Convert JSON to YAML. Parsing JSON to YAML

Question

I'm working with configuration files so I need to convert JSON to YAML. For example I have this JSON file:

{
  "foo": "bar",
  "baz": [ "qux","quxx"],
  "corge": null,
  "grault": 1,
  "garply": true,
  "waldo": "false",
  "fred": "undefined",
  "emptyArray": [],
  "emptyObject": {},
  "emptyString": ""
}

The result should be YAML:

foo: "bar"
baz: 
  - "qux"
  - "quxx"
corge: null
grault: 1
garply: true
waldo: "false"
fred: "undefined"
emptyArray: []
emptyObject: {}
emptyString: ""

Could you help me?

Answer 1

You can convert JSON to YAML with two lines of code in Jackson :

import java.io.IOException;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLMapper;

public class Library {

    public String asYaml(String jsonString) throws JsonProcessingException, IOException {
        // parse JSON
        JsonNode jsonNodeTree = new ObjectMapper().readTree(jsonString);
        // save it as YAML
        String jsonAsYaml = new YAMLMapper().writeValueAsString(jsonNodeTree);
        return jsonAsYaml;
    }

}

You will need to add dependencies to Jackson Core, DataBind and DataFormat YAML. Below is a snippet for Gradle:

compile 'com.fasterxml.jackson.core:jackson-core:2.8.6'
compile 'com.fasterxml.jackson.core:jackson-databind:2.8.6'
compile 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.8.6'

Answer 2

Here's a one liner for a file, suitable for sticking in a bash script. This should work on most default pythons on most systems:

python -c 'import json; import yaml; print(yaml.dump(json.load(open("inputfile"))))'

Answer 3

http://jsontoyaml.com/

this website may can help you. It can be used in Bash, JavaScript, JavaScript (browser only), Ruby, Python, Perl, Java..

Answer 4

I'd suggest you consider Data Transformer (disclaimer - I'm its developer). It converts between JSON, YML, and other formats.

You can get it from the Mac App Store or theMicrosoft Store .

Answer 5

function yaml_validate {
  python -c 'import sys, yaml, json; yaml.safe_load(sys.stdin.read())'
}

function yaml2json {
  python -c 'import sys, yaml, json; print(json.dumps(yaml.safe_load(sys.stdin.read())))'
}

function yaml2json_pretty {
  python -c 'import sys, yaml, json; print(json.dumps(yaml.safe_load(sys.stdin.read()), indent=2, sort_keys=False))'
}

function json_validate {
  python -c 'import sys, yaml, json; json.loads(sys.stdin.read())'
}

function json2yaml {
  python -c 'import sys, yaml, json; print(yaml.dump(json.loads(sys.stdin.read())))'
}

More Bash tricks at http://github.com/frgomes/bash-scripts

Answer 6

If you need convert JSONobject to yaml (string). you need. Firstly get json string, then map, after that you can convert to yaml. Here the code:

  // this is your json object
  JSONObject jsonobject = new JSONObject(map);
  // get json string
  String prettyJSONString = jsonobject.toString(4);
  // mapping
  Map<String,Object> map = (Map<String, Object>) yaml.load(prettyJSONString);
  // convert to yaml string (yaml formatted string)
  String output = yaml.dump(map2);