send Content-Type: application/json post with node.js

Mikeal's request module can do this easily:

var request = require('request');

var options = {
  uri: 'https://www.googleapis.com/urlshortener/v1/url',
  method: 'POST',
  json: {
    "longUrl": "http://www.google.com/"
  }
};

request(options, function (error, response, body) {
  if (!error && response.statusCode == 200) {
    console.log(body.id) // Print the shortened url.
  }
});

Simple Example

var request = require('request');

//Custom Header pass
var headersOpt = {  
    "content-type": "application/json",
};
request(
        {
        method:'post',
        url:'https://www.googleapis.com/urlshortener/v1/url', 
        form: {name:'hello',age:25}, 
        headers: headersOpt,
        json: true,
    }, function (error, response, body) {  
        //Print the Response
        console.log(body);  
}); 

As the official documentation says:

body - entity body for PATCH, POST and PUT requests. Must be a Buffer, String or ReadStream. If json is true, then body must be a JSON-serializable object.

When sending JSON you just have to put it in body of the option.

var options = {
    uri: 'https://myurl.com',
    method: 'POST',
    json: true,
    body: {'my_date' : 'json'}
}
request(options, myCallback)

For some reason only this worked for me today. All other variants ended up in bad json error from API.

Besides, yet another variant for creating required POST request with JSON payload.

request.post({
    uri: 'https://www.googleapis.com/urlshortener/v1/url',
    headers: {'Content-Type': 'application/json'},
    body: JSON.stringify({"longUrl": "http://www.google.com/"})
});