使用 node.js 将 JSON 上传到 s3 的问题

Question

I am new to amazon s3 and am trying to use node.js to upload JSON into a file. My object is users , and it has a bunch of keys and values in it. Here is how I'm uploading it:

 s3.putObject({Bucket: 'currenteventstest',Key: 'users.json',Body: users, ContentType: "application/json"});

However, when I re download it, it's just an empty object.

Answer 1

Adding a callback function fixes the problem:

s3.putObject({
  Bucket: 'currenteventstest',
  Key: 'users.json',
  Body: JSON.stringify(users),
  ContentType: "application/json"},
  function (err,data) {
    console.log(JSON.stringify(err) + " " + JSON.stringify(data));
  }
);

Answer 2

I don't have enough reputation to comment, but for what its worth with the new aws-sdk version you can use the promise chain when posting the JSON instead of a callback:

try{
   await s3.putObject({
        Bucket: 'currenteventstest',
        Key: 'users.json',
        Body: JSON.stringify(users),
        ContentType: 'application/json; charset=utf-8'
    }).promise();
}
catch(e){
   throw e
}

Answer 3

JSON.stringify is the way to create a JSON file on S3.

AWS accepts serialized JSON string as Body.

s3.putObject({
    Bucket: 'currenteventstest',
    Key: 'users.json',
    Body: JSON.stringify(users),
    ContentType: 'application/json; charset=utf-8'
});

Answer 4

I had an ES6 Map in my data, which gets stringified to empty by default. I had to refer to below answer to address the issue by manually adding a replacer function to the JSON.Stringify

How do you JSON.stringify an ES6 Map?