将DynamoDB响应转换为JSON

下面是我对dynamoDB的查询

var parse = AWS.DynamoDB.Converter.output;

b.query(params, function(err, results)  {
    if (err) {
        console.error("Unable to query. Error:", JSON.stringify(err, null, 2));
        //callback(err);
    } else {
        console.log("Query succeeded.");
        console.log(JSON.stringify(results.Items));
        callback(null, results.Items);
        results.Items.forEach(function(element, index, array) {
        console.log( parse({"M": element.data.M }));
    });
    }
});

我的DynamoDB的回复是“results.Items”，如下所示

[{"id":{"S":"arena-MXHGMYzBBP5F6jztnLUdCL"},"data":{"M":{"phaseAngle":{"L":[{"N":"5.0753"},{"N":"5.0506"},{"N":"5.0267"},{"N":"5.0027"},{"N":"4.9793"},{"N":"4.9558"},{"N":"4.9319"},{"N":"4.9077"},{"N":"4.8835"},{"N":"4.8593"}]},"unitID":{"S":"arena-MXHGMYzBBP5F6jztnLUdCL"},"type":{"S":"DATA"},"version":{"S":"1.0.0"},"timestamp":{"N":"1582920097000"},"frequency":{"L":[{"N":"59.9596"},{"N":"59.9635"},{"N":"59.9619"},{"N":"59.9632"},{"N":"59.9616"},{"N":"59.9621"},{"N":"59.9619"},{"N":"59.9613"},{"N":"59.9613"},{"N":"59.9608"}]},"voltage":{"L":[{"N":"122.5669"},{"N":"122.5473"},{"N":"122.5593"},{"N":"122.5627"},{"N":"122.5382"},{"N":"122.5328"},{"N":"122.5758"},{"N":"122.5376"},{"N":"122.526"},{"N":"122.5364"}]}}},"timestamp":{"S":"1582920097000"}}]

我想把它转换成普通的JSON，类似这样的东西

[{"id":{"S":"arena-MXHGMYzBBP5F6jztnLUdCL"},"data":{"M":{"phaseAngle":{"L":[{"N":"5.0753"},{"N":"5.0506"},{"N":"5.0267"},{"N":"5.0027"},{"N":"4.9793"},{"N":"4.9558"},{"N":"4.9319"},{"N":"4.9077"},{"N":"4.8835"},{"N":"4.8593"}]},"unitID":{"S":"arena-MXHGMYzBBP5F6jztnLUdCL"},"type":{"S":"DATA"},"version":{"S":"1.0.0"},"timestamp":{"N":"1582920097000"},"frequency":{"L":[{"N":"59.9596"},{"N":"59.9635"},{"N":"59.9619"},{"N":"59.9632"},{"N":"59.9616"},{"N":"59.9621"},{"N":"59.9619"},{"N":"59.9613"},{"N":"59.9613"},{"N":"59.9608"}]},"voltage":{"L":[{"N":"122.5669"},{"N":"122.5473"},{"N":"122.5593"},{"N":"122.5627"},{"N":"122.5382"},{"N":"122.5328"},{"N":"122.5758"},{"N":"122.5376"},{"N":"122.526"},{"N":"122.5364"}]}}},"timestamp":{"S":"1582920097000"}}]

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我使用了AWS.DynamoDB.Converter.output；和parse（{“M”：element.data.M}）给出了完美的json，但我无法返回该输出。有什么帮助建议吗？谢谢

解决方案： 导入这个

var unmarshalItem=require（'dynamodb-marshaler'）。unmarshalItem
我在“results.Items”中得到了响应，现在您可以这样做以完美地获得正常的json格式

var items = results.Items.map(unmarshalItem);
        console.log(items);
        callback(null, items);

但是我看到这个npm软件包被弃用了，所以我将尝试使用最新的
DynamoDB/Converter
进行更新。
“但是我无法返回该输出。”为什么？听起来你已经找到了解决方案，但因为其他问题而放弃了？@MarkB嘿，我的意思是我能够返回那个输出，但是
AWS.DynamoDB.Converter.output这对我来说是不对的。经过更多的搜索，我找到了
（'dynamodb-marshaler'）。解组项目
这为我实现了转换的技巧//这对你有用吗。解组应该由库本身为您处理。