This question already has answers here:
How can I access and process nested objects, arrays, or JSON?
(31 answers)
Closed 9 months ago.
So i want to get a value from a json file, but for the life of it, i cant get to understand what to write.
So if someone could help me write this line of code in javascript node, i would be grateful.
I am trying to get the value of "totalCount"
This is from a library called GeoDb just for context.
main.js(NODEjs)
const timezone = require("./TimezonePortugal.json"); //referencing the json
console.log(timezone.metadata); // i dont know what to say afther this
TimezonePortugal.json
{"data":[{"code":"EUR","countryCodes":["PT","YT","IE","AD","IT","AT","RE","AX","BE","BL","SI","SK","SM","CY","DE","LT","LU","LV","MC","ME","MF","EE","MQ","MT","VA","ES","NL","FI","FR","GF","GP","GR","PM"],"symbol":"€"}],"metadata":{"currentOffset":0,"totalCount":1}}
"." means inside.
If you want to get value of totalCount you have to think like this:
timezone.metadata.totalCount = totalCount inside the metada, metadata inside the timezone
For example:
var timezone=
{
"data":[
{
"code":"EUR",
"countryCodes": ["PT","YT",],
"symbol":"€"
}
],
"metadata": {
"currentOffset":0,
"totalCount":1
}
}
Related
This question already has answers here:
How can I access and process nested objects, arrays, or JSON?
(31 answers)
Closed 6 years ago.
I am trying to read from a JSON array with a nested array which has its value name spaced out. So I get an error whenever I run the code.
var error = [
{
"LessonName":"Understanding Multiplication",
"LessonID":"13343",
"no of questions":[{"Locked":"31","Unlocked":5}]
},
{
"LessonName":"Finding Unknown Values ",
"LessonID":"13424",
"no of questions":[{"Locked":"34","Unlocked":5}]
}
]
function jsd(){
document.write(error[0].LessonName);
document.write(error[0].'no of questions'[0].Locked);
}
document.write(error[0]."no of questions"[0].Locked); Doesn't seem to display.
You may use a property accessor with brackets for the string.
error[0]['no of questions'][0].Locked
You must use this syntax for strings with spaces.
document.write(error[0]['no of questions'][0].Locked);
This question already has answers here:
How can I add a key/value pair to a JavaScript object?
(26 answers)
Closed 7 years ago.
//filejson.json
{
"body":
{
"name":"abc"
}
}
//mainFile.js
var readJson = require("/filejson.json")
var req=clone(readJson.body);
I want to change the name of JSON value without changing .json file. I need to set name value using rewire module. Can you help me how to set key value pair dynamically. Is it possible to set like this. Please help me Thanks in advance.
var readJson = require("/filejson.json")
readJson.name = "defg";
Require just use the file, no changes will occur to the file.
This question already has answers here:
How can I access and process nested objects, arrays, or JSON?
(31 answers)
Closed 8 years ago.
Hi friends I have a I have a json string as shown below. How to parse the string to get day,min_amount,max_amount values .
[{"day":"1970-01-01","min_amount":"0.00","max_amount":"0.00"},{"day":"1970-01-02","min_amount":"1.00","max_amount":"2.00"}]
Just use JSON.parse. The syntax for accessing a value is simple:
obj = JSON.parse(json)
day = obj[0].day
min_amount = obj[0].day
max_amount = obj[0].day
The great thing about Javascript is how simple it is to use JSON, because JSON is just a serialized version of plain-old javascript hashes, arrays, and scalars.
It's already in object form. SO use this :
var x = [{"day":"1970-01-01","min_amount":"0.00","max_amount":"0.00"},{"day":"1970-01-02","min_amount":"1.00","max_amount":"2.00"}]
jQuery.each(x,function(e){
console.log(x[e])
console.log(x[e].day)
});
Here is the working example : http://jsfiddle.net/u6J8A/
As you may not have noticed, JSON is JavaScript synthax.
<script type="text/javascript">
var data = [
{"day":"1970-01-01","min_amount":"0.00","max_amount":"0.00"},
{"day":"1970-01-02","min_amount":"1.00","max_amount":"2.00"}
];
</script>
Dumping it directly in the JavaScript code is perfectly valid.
But if you are fetching this data at run time and have the information as a string, you can convert it using JSON.parse(string).
The information can be then read from this structure by the variables data[0].day, data[0].min_amount, data[0].max_amount, data[1].day, data[1].min_amount, data[1].max_amount.
This question already has answers here:
How can I access and process nested objects, arrays, or JSON?
(31 answers)
Closed 9 years ago.
I have this json array
var currencyformats =
{"USD":[
{'symbol':'$', 'left':true}
],
"UAH":[
{'symbol':'₴', 'left':true}
],
"EUR":[
{'symbol':'€', 'left':false}
]
};
How retreive '₴' ?
I tried this (in cookie "to" I've "UAH")
currencyformats[$.cookie("to")].symbol
but I've obtained undefined
The problem is that under each country code, you've defined an array with a single object. That means that after you access the country code, you'll need to also access the first index in the array.
So, assuming the cookie is set to the value that you're expecting:
currencyformats[$.cookie("to")][0].symbol;
This question already has answers here:
Javascript get object key name
(8 answers)
Closed 5 years ago.
I'm using the flat-cache NPM package and I'm currently blocked because I can't recover the key from the data I'm caching. It must be very simple, but I'm starting with the JS and I'm pulling my hair out on this problem.
Simple example of code :
main.js
var flatCache = require('flat-cache')
flatCache.setKey('d86f003c-bf0a-4b08-9744-1081c78ece9d', {"creation":"2018/02/20", "link":"https://www.npmjs.com/package/uuid","comment":"UUID", "tags":["NPM", "UUID"]});
var a = flatCache.all();
console.log(a);
Example of data from console :
{
"d86f003c-bf0a-4b08-9744-1081c78ece9d": {
"date":"20180220",
"comment":"Hello world",
"tags":[
"hello",
"worlds"
]
}
}
What would be the procedure to follow to retrieve the key : d86f003c-bf0a-4b08-9744-1081c78ece9d ?
Thank you in advance for your answer !
Use Object.keys method.
In your case:
// `a` is defined somewhere there
...
Object.keys(a); // an array of object keys - but only the first level
console.log(Object.keys(a)[0]); // should log `d86f003c-bf0a-4b08-9744-1081c78ece9d`
for further reference - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys