How to create JSON object Node.js [closed]

Question

I am trying to create a JSON object in Node.js without any success. For example an object like this:

{ 'Orientation Sensor':     [ { sampleTime: '1450632410296',        data: '76.36731:3.4651554:0.5665419' },      { sampleTime: '1450632410296',        data: '78.15431:0.5247617:-0.20050584' } ],   'Screen Orientation Sensor':     [ { sampleTime: '1450632410296',        data: '255.0:-1.0:0.0' } ],   'MPU6500 Gyroscope sensor UnCalibrated':     [ { sampleTime: '1450632410296',        data: '-0.05006743:-0.013848438:-0.0063915867},      { sampleTime: '1450632410296',        data: '-0.051132694:-0.0127831735:-0.003325345'}]} 

but in a dynamic way without any knowledge about the size of every item. Is there something like that in Node.js?

Answer 1

What I believe you're looking for is a way to work with arrays as object values:

var o = {} // empty Object var key = 'Orientation Sensor'; o[key] = []; // empty Array, which you can push() values into   var data = {     sampleTime: '1450632410296',     data: '76.36731:3.4651554:0.5665419' }; var data2 = {     sampleTime: '1450632410296',     data: '78.15431:0.5247617:-0.20050584' }; o[key].push(data); o[key].push(data2); 

This is standard JavaScript and not something NodeJS specific. In order to serialize it to a JSON string you can use the native JSON.stringify:

JSON.stringify(o); //> '{"Orientation Sensor":[{"sampleTime":"1450632410296","data":"76.36731:3.4651554:0.5665419"},{"sampleTime":"1450632410296","data":"78.15431:0.5247617:-0.20050584"}]}'