How can I use JSON data with Ruby?

Question

This seems really simple but I've looked all over and I can't find any documentation for this.

I have the following json file:

//data.json
{
  "movie1": [
    {"name": "Inception"}
]}

and I just want to print the value of name with Ruby.

json = File.read('data.json')
data = JSON.parse(json)
data['movie1']['name']

But I'm getting the error

"no implicit conversoin of String into Integer"

How can I print name?

Viewing the result in ruby, e.g. pp data would give you clues as to the issue. — Mark Thomas
– Mark Thomas, Commented Feb 10, 2017 at 23:37

Eric Duminil · Accepted Answer · 2017-02-10 23:27:16Z

4

"no implicit conversion of String into Integer" usually comes when you're trying to use an array as a hash. Array[] expects an index (integer). Your data is a hash inside an array inside a hash :

You need :

data['movie1'][0]['name']

or

data.dig('movie1', 0, 'name')

answered Feb 10, 2017 at 23:27

Eric Duminil

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