I was using s3 select to fetch selective data and display them on my front end .
I converted array of byte to buffer and then to string like below as string
let dataString = Buffer.concat(records).toString('utf8');
the result i got was string like below
{"id":"1","obj1":"191.25","obj2":"11.81","obj3":"3.44","obj4":"15.62"}
{"id":"2","obj1":"642.00","obj2":"4.33","obj3":"0.00","obj4":"11.33"}
{"id":"3","obj1":"153.76","obj2":"94.77","obj3":"16.80","obj4":"29.79"}
{"id":"4","obj1":"61.71","obj2":"0.43","obj3":"0.00","obj4":"8.14"}
{"id":"5","obj1":"194.33","obj2":"108.89","obj3":"14.13","obj4":"168.60"}
{"id":"6","obj1":"204.31","obj2":"137.41","obj3":"34.76","obj4":"193.16"}
{"id":"7","obj1":"199.53","obj2":"34.53","obj3":"16.29","obj4":"26.56"}
{"id":"8","obj1":"77.33","obj2":"5.00","obj3":"12.50","obj4":"0.00"}
{"id":"9","obj1":"128.54","obj2":"101.60","obj3":"15.76","obj4":"46.23"}
{"id":"10","obj1":"107.00","obj2":"116.67","obj3":"34.42","obj4":"8.75"}
{"id":"12","obj1":"206.05","obj2":"155.03","obj3":"36.96","obj4":"148.99"}
{"id":"13","obj1":"133.93","obj2":"142.79","obj3":"39.91","obj4":"98.30"}
Now i want to convert them to json array , i got a solution like below
let dataArray = dataString.split('\n');
//remove white spaces and commas etc
dataArray = dataArray.filter(d=> d.length >2);
//change string to json
dataArray = dataArray.map(d=> JSON.parse(d));
Now the problem is that i have splitted them with new line and wont work if the json is compressed or data itself can have new line.
What is the best way to handle this situation. i want the output like below
[{"id":"1","obj1":"191.25","obj2":"11.81","obj3":"3.44","obj4":"15.62"},
{"id":"2","obj1":"642.00","obj2":"4.33","obj3":"0.00","obj4":"11.33"},
{"id":"3","obj1":"153.76","obj2":"94.77","obj3":"16.80","obj4":"29.79"},
{"id":"4","obj1":"61.71","obj2":"0.43","obj3":"0.00","obj4":"8.14"},
{"id":"5","obj1":"194.33","obj2":"108.89","obj3":"14.13","obj4":"168.60"},
{"id":"6","obj1":"204.31","obj2":"137.41","obj3":"34.76","obj4":"193.16"},
{"id":"7","obj1":"199.53","obj2":"34.53","obj3":"16.29","obj4":"26.56"},
{"id":"8","obj1":"77.33","obj2":"5.00","obj3":"12.50","obj4":"0.00"},
{"id":"9","obj1":"128.54","obj2":"101.60","obj3":"15.76","obj4":"46.23"},
{"id":"10","obj1":"107.00","obj2":"116.67","obj3":"34.42","obj4":"8.75"},
{"id":"12","obj1":"206.05","obj2":"155.03","obj3":"36.96","obj4":"148.99"},
{"id":"13","obj1":"133.93","obj2":"142.79","obj3":"39.91","obj4":"98.30"}
]
#sumit
please take a look at this solution.
