The sample JSON provided on the ArcGIS REST APIs: Add To Definition (Feature Layer) for adding new fields contains errors, resulting in failure to add fields through the admin API.

Solution de contournement

Modify the JSON by removing 50/1 after the GlobalID field and removing single quotes from 'A' in the default value of the "str2" field.

{ 

"fields": [ 

{ 

"name": "GlobalID", 50/1 

"type": "esriFieldTypeGlobalID", 

"alias": "GlobalID", 

"nullable": false, 

"editable": false 

}, 

{ 

"name": "date1", 

"type": "esriFieldTypeDate", 

"alias": "date1", 

"nullable": true, 

"editable": false, 

"domain": null, 

"defaultValue": "GetDate() WITH VALUES" 

}, 

{ 

"name": "str2", 

"type": "esriFieldTypeString", 

"alias": "str2", 

"nullable": true, 

"editable": true, 

"domain": null, 

"defaultValue": "'A' WITH VALUES" 

} 

] 

} 

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