Node.js / Express request. POST request body in invalid JSON

Question

I have a Polymer core-ajax component that sends some data to a Node.js server. The data is sent correctly (I can parse it using the Go web server), but Node parses it as a string body, which is the key to the empty string in the JSON object:

 { '{"count":-1,"uid":1}': '' } 

This is the code that sends the request from Polymer:

 sendCount: function(change) { console.log("Sending..."); console.log(JSON.stringify({"count": change, "uid": this.uid})); // ^ This prints: {"count":-1,"uid":1} this.$.ajax.body = JSON.stringify({"count": change, "uid": this.uid}); this.$.ajax.go(); } 

This is the Node code:

 app.post("/post", function(req, res) { console.log(res.headers); console.log(req.body); // Prints { '{"count":-1,"uid":1}': '' } res.setHeader('Content-Type', 'application/json'); res.end(JSON.stringify(req.body)); }); 

When I get the response back, it returns invalid JSON.

How should I parse JSON correctly in Node?

also:

 app.use(bodyParser.json()); app.use(bodyParser.urlencoded({ extended: false })); 

Answer 1

Set the core-ajax contentType="application/json" and handleAs="json" and fine-tune JSON before setting it as ajax.body .