Cannot get Value from JSON

Question

I'm having trouble getting a specific value from a JSON object.

My program queries wolframalpha which returns an object "result" using the following code:

var wolfram = require('wolfram').createClient("[CENSORED]")

wolfram.query("integrate 2x", function(err, result) {
  if(err) throw err
  console.log("Result: %j", result)
})

It returns the following JSON:

[
  {
    "subpods": 
      [{
      "title":"",
      "value":" integral 2 x dx = x^2+constant",
      "image":"http://www5a.wolframalpha.com/Calculate/MSP/MSP36002050fgg595dgib5a000031a456025754352g?MSPStoreType=image/gif&s=59"
      }],
    "primary":true
  },
  {
      "subpods": [{
      "title":"",
      "value":"",
      "image":"http://www5a.wolframalpha.com/Calculate/MSP/MSP36012050fgg595dgib5a000055e24iecig9cc4ga?MSPStoreType=image/gif&s=59"
    }],
    "primary":false
  }
]

I'm trying to get "value" from the first subpod. I tried: var newResults = result.subpods[0].value;

but this gave me an error: TypeError: Cannot read property '0' of undefined

I've been trying different combinations for at least the last hour. Please help!

Thank you for your time,

Bobbyg

You need to parse the json to turn it into an object: http://stackoverflow.com/questions/5726729/how-to-parse-json-using-nodejs — Jack, Nov 14 '13 at 17:20

score 9 · Accepted Answer · edited Nov 14 '13 at 17:22

9

result looks like an array.

Try:

var newResults = result[0].subpods[0].value;

edited Nov 14 '13 at 17:22

tymeJV

103,943
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answered Nov 14 '13 at 17:21

Michael J. Anderson

479
2
6

score 4 · Answer 2 · answered Nov 14 '13 at 17:23

4

Try the following code..

var newResults = result[0].subpods[0].value;

answered Nov 14 '13 at 17:23

Hasib Tarafder

5,773
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Cannot get Value from JSON

2 Answers2