I am trying to use CURL to put JSON data in my request by using this syntax:
curl -X POST -H "Content-Type: application/json" -d '{"firstName":"First", "lastName":"last", "email":"[email protected]", "username":"user1", "password":"pass1"}' 127.0.0.1:3001/users
now the CMD is showing this error:
Please help!
Well I used:
curl -X POST -H "Content-Type: application/json" -d "{\"firstName\": \"First\", \"lastName\": \"last\", \"email\": \"[email protected]\", \"username\": \"user1\", \"password\": \"pass1\"}" 127.0.0.1:3001/users
And it worked! Shout out to Ross Kinard for helping with a temporary solution so that this question now specifies both way in which we can post using CURL in cmd.
I'd let batch do the escaping by replacing all " with \"
set "json={"firstName":"First", "lastName":"last", "email":"[email protected]", "username":"user1", "password":"pass1"}"
set "json=%json:"=\"%"
echo curl -X POST -H "Content-Type: application/json" -d "%json%" 127.0.0.1:3001/users
Remove the echo in front of curl before using.
C:\Windows\system32\ is presumably before in the environment path, so include the path to your curl then. 
I had a similar problem earlier, and my solution was to save the post data in a .json file and call it in the request.
curl -v -X POST https://someSite.com/randrand \
-H 'Content-Type: application/json' \
-H 'User-Agent: (iPhone; iOS 7.1; Scale/2.00)' \
--data @data.json
'the same way a Unix shell would.