Jsup

Jsup produces json using oj. It is really fast, simple and reliable. If speed is what you are looking for in your APIs then you should check it out. If you have a complex architecture you should probably check gems like roar, jbuilder, serializers etc.

Add this line to your application's Gemfile:

gem 'jsup'

And then execute:

bundle

Or install it yourself as:

gem install jsup

user = User.first
Jsup.produce do |j|
  j.name user.name
  j.email user.email
end

Will produce:

{
  "name": "John",
  "email": "john@johnson.com"
}

Jsup.produce do |j|
  j.name 'Stefan'
  j.fetch(@address, :city)
end

Will produce:

{
  "name": "Stefan",
  "city": "Sofia"
}

You can fetch multiple attributes:

j.fetch(@address, :city, :zip_code, :street)

You can also produce nested content:

Jsup.produce do |j|
  j.name 'Stefan'
  j.address do |ja|
    ja.street '13 march'
    ja.city 'Sofia'
  end
end

Will produce:

{
  "name": "Stefan",
  "address":
    {
      "street": "13 march",
      "city": "Sofia"
    }
}

If you want to extract from a hash it is also possible:

Jsup.produce do |j|
  j.fetch({first: 'my', last: 'initial'}, :first, :last)
end

{
  "first": "my",
  "last": "initial"
}

For rather simple data structures jsup is way faster than jbuilder:

def jb
  Jbuilder.encode do |person|
    person.name 'Stefan'
    person.email 'test@test.com'
    person.address 'some'
  end
end

def js
  Jsup.produce do |person|
    person.name 'Stefan'
    person.email 'test@test.com'
    person.address 'some'
  end
end


Benchmark.bm do |x|
  x.report('jbuilder') { 10000.times { jb } }
  x.report('jsup') { 10000.times { js } }
end

Results:

user     system      total        real
jbuilder  0.110000   0.000000   0.110000 (  0.112200)
jsup  0.030000   0.000000   0.030000 (  0.025732)

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/wizardone/jsup. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.