dynamodb JavaScript

function getItem(){
    const params = {
      TableName: "",
      Key:{
        id: ""
      },
      ProjectionExpression:"#role",
      ExpressionAttributeNames:{
        '#role':'role'
      }
    };
    return new Promise((resolve, reject)=>{
      dynamodb.get(params, (error, result) => {
        if (error) {
          reject(err);
        }
        else {
          resolve(result)
        }
      });
    });
  }