How to convert a ruby hash object to JSON

Question

How to convert a ruby hash object to JSON  So I am trying this example below  amp  it doesn t work   I was looking at the RubyDoc and obviously Hash object doesn t have a to json method  But I am reading on blogs that Rails supports active record to json and also supports hash to json  I can understand ActiveRecord is a Rails object  but Hash is not native to Rails  it s a pure Ruby object  So in Rails you can do a hash to json  but not in pure Ruby    car     make   gt   bmw    year   gt   2003   car to json

User · Answer

Add the following line on the top of your file

require 'json'

Then you can use:

car = {:make => "bmw", :year => "2003"}
car.to_json

Alternatively, you can use:

JSON.generate({:make => "bmw", :year => "2003"})

User · Answer

require  json ext    to use the C based extension instead of json pure  puts  hash  123  to json

User · Answer

You should include json in your file  For Example   require  json   your hash    one   1   two   2   your hash to json   For more knowledge about json you can visit below link  Json Learning

User · Answer

You can also use JSON generate   require  json   JSON generate   foo   bar       gt      foo     bar       Or its alias  JSON unparse   require  json   JSON unparse   foo   bar       gt      foo     bar

User · Answer

One of the numerous niceties of Ruby is the possibility to extend existing classes with your own methods  That s called  class reopening  or monkey-patching  the meaning of the latter can vary  though    So  take a look here   car     make   gt   bmw    year   gt   2003       gt    make  gt  bmw    year  gt  2003   car to json   NoMethodError  undefined method  to json  for   make  gt  bmw    year  gt  2003   Hash     from  irb  11     from  usr bin irb 12 in   lt main gt   require  json      gt  true car to json     gt     make   bmw   year   2003      As you can see  requiring json has magically brought method to json to our Hash

[ruby-on-rails] How to convert a ruby hash object to JSON?

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