How to convert characters like \x22 into a string?

I know this question was tagged as a python question, but if anyone would be looking for a tool that could encode such string online:

http://ddecode.com/hexdecoder

For a Unicode string under Python3, I found this:

value.encode('utf8').decode('unicode_escape')

https://stackoverflow.com/a/14820462/450917

Decode from string_escape:

>>> import json
>>> value = "{\\x22username\\x22:\\x229\\x22,\\x22password\\x22:\\x226\\x22,\\x22id\\x22:\\x222c8bfa56-f5d9\\x22, \\x22FName\\x22:\\x22AnkQcAJyrqpg\\x22}"
>>> value.decode('string_escape')
'{"username":"9","password":"6","id":"2c8bfa56-f5d9", "FName":"AnkQcAJyrqpg"}'
>>> json.loads(value.decode('string_escape'))
{u'username': u'9', u'password': u'6', u'id': u'2c8bfa56-f5d9', u'FName': u'AnkQcAJyrqpg'}