Read a Simple JSON array

Question

I'm trying to send a simple array but it's not working. I just want to send all the array at the same time and read containerName and containerStatus.

My first console.log outputs this.

{"containerName":"123","containerStatus":"Up 2 hours"}{"containerName":"ingesdev","containerStatus":"Up 2 hours"}

Java

 List<Container> runningContainers = dockerClient.listContainersCmd()
                        .exec();

                JSONObject jsonContainer = new JSONObject();

                for (Container container:runningContainers) {
                    jsonContainer.put("containerName", container.getNames()[0].replace("/",""));
                    jsonContainer.put("containerStatus",container.getStatus());
                    response.getWriter().write(jsonContainer.toString());
                }

JavaScript

 $.ajax({
    type: 'post',
    url: 'Containers',
    success: function (result) {
        console.log(result);
        var container = container = JSON.parse(result);
        console.log(container.containerName);

    },
    error: function() {

    }
});

VM362:1 Uncaught SyntaxError: Unexpected token { in JSON at position 54 at JSON.parse () at Object.success (dashboard.js:10) at i (jquery.min.js:2) at Object.fireWith [as resolveWith] (jquery.min.js:2) at A (jquery.min.js:4) at XMLHttpRequest. (jquery.min.js:4)

You are not returning valid JSON to the client. You cannot have multiple consecutive objects at the top level. You should have an array at the top level that contains the objects. Or return only a single object. — Felix Kling
I wanted to return all the objects in the same time but they are overwrriting when i use .put so I can only see the last one. — asdasd

Felix Kling Felix Kling · Accepted Answer · 2017-10-31T17:34:31

You are not returning valid JSON to the client. You cannot have multiple consecutive objects at the top level. You should have an array at the top level that contains the objects.

Server side:

JSONArray jsonArray = new JSONAarray();

for (Container container:runningContainers) {
  JSONObject obj = new JSONObject();
  obj.put("containerName", container.getNames()[0].replace("/",""));
  obj.put("containerStatus",container.getStatus());
  jsonArray.put(obj);
}
response.getWriter().write(jsonArray.toString());

Client side:

$.ajax({
    type: 'post',
    url: 'Containers',
    success: function (result) {
      JSON.parse(result).forEach(function(container) {
        console.log(container.containerName);
      });
    },
    error: function() {

    }
});

Read a Simple JSON array

2 Answers