String 打开时base64解码图像错误,NodeJS

String 打开时base64解码图像错误,NodeJS,string,image,base64,decode,String,Image,Base64,Decode,我正在接收字符串base64编码,当我尝试解码并保存到图像文件时,似乎一切正常,但当我下载打开文件时,我的查看器无法识别它。 我知道我的字符串是有效的图像,因为我使用 它给了我正确的图像。 我有什么遗漏吗 var imagestring = "/9j/2wCEAA0JCQsJCA0LCgsODQ0PEx8UExEREyYbHRcfLSgwLy0oLCsyOEg9MjVENissP1U/REpNUFFQMDxYX1hOXkhPUE0BDQ4OExATJRQUJU00LDRNTU1NTU1N

我正在接收字符串base64编码,当我尝试解码并保存到图像文件时,似乎一切正常,但当我下载打开文件时,我的查看器无法识别它。 我知道我的字符串是有效的图像,因为我使用 它给了我正确的图像。 我有什么遗漏吗

    var imagestring = "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";
var decodedImage = new Buffer(imagestring, 'base64');
fs.writeFile('imagedecoded.jpg', decodedImage , function(err) {}); 

是不是应该是
fs.writeFile('imagedecoded.jpg,decodedImage)
?是的,对不起,谢谢你的建议,我更新了问题。但还是有同样的问题。打开文件时会显示一个错误。但我知道这是一个有效的图像,因为使用freeformatter online,我可以成功地解码它。我认为base64字符串不是一个有效的图像<代码>http://codebeautify.org/base64-to-image-converter您可以用它来测试base64编码的字符串。但是为什么这个转换器工作得很好呢?