Question

I want to convert such query string:

a=1&b=2

to json string

{"a":1, "b":2}

Any existing solution?

Answer 1

Python 3+

import json
from urllib.parse import parse_qs

json.dumps(parse_qs("a=1&b=2"))

Python 2:

import json
from urlparse import parse_qs

json.dumps(parse_qs("a=1&b=2"))

In both cases the result is

'{"a": ["1"], "b": ["2"]}'

This is actually better than your {"a":1, "b":2}, because URL query strings can legally contain the same key multiple times, i.e. multiple values per key.