mlab - Unable to execute queries on MongoLab via CURL -

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i tried executing query on mongolab using curl send http request, failing error { "message" : "please provide valid api key."} . im using right api key , using same key im able write collection on mongolab failing read form same . here how used curl achieve objective 

curl  'https://api.mongolab.com/api/1/databases/mydb/collections/mycoll?q={"2sf5hzcp":{$exists:true}}&fo=true&apikey=xxxxxxxxx'

how fix ?

try replacing '{' , '}' characters url encoded equivalents (%7b , %7d respectively):

curl  'https://api.mongolab.com/api/1/databases/mydb/collections/mycoll?q=%7b"2sf5hzcp":%7b$exists:true%7d%7d&fo=true&apikey=xxxxxxxxx'

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