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
[{"id":"5b98a8ac.a46758","type":"http in","z":"3045204d.cfbae","name":"","url":"/hello-form","method":"post","swaggerDoc":"","x":120,"y":820,"wires":[["bba61009.4459f"]]},{"id":"bba61009.4459f","type":"template","z":"3045204d.cfbae","name":"page","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"<html>\n <head></head>\n <body>\n <h1>Hello {{ payload.name }}!</h1>\n </body>\n</html>","x":290,"y":820,"wires":[["6ceb930a.93146c"]]},{"id":"6ceb930a.93146c","type":"http response","z":"3045204d.cfbae","name":"","x":430,"y":820,"wires":[]}]
[~]$ 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;
