How to return a JSON object from an Azure Function with Node.js

Question

With Azure Functions, what do you need to do to return a JSON object in the body from a function written in node.js? I can easily return a string, but when I try to return a json object as shown below I appear to have nothing returned.

context.res = {    body: jsonData,    contentType: 'application/json' }; 

Answer 1

Based on my recent testing (March 2017). You have to explicitly add content type to response headers to get json back otherwise data shows-up as XML in browser.

"Content-Type":"application/json"

res = {     status: 200, /* Defaults to 200 */     body: {message: "Hello " + (req.query.name || req.body.name)},     headers: {         'Content-Type': 'application/json'     } }; 

Full Sample below:

module.exports = function (context, req) {     context.log('JavaScript HTTP trigger function processed a request.');     context.log(context);      if (req.query.name || (req.body && req.body.name)) {         res = {             // status: 200, /* Defaults to 200 */             body: {message: "Hello " + (req.query.name || req.body.name)},             headers: {                 'Content-Type': 'application/json'             }         };     }     else {         res = {             status: 400,             body: "Please pass a name on the query string or in the request body"         };     }     context.done(null, res); };