Post JSON data to a flow
Problem
You want to post JSON data in to a flow.
Solution
Use the HTTP In node to listen for POST requests that
have their Content-Type set to application/json and access the parsed JSON as
properties of msg.payload.
Example
[~]$ curl -X POST -d '{"name":"Nick"}' -H "Content-type: application/json" http://localhost:1880/hello-form
<html>
<head></head>
<body>
<h1>Hello Nick!</h1>
</body>
</html>
Discussion
When the HTTP In node receives a request with the Content-Type
header set to application/json it parses the body of the request and makes the data
available under msg.payload:
var name = msg.payload.name;
