Salesforce Apex code for - All fields API names in an object - Object All fields by apex code

 String SobjectApiName = 'OrderItem';//Order';

Map<String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();

Map<String, Schema.SObjectField> fieldMap = schemaMap.get(SobjectApiName).getDescribe().fields.getMap();

for(String fieldName : fieldMap.keyset())

    {

        system.debug('fieldName->>'+fieldName);// feild api names

    }

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