GoでJSONとYAMLを相互変換するツールを作った ref: http://qiita.com/y13i/items/ee93ea07ecff11990676

file0.txt

$ cat example.json
{"employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter", "lastName":"Jones"}
]}
$ j2y example.json
employees:
- firstName: John
  lastName: Doe
- firstName: Anna
  lastName: Smith
- firstName: Peter
  lastName: Jones

file1.txt

$ j2y -o example.yml example.json
$ cat example.yml
employees:
- firstName: John
  lastName: Doe
- firstName: Anna
  lastName: Smith
- firstName: Peter
  lastName: Jones

file2.txt

$ j2y -r example.yml
{
  "employees": [
    {
      "firstName": "John",
      "lastName": "Doe"
    },
    {
      "firstName": "Anna",
      "lastName": "Smith"
    },
    {
      "firstName": "Peter",
      "lastName": "Jones"
    }
  ]
}

file3.txt

$ j2y -r -m example.yml
{"employees":[{"firstName":"John","lastName":"Doe"},{"firstName":"Anna","lastName":"Smith"},{"firstName":"Peter","lastName":"Jones"}]}

file4.txt

$ j2y -e '{"employees":[{"firstName":"John","lastName":"Doe"},{"firstName":"Anna","lastName":"Smith"},{"firstName":"Peter","lastName":"Jones"}]}'
employees:
- firstName: John
  lastName: Doe
- firstName: Anna
  lastName: Smith
- firstName: Peter
  lastName: Jones

file5.txt

$ echo '{"employees":[{"firstName":"John","lastName":"Doe"},{"firstName":"Anna","lastName":"Smith"},{"firstName":"Peter","lastName":"Jones"}]}' | j2y
employees:
- firstName: John
  lastName: Doe
- firstName: Anna
  lastName: Smith
- firstName: Peter
  lastName: Jones