let dataString=`{"id":"1","obj1":"191.25","obj2":"11.81","obj3":"3.44","obj4":"15.62"}
{"id":"2","obj1":"642.00","obj2":"4.33","obj3":"0.00","obj4":"11.33"}
{"id":"3","obj1":"153.76","obj2":"94.77","obj3":"16.80","obj4":"29.79"}
{"id":"4","obj1":"61.71","obj2":"0.43","obj3":"0.00","obj4":"8.14"}
{"id":"5","obj1":"194.33","obj2":"108.89","obj3":"14.13","obj4":"168.60"}
{"id":"6","obj1":"204.31","obj2":"137.41","obj3":"34.76","obj4":"193.16"}
{"id":"7","obj1":"199.53","obj2":"34.53","obj3":"16.29","obj4":"26.56"}
{"id":"8","obj1":"77.33","obj2":"5.00","obj3":"12.50","obj4":"0.00"}
{"id":"9","obj1":"128.54","obj2":"101.60","obj3":"15.76","obj4":"46.23"}
{"id":"10","obj1":"107.00","obj2":"116.67","obj3":"34.42","obj4":"8.75"}
{"id":"12","obj1":"206.05","obj2":"155.03","obj3":"36.96","obj4":"148.99"}
{"id":"13","obj1":"133.93","obj2":"142.79","obj3":"39.91","obj4":"98.30"}`;
let dataArray = dataString.match(/{(?:[^{}]*|(R))*}/g);
dataArray = dataArray.map(d=> JSON.parse(d));
console.log(dataArray);
Yeah, it is not a very good idea to concatenate objects into a string like that. If you don't have any other choice, however, something like that should do the trick:
const initialString = `{"id":"1","obj1":"191.25","obj2":"11.81","obj3":"3.44","obj4":"15.62"}
{"id":"2","obj1":"642.00","obj2":"4.33","obj3":"0.00","obj4":"11.33"}
{"id":"3","obj1":"153.76","obj2":"94.77","obj3":"16.80","obj4":"29.79"}
{"id":"4","obj1":"61.71","obj2":"0.43","obj3":"0.00","obj4":"8.14"}
{"id":"5","obj1":"194.33","obj2":"108.89","obj3":"14.13","obj4":"168.60"}
{"id":"6","obj1":"204.31","obj2":"137.41","obj3":"34.76","obj4":"193.16"}
{"id":"7","obj1":"199.53","obj2":"34.53","obj3":"16.29","obj4":"26.56"}
{"id":"8","obj1":"77.33","obj2":"5.00","obj3":"12.50","obj4":"0.00"}
{"id":"9","obj1":"128.54","obj2":"101.60","obj3":"15.76","obj4":"46.23"}
{"id":"10","obj1":"107.00","obj2":"116.67","obj3":"34.42","obj4":"8.75"}
{"id":"12","obj1":"206.05","obj2":"155.03","obj3":"36.96","obj4":"148.99"}
{"id":"13","obj1":"133.93","obj2":"142.79","obj3":"39.91","obj4":"98.30"}`;
const json = `[${initialString.replace(/}\s*{/g, '},{')}]`;
const array = JSON.parse(json);
Beginner javascript learner here, trying to convert an array of strings to an array of dateTimes using just vanilla.
Sample input:
["2018-07-16T14:28:03.123",
"2018-07-20T14:00:27.123",
"2018-07-26T13:31:12.123",
"2018-08-12T13:03:37.123",
"2018-09-24T12:35:46.123"]
Wanted output:
[2018-07-16T14:28:03.123,
2018-07-20T14:00:27.123,
2018-07-26T13:31:12.123,
2018-08-12T13:03:37.123,
2018-09-24T12:35:46.123]
My string values are always dateTime string representations, so I've been trying to leverage new Date(stringDateTime) to convert each string to it's dateTime counterpart, but I'm running into trouble on how to navigate the array and build a new one with the appropriate dateTime data types.
Use the map function:
var datesStr = ["2018-07-16T14:28:03.123", "2018-07-20T14:00:27.123", "2018-07-26T13:31:12.123", "2018-08-12T13:03:37.123", "2018-09-24T12:35:46.123"]
var dates = datesStr.map(d => new Date(d));
While Igal's answer is more elegant and concise, I would try to show a more basic solution where you use a for loop and new Date():
var stringDates = ["2018-07-16T14:28:03.123",
"2018-07-20T14:00:27.123",
"2018-07-26T13:31:12.123",
"2018-08-12T13:03:37.123",
"2018-09-24T12:35:46.123"];
var dateObjects = [];
//Loop over your string array and push dates in your dateObjects array
for (var index in stringDates) {
var stringDate = stringDates[index];
dateObjects.push(new Date(stringDate));
}
JSON:
[{"CDATE":"0000-00-00","DISTANCE":"0"},
{"CDATE":"0000-00-00","DISTANCE":"1"},
{"CDATE":"0000-00-00","DISTANCE":"2"},
{"CDATE":"0000-00-00","DISTANCE":"3"}]
Is it possible to put all the distance value in their own array in JS? The formatting will be consistent as it comes from an API and is always formatted correctly.
What I've tried:
var arry = [ /* JSON noted above */ ];
alert(arry[1])
and
var arry = JSON.parse([ /* JSON noted above */ ]);
alert(arry[1])
Expected:
1
Actual:
{"CDATE":"0000-00-00","DISTANCE":"1"}
and the other gives an error.
I would like to extract just the DISTANCE value as an array of DISTANCE
I've tried JSON.parse() but I don't think this is what I am after as it hasn't worked for me.
