Parsing a Json String in Ruby

Parsing a JSON string in Ruby

This looks like JavaScript Object Notation (JSON). You can parse JSON that resides in some variable, e.g. json_string, like so:

require 'json'
JSON.parse(json_string)

If you’re using an older Ruby, you may need to install the json gem.

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There are also other implementations of JSON for Ruby that may fit some use-cases better:

• YAJL C Bindings for Ruby
• JSON::Stream

Parse a json that contain json string

Just call JSON.parse on the values again:

obj.transform_values { |v| JSON.parse(v) }
#=> {:Name=>{"FirstName"=>"Douglas", "LastName"=>"Crockford"}}

When you are still on Ruby <2.4 then there a more steps:

obj.map { |k, v| [k, JSON.parse(v)] }.to_h 

Parsing from a JSON file in Ruby and Extract numbers from Nested Hashes

You can use Array#map to collect the reviews.

reviews = json['sentiment_analysis'][0]
positive_reviews = reviews['positive']
negative_reviews = reviews['negative']

positive_reviews.map { |review| review['score'] }
=> [0.6748984055823062, 0.6280145725181376]

negative_reviews.map { |review| review['score'] }
=> [-0.7923352042939829, -0.5734506634410159]

Hope this helps!

How to parsing JSON string parameters in rails

You could do something like this with native Ruby JSON library:

@json = JSON.parse(request.body.read)
username = @json['username']
password = @json['password']

You take the POST request data and then parse to JSON.

Parsing JSON in ruby?

JSON.parse() expects a string input. So, array can't be used here.
Instead you can try as follows,

JSON.parse('[{"test": "test_a", "doc_type": { "id": 32 }}]')

Or

JSON.parse(arrayResponse.to_json)

to_json returns JSON string representation. Doc: https://apidock.com/rails/Hash/to_json

Ruby/Rails convert string to JSON - JSON.parse produces JSON::ParserError

It's an issue on versions of json gem (<2). To avoid it you should use versions of json >2. So you might try to upgrade your rails version or just use quirks_mode: true.

JSON.parse(json_test, quirks_mode: true)

Here is a link to the issue on github json issue

Parsing JSON data from Ruby variable

You can't toss the @result data directly to JS because, although what you think, it is not valid JSON (noted the hash-rockets “=>”?)

The solution is to properly format the @result data as JSON, using ruby, then passing the resulting data to JS. For that you can simply do:

require 'json'
@result.to_json

And then, on JS side:

var apiData = JSON.parse('<%= @result %>');

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