convert JSON array to Ruby Hash (of hashes)

Question

I'm trying to convert some API response data into a Ruby hash or array so I can more easily work with it. Here's the JSON string being returned by the API:

[
  {
    "id": 2,
    "name": "TestThing",
    "token": "B2CA27221DB976E48248F26756289B91"
  },
  {
    "id": 3,
    "name": "AnotherTestThing",
    "token": "EF16E5F20B8463E48DBF3BA8F0E1102A"
  }
]

I believe that is a JSON array? I tried doing JSON.parse on that string, but got (JSON::ParserError)r/.rvm/rubies/ruby-1.9.3-p551/lib/ruby/1.9.1/json/common.rb:148:in 'parse': 746: unexpected token at '1511

What is the best way to convert this into something I can easily work with? My real goal here is to iterate over the tokens returned.

What specifically are you showing us? What you've shown is an actual array of hashes. — Dave Newton
– Dave Newton, Commented Jun 15, 2015 at 16:09
JSON.parse is usually the way to do it. What is at position 1511 in your input? — Nic Nilov
– Nic Nilov, Commented Jun 15, 2015 at 16:13
what I'm showing you is a string. It looks like an array of hashes, and I think that's what i would like it to be. — Ben Walker
– Ben Walker, Commented Jun 15, 2015 at 16:13
I think I must have some extra whitespace or something in my JSON. I manually trimmed it down and tried the JSON.parse and it works. — Ben Walker
– Ben Walker, Commented Jun 15, 2015 at 16:17
Strings have quotes around them, that's what I'm saying--it's not clear what you actually have. If I put quotes around this (and escape the double-quotes) JSON.parse works just fine. — Dave Newton
– Dave Newton, Commented Jun 15, 2015 at 16:20

Amit Suroliya · Accepted Answer · 2015-06-15 16:22:57Z

3

require 'json'
array = '[
  {
    "id": 2,
    "name": "TestThing",
    "token": "B2CA27221DB976E48248F26756289B91"
  },
  {
    "id": 3,
    "name": "AnotherTestThing",
    "token": "EF16E5F20B8463E48DBF3BA8F0E1102A"
  }
]'

JSON.parse(array)

edited Jun 15, 2015 at 16:22

answered Jun 15, 2015 at 16:14

Amit Suroliya

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4 Comments

Nic Nilov Over a year ago

You might want to run this code to see an error. What's the point of supplying a non-string object to JSON.parse?

Amit Suroliya Over a year ago

Yes, we need to parse it JSON.parse(array.to_s)

Dave Newton Over a year ago

@AmitSuroliya But he's saying he already has a string; you're taking a Ruby array of hashes, turning it into a string, then turning it back into a Ruby array of hashes.

Nic Nilov Over a year ago

You might also want to run JSON.parse(array.to_s) to see another error.

Ben Walker · Accepted Answer · 2015-06-15 16:24:28Z

0

My question did not show the full string I was trying to JSON.parse. I only put what I was trying to parse. I accidentally left some floating data before the JSON part of my string. Now that I have deleted that, it is working.

answered Jun 15, 2015 at 16:24

Ben Walker

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