Get a JSON Object from a Http Response

Get a JSON object from a HTTP response

The string that you get is just the JSON Object.toString(). It means that you get the JSON object, but in a String format.

If you are supposed to get a JSON Object you can just put:

JSONObject myObject = new JSONObject(result);

how to get JSON value from HTTP response?

You can convert JSON string into JSONObject and then get then token using getString() method

JSONObject result = new JSONObject(EntityUtils.toString(entity));
String token = result.getString("token"); 

How do I get a JSON object from an Http Response?

As your image shows you are getting the response on console, try accessing it as follows,

.subscribe(response=>{    
    console.log(response['access_token']);
  })

get json from HttpResponse

I think the problem you are running into is one similar to my own I just ran into. If you run:

String json_string = EntityUtils.toString(response.getEntity());
JSONObject temp1 = new JSONObject(json_string);

The above code will throw an exception and it looks like the JSON array brackets are to blame. But it's fine to have a JSON array as the top level element! You just need to use JSONArray() instead of JSONObject:

String json_string = EntityUtils.toString(response.getEntity());
JSONArray temp1 = new JSONArray(json_string);

So you have to know if you are getting a JSONArray or a single dictionary that is a JSONObject in your JSON code.

If you are used to the iOS/Objective-C JSON parsing libraries they use the same top level element to deal with json dictionaries and json array's, so moving to the JAVA / Android world confused me about having two types for handling JSON depending on the top level returned.

Parsing a JSON from HTTP Response in Java

Better and easier to use Gson

Gson gson = new Gson;
NameBean name = gson.fromJson(content.toString(),NameBean.class)

NameBean is the object where you persist the json string.

public class NameBean implements Serializable{
public String name;
public String lastname;
public Int age;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getLastname() {
    return lastname;
}

public void setLastname(String lastname) {
    this.lastname = lastname;
}

public Int getAge() {
    return age;
}

public void setAge(Int age) {
    this.age = age;
}

}

How to map HttpResponse in a Object Java

Another commonly used library for this is Jackson ObjectMapper. Using ObjectMapper, you can map the body to an object like this:

String json = response.body(); // "{ \"name\" : \"Nemo\", \"type\" : \"Fish\" }";
Animal nemo = objectMapper.readValue(json, Animal.class);

For a step by step guide, see https://www.baeldung.com/jackson-object-mapper-tutorial#2-json-to-java-object

Is there a way to extract JSON from an http response without having to build structs?

Golang: fetch JSON from an HTTP response without using structs as helpers

This is a typical scenario we come across. This is achieved by json.Unmarshal.

Here is a simple json

{"textfield":"I'm a text.","num":1234,"list":[1,2,3]}

which is serialized to send across the network and unmarshaled at Golang end.

package main

import (
    "fmt"
    "encoding/json"
)

func main() {
    // replace this by fetching actual response body
    responseBody := `{"textfield":"I'm a text.","num":1234,"list":[1,2,3]}`
    var data map[string]interface{}
    err := json.Unmarshal([]byte(responseBody), &data)
    if err != nil {
        panic(err)
    }
    fmt.Println(data["list"])
    fmt.Println(data["textfield"])
}

Hope this was helpful.

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