls": [],
      "servicePrincipalNames": [
        "***********************",
        "https://identity.azure.net/*******************/**********************"
      ],
      "servicePrincipalType": "ManagedIdentity",
      "signInAudience": null,
      "tags": [],
      "tokenEncryptionKeyId": null,
      "info": null,
      "samlSingleSignOnSettings": null,
      "addIns": [],
      "appRoles": [],
      "keyCredentials": [
        {
          "customKeyIdentifier": "*****************",
          "displayName": "CN=**********************",
          "endDateTime": "2024-10-09T09:27:00Z",
          "key": null,
          "keyId": "*********************",
          "startDateTime": "2024-07-11T09:27:00Z",
          "type": "AsymmetricX509Cert",
          "usage": "Verify"
        }
      ],
      "oauth2PermissionScopes": [],
      "passwordCredentials": [],
      "resourceSpecificApplicationPermissions": [],
      "verifiedPublisher": {
        "displayName": null,
        "verifiedPublisherId": null,
        "addedDateTime": null
      }
    }
  ]
}

i tried using that syntax --> first(outputs('Parse_JSON')?['body/value'])['appId'] and many many more :)

I'm using "first" coz there is a few appId instances in the output so i want to catch the first part. (don't know if it's the right way)

this is the compose result -

Solution

To get the first appId, instead of first(outputs('Parse_JSON')?['body/value'])['appId'] you should use this:

body('Parse_JSON')?['value']?[0]?['appId']

Testing:

Update:

Parsing the JSON before extracting field values is, strictly speaking, not required. For example, you are receiving a JSON content in the output of the HTTP action:

You can get the appId value from there as follows:

body('HTTP')?['value']?[0]?['appId']