原生node，接收ajax传过来的base64图片太大，被截断了

Question

原生node，接收ajax传过来的base64图片太大，被截断了，是不是原生node在哪里做了大小限制了，在哪配置大小呢 ？
相关代码

 req.on("data",function(data){
        var currentData = ""
        currentData += data;
        postData = qs.parse(currentData);//这里的postData没显示完全

        saveImage(postData.smallImage,0)
        saveImage(postData.bigImage,1)
        postData.smallImage = smallImageLink
        postData.bigImage = bigImageLink
        postData.character = postData.character.split(',')
        addData(postData)
    });

Answer 1

var currentData = ""
req.on("data",function(data){
currentData += data;
});
req.on("end",function(data){
var postData = qs.parse(currentData);
});