YAML - Full Length Example

The following full-length example specifies the construct of YAML which includes symbols and various representations which will be helpful while converting or processing them in JSON format. These attributes are also called as key names in JSON documents. These notations are created for security purposes.

The above YAML format represents various attributes of defaults, adapter, and host with various other attributes. YAML also keeps a log of every file generated which maintains a track of error messages generated. On converting the specified YAML file in JSON format we get a desired output as mentioned below −

defaults: &defaults
   adapter:  postgres
   host:     localhost

development:
   database: myapp_development
   <<: *defaults

test:
   database: myapp_test
   <<: *defaults

Let’s convert the YAML to JSON format and check on the output.

{
   "defaults": {
      "adapter": "postgres",
      "host": "localhost"
   },
   "development": {
      "database": "myapp_development",
      "adapter": "postgres",
      "host": "localhost"
   },
   "test": {
      "database": "myapp_test",
      "adapter": "postgres",
      "host": "localhost"
   }
}

The defaults key with a prefix of “ <<: *” is included as and when required with no need to write the same code snippet repeatedly.