Use .map
var data = [{"CDATE":"0000-00-00","DISTANCE":"0"},
{"CDATE":"0000-00-00","DISTANCE":"1"},
{"CDATE":"0000-00-00","DISTANCE":"2"},
{"CDATE":"0000-00-00","DISTANCE":"3"}];
var distance = data.map(el => el.DISTANCE);
console.log(distance[2]);
console.log(distance);
It is already a valid json so you do not need to use JSON.parse()
I feel like this should be simple but I can't get my head around it. I'm trying to use Google Charts to display some simple data, I've got this data in a json string in a format like.
var json1 = [{"email":"abc#xyz","noOfOrders":"223"},{"email":"bcd#xyz.com","noOfOrders":"12"},{"email":"cde#xyz.com","noOfOrders":"132"}]
and I'm trying to get that into Google charts which has to be formatted as such.
var data = google.visualization.arrayToDataTable([
['Customer', 'Number of Orders'],
['abc#xyz.com', 223],
['bcd#xyz.com', 12],
['cde#xyz.com', 123]
]);
I'm trying to achieve with this javascript.
You could iterate through the JSON data and build the array needed for the chart.
var json = JSON.parse( [{...}] ); //parse the json string first, converting it to an array
var opts = [['Customer', 'Number of Orders']]; //add the headers now
for (var i = 0; i < json.length; i++) {
opts[] = [ json[i].email, json[i].noOfOrders ];
}
var data = google.visualization.arrayToDataTable( data );
I have a json arry
var students = {"apResults":[{"offid":"267","item_name":"","offer_name":"fsdfsf","stlongitude":"77.5945627","stlatitude":"12.9715987"},
{"offid":"265","item_name":"","offer_name":"vess offer shops","stlongitude":"","stlatitude":""},
{"offid":"264","item_name":"","offer_name":"vess ofer shop","stlongitude":"","stlatitude":""},
{"offid":"263","item_name":"","offer_name":"ofer frm vess","stlongitude":"77.5943760","stlatitude":"12.9716060"},
{"offid":"262","item_name":"","offer_name":"offer hungamma","stlongitude":"77.5943760","stlatitude":"12.9716060"},
{"offid":"261","item_name":"","offer_name":"offer hungamma","stlongitude":"77.5943760","stlatitude":"12.9716060"},
{"offid":"260","item_name":"","offer_name":"offer1","stlongitude":"77.5943760","stlatitude":"12.9716060"},
{"offid":"259","item_name":"","offer_name":"offer","stlongitude":"77.5943760","stlatitude":"12.9716060"}]}
How i can parse this json arry using json.parse. I have tried this code
for(i=0;i<students.apResults.length;i++)
{
var contact = JSON.parse(students.apResults);
var offid = contact.offid;
alert(offid)
}
But its giving an error JSON.parse: unexpected character.Edited my question
That's not a json string, that's a regular javascript variable:
for(i=0;i<students.Maths.length;i++)
{
var contact = students.Maths[i];
var fullname = contact.Name;
alert(fullname)
}
for(i=0;i<students.apResults.length;i++)
{
var contact = JSON.parse(students.apResults[i].offid);
alert(contact)
}
JSON parses strings, not objects/arrays.
why need parsing when you can access it like students.Maths[i].Name
students is not a JSON array, it's an actual array. You don't have to parse because it's not a string. So you can access directly to the data you need:
for(i=0;i<students.Maths.length;i++) {
var contact = students.Maths[i];
var fullname = contact.Name;
alert(fullname)
}
You can't parse students because is not a JSON. It's simple object.
However this will work:
var students = JSON.stringify(students); // if you want to send data
students = JSON.parse(students); // after receiving make a object from it
//use like any object
for(i=0;i<students.Maths.length;i++)
{
var contact = students.Maths[i];
var fullname = contact.Name;
alert(fullname)
}
Of course it doesn't make sense to write it that way unless you send students data to other site or program.
Edit:
You don't need JSON in this code at all. But if you want to test JSON.parse() do it this way:
var students = { ... } // your data
var students = JSON.stringify(students); // students is `object`, make it `string`
students = JSON.parse(students); // now you can parse it, `students` is object again
for(i=0;i<students.apResults.length;i++) {
var contact = students.apResults; // no JSON
var offid = contact.offid;
alert(offid)
}
That should work.
What you have is a javascript object. So, you won't need the JSON.parse
for(i=0;i<students.Maths.length;i++)
{
var contact = students.Maths[i]);
var fullname = contact.Name;
alert(fullname)
}
this should be ok
The idea of JSON is for the exchange of objects represented as a structured string (in a nutshell). What you've got there is simply an object. It's unnecessary (and impossible) to parse and object that isn't JSON into a javascript object; what you have is the outcome of what you would expect from a parsed JSON string.