dump json into yaml

I got a .json file (named it meta.json) like this:

{
    "main": {
        "title": "今日は雨が降って",
        "description": "今日は雨が降って"
    }
}

I would like to convert it to a .yaml file (named it meta.yaml) like :

title: "今日は雨が降って"
description: "今日は雨が降って"

What I have done was :

import simplejson as json
import pyyaml

f = open('meta.json', 'r')
jsonData = json.load(f)
f.close()

ff = open('meta.yaml', 'w+')
yamlData = {'title':'', 'description':''}
yamlData['title'] = jsonData['main']['title']
yamlData['description'] = jsonData['main']['description']
yaml.dump(yamlData, ff)
# So you can  see that what I need is the value of meta.json     

But sadly, what I got is following:

{description: "\u4ECA\u65E5\u306F\u96E8\u304C\u964D\u3063\u3066", title: "\u4ECA\u65E5\
\u306F\u96E8\u304C\u964D\u3063"}

Why?

pyyaml.dump() has an allow_unicode option that defaults to None (all non-ASCII characters in the output are escaped). If allow_unicode=True, then it writes raw Unicode strings.

yaml.dump(data, ff, allow_unicode=True)

Bonus

You can dump JSON without encoding as follows:

json.dump(data, outfile, ensure_ascii=False)