node,js add an outer level to json using a variable as key name

Question

I have a standard JSON stored in a variable and am able to add a top level key when directly using text but a variable,

[{"myKey":"my value"}]

is stored in orginalJson. I then add a top level key as text

var newJson = JSON.parse(orginalJson);
newJson = { myText: newJson };

gives

{ "myText": [{"myKey":"my value"}]}

I would now like to replace the text in the code with a variable

var newVar = "newtext";    
var newJson = JSON.parse(orginalJson);
newJson = { newVar: newJson };

however I do not get the var value as expected, just the name of var not the value

expecting

{ "newtext": [{"myKey":"my value"}]}

but get

{ "newVar ": [{"myKey":"my value"}]}

what is the correct way to use a var in this instance. I have read other posts suggesting using a push but I have not had any luck understanding the correct syntax.

Japheth Obala · Accepted Answer · 2017-07-26 23:26:52Z

1

The correct way of using var is;

var newVar = "newText"
var newJson = {}
newJson[newVar] = JSON.parse(originalJson)

This will give you

{ "newVar ": [{"myKey":"my value"}]}

answered Jul 26, 2017 at 23:26

Japheth Obala

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Comments

adeneo · Accepted Answer · 2017-07-26 23:18:41Z

0

You have to first create the object, then use bracket notation for the key
Because you're using the same variable to hold the newly modified value, we'll need a temporary object.
The better option would probably be to not use the same variabel twice

var orginalJson = '{"test":"test"}';

var newVar = "newtext";
var newJson = JSON.parse(orginalJson);
var tempObj = {};

tempObj[newVar] = newJson;

newJson = tempObj;

console.log(newJson)

Or in ES2015 you can use dynamic keys

var orginalJson = '{"test":"test"}';

var newVar = "newtext";
var newJson = JSON.parse(orginalJson);

newJson = { [newVar]: newJson };

console.log(newJson);

answered Jul 26, 2017 at 23:18

adeneo

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1 Comment

art vanderlay Over a year ago

thanks for the code. This answer does work and explains the process. thanks

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