I'm using Volley library to communicate with my API. I'm pretty new to Android and Kotlin and I'm really confused about extracting keys from the following JSON data
{
"message": {
"_id": "60bc7fa7abeedb25643fa692",
"hash": "3a54b415461a63abac1fc6dfa0e140584047bd15358e33a177f9505ed2faa4d4",
"blockchain": "ethereum",
"amount": 5000,
"amount_usd": 13352971,
"from": "d3d69228cb2292f933572399593617f574c70eb1",
"to": "fe9996da73d6bf5252f15024811954ae37ab68be",
"__v": 0
}
}
The volley library returns all of this JSON data in a variable called response and I'm using response.getString("message") to extract the message key but, I don't understand how to extract the internal data such as hash, blockchain, amount, etc.
I'm using the following code to get the JSON data from my backend.
val jsonRequest = JsonObjectRequest(
Request.Method.GET, url, null,
{ response ->
tweet_text.setText(response.getString("message"))
Log.d("resp", response.toString())
},
{
Log.d("err", it.localizedMessage)
})
Any help would be appreciated, Thanks!
I found it, I just used the getJSONObject() method to make it work
val jsonRequest = JsonObjectRequest(
Request.Method.GET, url, null,
{ response ->
val txn = response.getJSONObject("message")
//txn object can be used to extract the internal data
},
{
Log.d("err", it.localizedMessage)
})
Related
Using my Scala HTTP Client I retrieved a response in JSON format from an API GET call.
My end goal is to write this JSON content to an AWS S3 bucket in order to make it available as a table on RedShift running a simple AWS Glue crawler.
My thinking is to parse this JSON message and somehow converting into a Spark DataFrame, so later on I can save it to my preferred S3 location in the format of .csv, .parquet, or whatever.
The JSON file looks like this
{
"response": {
"status": "OK",
"start_element": 0,
"num_elements": 100,
"categories": [
{
"id": 1,
"name": "Airlines",
"is_sensitive": false,
"last_modified": "2010-03-19 17:48:36",
"requires_whitelist_on_external": false,
"requires_whitelist_on_managed": false,
"is_brand_eligible": true,
"requires_whitelist": false,
"whitelist": {
"geos": [],
"countries_and_brands": []
}
},
{
"id": 2,
"name": "Apparel",
"is_sensitive": false,
"last_modified": "2010-03-19 17:48:36",
"requires_whitelist_on_external": false,
"requires_whitelist_on_managed": false,
"is_brand_eligible": true,
"requires_whitelist": false,
"whitelist": {
"geos": [],
"countries_and_brands": []
}
}
],
"count": 148,
"dbg_info": {
"warnings": [],
"version": "1.18.1621",
"output_term": "categories"
}
}
}
The content I would like to map to a Dataframe is the one contained by the "categories" JSON Array.
I have managed to parse the message using json4s.JsonMethods method parse this way:
val parsedJson = parse(request) \\ "categories"
Obtaining the following:
output: org.json4s.JValue = JArray(List(JObject(List((id,JInt(1)), (name,JString(Airlines)), (is_sensitive,JBool(false)), (last_modified,JString(2010-03-19 17:48:36)), (requires_whitelist_on_external,JBool(false)), (requires_whitelist_on_managed,JBool(false)), (is_brand_eligible,JBool(true)), (requires_whitelist,JBool(false)), (whitelist,JObject(List((geos,JArray(List())), (countries_and_brands,JArray(List()))))))), JObject(List((id,JInt(2)), (name,JString(Apparel)), (is_sensitive,JBool(false)), (last_modified,JString(2010-03-19 17:48:36)), (requires_whitelist_on_external,JBool(false)), (requires_whitelist_on_managed,JBool(false)), (is_brand_eligible,JBool(true)), (requires_whitelist,JBool(false)), (whitelist,JObject(List((geos,JArray(List())), (countries_and_brands,JArray(List()))))))))
However, I am completely lost on how to proceed. I have even tried using another library for Scala called uJson:
val json = (ujson.read(request))
val tuples = json("response")("categories").arr /* <-- categories is an array */ .map { item =>
(item("id"), item("name"))
This time I have only parsed two fields for testing, but this shouldn't change much. Hence, I obtained the following structure:
tuples: scala.collection.mutable.ArrayBuffer[(ujson.Value, ujson.Value, ujson.Value, ujson.Value)] = ArrayBuffer((1,"Airlines",false,"2010-03-19 17:48:36"), (2,"Apparel",false,"2010-03-19 17:48:36"))
However, also this time I do not know how to move forward and everything I try results in errors, mostly related to format incompatibility.
Please, feel free to propose any other approach to achieve my goal even if it changes totally my workflow. I rather learn something properly. Thanks
We can use the following code to convert JSON to Spark Dataframe/Dataset
val df00 =
spark.read.option("multiline","true").json(Seq(JSON_OUTPUT).toDS())
Using the Spring WebClient I am calling a Rest API that gives me a response as a JSON, following is a structure of the response -
{
"vehicles":[
{ "name":"veh1", "type":"car", "age": 5 },
{ "name":"veh2", "type":"speedboat", "age":12},
.....
]
"metadata": {
"token":"abcd",
"days":120
}
}
I am a newbie to reactive programming, I have written the following code, which works fine ..
Mono<VehicleResponse> = webclient.get()
.uri("/legacy/vehicles")
.accept(MediaType.APPLICATION_JSON)
.retrieve()
.onStatus(HttpStatus::is4xxClientError, clientResponse -> Mono.empty())
.onStatus(HttpStatus::is5xxServerError, clientResponse -> Mono.empty())
.bodyToMono(VehicleResponse.class);
But, actually what I am interested in is, only the vehicles array (don't want the metadata information.) Is it possible to obtain / read only the vehicles (array) as a Flux of Vehicle ?
I'm trying to pull JSON from a Yahoo API to get the conversion rate of USD to SEK. However, I can't seem to get the JSON converted to a Hash, it shows "query" as being the only key since JSON comes in as one string.
The JSON request returns:
{"query":{"count":1,"created":"2016-12-04T13:06:00Z","lang":"en-us","results":{"rate":{"id":"USDSEK","Name":"USD/SEK","Rate":"9.1900","Date":"12/2/2016","Time":"9:59pm","Ask":"9.2000","Bid":"9.1900"}}}}
My code is as follow:
require 'net/http'
require 'json'
url = 'https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22USDSEK%22)&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback='
uri = URI(url)
response = Net::HTTP.get(uri)
json_hash= JSON.parse(response)
puts json_hash["Rate"]
the puts statement returns 'nil'
I've tried following an example from this site, however I do not yield the same results based on the way my data is being brought as his is being statically entered.
*Note I am not using 'ostruct', trying simply with json.
Thank you for any insight.
As you can see, the field you are looking for is into an inner hash. Try
puts json_hash["query"]["results"]["rate"]["Rate"]
Have you check the structure of your json?
{
"query": {
"count": 1,
"created": "2016-12-04T13:06:00Z",
"lang": "en-us",
"results": {
"rate": {
"id": "USDSEK",
"Name": "USD/SEK",
"Rate": "9.1900",
"Date": "12/2/2016",
"Time": "9:59pm",
"Ask": "9.2000",
"Bid": "9.1900"
}
}
}
}
To fetch the rate key you should do something like:
json_hash["query"]["results"]["rate"]
Compare that with json above to understand your problem.
I'm working on a project using Ember/Ember-Data and there is a related/already existing service which is provide API with JSON response.
My project must interact with that service, but the response from that API is someting like below:
{ "id": 39402, "name": "My Name" }
or
[ {"id": 38492, "name": "Other Name" } ]
there is no person: or persons: that is required by Ember-Data compatable response.
How can I using this response on Ember-Data without change on the service or without build API gateway?
Ember-Data uses DS.RestAdapter, which in turn uses DS.RESTSerializer which extends from DS.JSONSerializer for serializing, extracting and massaging data that comes in from the server.
Since in your case you already have the data in your payload, all you need to do for reading the data is override extract method in the JSONSerializer which is actually quite simple.
If you are using ember-cli (which you should :)), your person.js file located inside your app/serializers directory would look as follows.
import DS from 'ember-data';
export default DS.JSONSerializer.extend({
extract: function(store, primaryType, payload) {
return payload;
}
});
If you are not using ember-cli, you can do the following:
App.PersonSerializer = DS.JSONSerializer.extend({
extract: function(store, primaryType, payload) {
return payload;
}
});
Folks,
Designing my first API in Node.JS using restify.js. My background is not webapis, pardon my amateur questions. In any case, I would like to have the res.send(data); responses to comply with the http://jsonapi.org/format/ so that my mobile application can start utilizing the api calls. At the moment if you were to call my api, it would return data in the following format:
{"Count":1,"Items":[{"dbsource":{"S":"foo"},"id":{"S":"5002820"},"name":{"S":"fnameblah,lnameblah"},"expiration":{"S":"06/13/2015"},"type":{"S":"bar"}}]}
Actually what you see above is just a return of a DynamoDB Query call.
So the question is... do you use a special library that you can pass data to, which would format and return the data in JSON format. Which in turn you can return it via res.send(data) to the clients, or is it up to us to make 'data' JSON compliant, then return it? At the end of the day we all want the results to look like:
{
"posts": [{
"id": "1",
"title": "Rails is Omakase",
"links": {
"author": "9",
"comments": [ "5", "12", "17", "20" ]
}
}]
}
Thanks!
In server side, stringify JSON object,
//...
res.statusCode = 200;
res.setHeader('Content-Type', 'application/json');
res.send(JSON.stringify(data)); //data is JSON object
res.end();
In client side, parse JSON string accordingly.
EDIT: Corrected response content type.
JSON data from server should be a JSON string
You have to parse it back the JSON format in client.
JSON.parse(string); // return JSON object