use a value in the variable as key to access json in node js

Question

JSON data : {

"8500500561":{
         "food":"400",
         "cloth":"44",
         "travel":"44"
         }

}

I'll get the key value to access the JSON data dynamically

Node.js file :

 const fs  = requrie('fs');
 let rawdata = fs.readFileSync('data.json');
 let mydata = JSON.parse(rawdata);
 mob = '8500500561';
 console.log(mydata.mob.food);

but when I use this I'm getting an error : TypeError: Cannot read property 'food' of undefined

By writing mydata.mob you are looking for the key mob in the object mydata. What you should be doing is mydata[mob]. — Azami
– Azami, Commented Jan 16, 2019 at 17:19
Possible duplicate of Dynamically access object property using variable — user400654
– user400654, Commented Jan 16, 2019 at 19:05

DublinDev · Accepted Answer · 2019-01-16 17:34:46Z

1

MadWard is correct in his comment. You would to structure it like this. You do have some typos in your example you are probably aware of but just pointing them out in case.

const fs  = requrie('fs'); //should be require
let rawdata = fs.readFileSync('data.json');
let mydata = JSON.parse(rawdata);
mob = '8500500561'; //850050051 in dataFile
console.log(mydata[mob].food);

answered Jan 16, 2019 at 17:34

DublinDev

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