A Korean (Language) Dictionary
if word in korean_data.keys():
    return korean_data[word]


This is better written as:

trans = korean_data.get(word)
if trans:
    return trans


This:

elif len(get_close_matches(word,korean_data.keys(),n=1,cutoff=.69)) &gt; 0:
    word = get_close_matches(word,korean_data.keys(),n=1,cutoff=.69)[0]
    return korean_data[word]


calls for a few changes. Firstly, you don't need an elif, simply an if - because the previous block returned. Also, you should avoid re-issuing that entire get_close_matches call, and instead write a temporary variable:

words = get_close_matches(word,korean_data.keys(),n=1,cutoff=.69)
if words:
    return korean_data[words[0]]


This:

return "Word does not exist."


is not really good practice. It's "in-band error information", i.e. you're mixing valid data with an error message. Instead, you should be raise-ing an exception, catching it in your calling code, and outputting an error message there.


  What other challenges would you recommend that incorporates both JSON and python?


Download or scrape a real Korean-English dictionary dataset, either incorporating it into your application or setting up a REST client to contact a translation server somewhere. If local, save it as a format more efficient than JSON - perhaps compressed pickle, or SQLite. There are many ways to store a local database, and each has its advantages and disadvantages, but that's a topic for another question.