JSON validation with ruby

I have to deal with json files provided by a user, so I want to make sure the JSON structure is correct. JSON schema validators are quite popular in JS world, but this was the first time I tried them in Ruby.

The steps are:

• Create a schema to test against (the standard is json-schema).
• Parse the JSON
• Validate the JSON against the schema

To create the json-schema I tend to use a tool that creates a schema from an example JSON file, like this one. It's not perfect, but provides a good starting point.

To parse JSON I used the ruby's json standard library.

To validate the JSON against the schema I used https://github.com/ruby-json-schema/json-schema gem.

Show me the code:

require 'json'
require 'json-schema'

SCHEMA = {
  type: 'object',
  properties: {
    ...
  }
}

begin
  contents = JSON.parse(raw)
  errors = JSON::Validator.fully_validate(SCHEMA, contents)
rescue JSON::ParserError
  errors = ['Invalid JSON']
end

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