input.json

{
  "object": "charge",
  "id": "chrg_test_5086xlsx4lghk9bpb75",
  "livemode": false,
  "location": "/charges/chrg_test_5086xlsx4lghk9bpb75",
  "amount": 100000,
  "currency": "thb",
  "description": null,
  "capture": true,
  "authorized": true,
  "reversed": false,
  "paid": true,
  "transaction": "trxn_test_5086xltqqbv4qpmu0ri",
  "refunded": 0,
  "refunds": {
    "object": "list",
    "from": "1970-01-01T00:00:00+00:00",
    "to": "2015-06-02T05:41:49+00:00",
    "offset": 0,
    "limit": 20,
    "total": 0,
    "data": [],
    "location": "/charges/chrg_test_5086xlsx4lghk9bpb75/refunds"
  },
  "failure_code": null,
  "failure_message": null,
  "card": {
    "object": "card",
    "id": "card_test_5086xl7amxfysl0ac5l",
    "livemode": false,
    "location": "/customers/cust_test_5086xleuh9ft4bn0ac2/cards/card_test_5086xl7amxfysl0ac5l",
    "country": "us",
    "city": "Bangkok",
    "postal_code": "10320",
    "financing": "",
    "last_digits": "4242",
    "brand": "Visa",
    "expiration_month": 10,
    "expiration_year": 2018,
    "fingerprint": "mKleiBfwp+PoJWB/ipngANuECUmRKjyxROwFW5IO7TM=",
    "name": "Somchai Prasert",
    "security_code_check": true,
    "created": "2015-06-02T05:41:46Z"
  },
  "customer": "cust_test_5086xleuh9ft4bn0ac2",
  "ip": null,
  "dispute": null,
  "created": "2015-06-02T05:41:49Z"
}

parse_json.go

package main

import "net/http"
import "encoding/json"

func main() {
	if e := http.ListenAndServe(":8080", http.HandlerFunc(handler)); e != nil {
		panic(e)
	}
}

func handler(resp http.ResponseWriter, req *http.Request) {
	defer req.Body.Close()

	result := map[string]interface{}{}
	if e := json.NewDecoder(req.Body).Decode(&result); e != nil {
		panic(e)
	}

	key := req.URL.Path[1:]
	if value, ok := result[key]; !ok {
		http.NotFound(resp, req)
	} else if e := json.NewEncoder(resp).Encode(value); e != nil {
		panic(e)
	}
}

parse_json.js

var http = require('http');

var server = http.createServer(function(req, resp) {
  var buffer = '';
  var key = req.url.substr(1);

  req.on('data', function(part) {
    buffer += part.toString();
  });

  req.on('end', function() {
    setImmediate(function() {
      resp.end(JSON.parse(buffer)[key]);
    });
  })
});

server.listen(8080);