Javascript Append JSON Objects

Question

How can I append a JSON like structure while iterating through a for loop?

For Example (Pseudo Code):

var i; for (i = 0; i < clients.length; i++) { date = clients.date; contact = clients.contact; }

My main goal is to append as many groups of: dates and contacts as the clients.length data holds.

I need each loop iteration to create something like below of multiple indexes of date and contact groups. My overall goal is to have a data structure like below created through my for loop.

Assume im just using strings for: "Date" & "Contact"

 var data = [ { "Date": "2015-02-03", "Contact": 1 }, { "Date": "2017-01-22", "Contact": 2 } ];

developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Max Baldwin, CommentedAug 2, 2018 at 1:02
why not just create an array of objects then use JSON.stringify - the problem with your pseudo code is that it doesn't explain a thing — Jaromanda X, CommentedAug 2, 2018 at 1:04
thats a great idea but how can i append each stringify value in an array. That would give me the same structure as the data var? — nil, CommentedAug 2, 2018 at 1:07
you don't ... you create an array of objects, then stringify it once you're done - clearly you have an existing object, something like: clients = [ { date:'2015-02-03', contact: 1 },{ date:'2017-01-22', contact: 2 } ]; so siimply result = JSON.stringify(clients.map(({date, contact}) => ({Date:date, Contact:contact}))) — Jaromanda X, CommentedAug 2, 2018 at 1:08

clucle · Accepted Answer · 2018-08-02 01:12:54Z

var data = [] function Client(date, contact) { this.date = date this.contact = contact } clients = new Array(); for (i = 0; i < 4; i++) { clients.push(new Client("2018-08-0" + i, i)) } for (i = 0; i < clients.length; i++) { var dict = {} dict['Date'] = clients[i].date dict['Contact'] = clients[i].contact data[i] = dict } console.log(data)

Exactly what I was looking for.
– nil
CommentedAug 2, 2018 at 1:19 — nil, CommentedAug 2, 2018 at 1:19

Liang · Accepted Answer · 2018-08-02 01:18:10Z

It's a simple push object to array operation. Please try below

var data=[]; var i; for (i = 0; i < clients.length; i++) { data.push({ date:clients.date, contact:clients.contact }); }

Wiliam Carvalho · Accepted Answer · 2018-08-02 18:17:16Z

(ES6) You can use map function to extract the data you wish, and then convert it to json.

let clients = [{date:"", contact:"", otherstuff:""}, {date:"", contact:"", otherstuff:""}] let clientsMapped = clients.map(client => ({Date:client.date, Contact:client.contact})) let yourJson = JSON.stringify(clientsMapped)

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