How To Update Item In Dynamodb Using Nodejs?

how do i update item in dynamoDB using nodejs ? here is the ITEM list from DynamoDB javascript shell - 'Items': [ { 'EmailId': 'swa@acc.com', 'flag': 1

Solution 1:

You are trying to modify the flag: { 'N': 2 } which doesnot exist. But you wanted to modify the flag: { 'N': 1 } value to 2. So try doing like this:

var params = {
                TableName: 'users',
                Key: {
                    id: {
                        'S': req.query.id
                    },
                    flag: {
                        'N': 1
                    }
                },               
                UpdateExpression: 'SET #flag =:val1',
                ExpressionAttributeNames: {
                    '#flag': 'flag' //COLUMN NAME       
                },
                ExpressionAttributeValues: {
                    ':val1': {
                        'N': 2
                    },
                }
            };
            dynamodb.updateItem(params, function(err, data) {
                if (err) {
                    console.log('Error :' + err);
                } else {
                    //subscribe(bodydata.id);
                    console.log('EndpointArn Saved successful');
                    console.log('Data :' + JSON.stringify(data.flag));
                }
            });