I am using IBM Bluemix to make a web service for a school project.
My project needs to request JSON data from two APIs, for use in the project.
The first one is a http.request, which I executed just fine. For the second one, however, I need a https.request - and that is where the trouble comes from.
I don't know how to get a JSON through a https request. I've been trying to adapt the code for the http one, but my efforts have rendered useless.
How can I request a JSON via https?
Here is my .jsfile:
// Hello.
//
// This is JSHint, a tool that helps to detect errors and potential
// problems in your JavaScript code.
//
// To start, simply enter some JavaScript anywhere on this page. Your
// report will appear on the right side.
//
// Additionally, you can toggle specific options in the Configure
// menu.
function main() {
return 'Hello, World!';
}
main();/*eslint-env node*/
//------------------------------------------------------------------------------
// node.js starter application for Bluemix
//------------------------------------------------------------------------------
// HTTP request - duas alternativas
var http = require('http');
var request = require('request');
//HTTPS request
var https = require('https');
var https = require('https');
var fs = require('fs');
// cfenv provides access to your Cloud Foundry environment
// for more info, see: https://www.npmjs.com/package/cfenv
var cfenv = require('cfenv');
//chama o express, que abre o servidor
var express = require('express');
// create a new express server
var app = express();
// serve the files out of ./public as our main files
app.use(express.static(__dirname + '/public'));
// get the app environment from Cloud Foundry
var appEnv = cfenv.getAppEnv();
// start server on the specified port and binding host
app.listen(appEnv.port, '0.0.0.0', function() {
// print a message when the server starts listening
console.log("server starting on " + appEnv.url);
});
app.get('/home1', function (req,res) {
http.get('http://developers.agenciaideias.com.br/cotacoes/json', function (res2) {
var body = '';
res2.on('data', function (chunk) {
body += chunk;
});
res2.on('end', function () {
var json = JSON.parse(body);
var CotacaoDolar = json["dolar"]["cotacao"];
var VariacaoDolar = json["dolar"]["variacao"];
var CotacaoEuro = json["euro"]["cotacao"];
var VariacaoEuro = json["euro"]["variacao"];
var Atualizacao = json["atualizacao"];
obj=req.query;
DolarUsuario=obj['dolar'];
RealUsuario=Number(obj['dolar'])*CotacaoDolar;
EuroUsuario=obj['euro'];
RealUsuario2=Number(obj['euro'])*CotacaoEuro;
Oi=1*VariacaoDolar;
Oi2=1*VariacaoEuro;
if (VariacaoDolar<0) {
recomend= "Recomenda-se, portanto, comprar dólares.";
}
else if (VariacaoDolar=0){
recomend="";
}
else {
recomend="Recomenda-se, portanto, vender dólares.";
}
if (VariacaoEuro<0) {
recomend2= "Recomenda-se, portanto, comprar euros.";
}
else if (VariacaoEuro=0){
recomend2="";
}
else {
recomend2="Recomenda-se,portanto, vender euros.";
}
res.render('cotacao_response.jade', {
'CotacaoDolar':CotacaoDolar,
'VariacaoDolar':VariacaoDolar,
'Atualizacao':Atualizacao,
'RealUsuario':RealUsuario,
'DolarUsuario':DolarUsuario,
'CotacaoEuro':CotacaoEuro,
'VariacaoEuro':VariacaoEuro,
'RealUsuario2':RealUsuario2,
'recomend':recomend,
'recomend2':recomend2,
'Oi':Oi,
'Oi2':Oi2
});
app.get('/home2', function (req,res) {
https.get('https://www.quandl.com/api/v3/datasets/BCB/432.json?api_key=YOUR_API_KEY', function (res3) {
var body = '';
res3.on('data', function (chunk) {
body += chunk;
});
res3.on('end', function () {
var x=json.dataset.data[0][1];
console.log("My JSON is "+x); });
});
});
});
});
});
Your https.get should work as set up. There were a few other issues with your code that caused it to break, which I'm outlining below with explanations:
1. Potentially incorrect nesting of the /home2 route
Your declaration of the /home2 route was inside the declaration of your /home1 route. It is likely that you meant it to be outside. I've fixed this (and also fixed some indentation) in the code below.
2. json is undefined in the /home2 route's https.get callback
The variable json is not defined before use in the https.get callback function. You will need a line similar to the one you have in the http.get callback: var json = JSON.parse(body);.
Here's the fixed code for the routes
app.get('/home1', function (req,res) {
http.get('http://developers.agenciaideias.com.br/cotacoes/json', function (res2) {
var body = '';
res2.on('data', function (chunk) {
body += chunk;
});
res2.on('end', function () {
var json = JSON.parse(body);
var CotacaoDolar = json["dolar"]["cotacao"];
var VariacaoDolar = json["dolar"]["variacao"];
var CotacaoEuro = json["euro"]["cotacao"];
var VariacaoEuro = json["euro"]["variacao"];
var Atualizacao = json["atualizacao"];
obj=req.query;
DolarUsuario=obj['dolar'];
RealUsuario=Number(obj['dolar'])*CotacaoDolar;
EuroUsuario=obj['euro'];
RealUsuario2=Number(obj['euro'])*CotacaoEuro;
Oi=1*VariacaoDolar;
Oi2=1*VariacaoEuro;
if (VariacaoDolar<0) {
recomend= "Recomenda-se, portanto, comprar dólares.";
}
else if (VariacaoDolar=0){
recomend="";
}
else {
recomend="Recomenda-se, portanto, vender dólares.";
}
if (VariacaoEuro<0) {
recomend2= "Recomenda-se, portanto, comprar euros.";
}
else if (VariacaoEuro=0){
recomend2="";
}
else {
recomend2="Recomenda-se,portanto, vender euros.";
}
res.render('cotacao_response.jade', {
'CotacaoDolar':CotacaoDolar,
'VariacaoDolar':VariacaoDolar,
'Atualizacao':Atualizacao,
'RealUsuario':RealUsuario,
'DolarUsuario':DolarUsuario,
'CotacaoEuro':CotacaoEuro,
'VariacaoEuro':VariacaoEuro,
'RealUsuario2':RealUsuario2,
'recomend':recomend,
'recomend2':recomend2,
'Oi':Oi,
'Oi2':Oi2
});
});
});
});
app.get('/home2', function (req,res) {
https.get('https://www.quandl.com/api/v3/datasets/BCB/432.json?api_key=YOUR_API_KEY', function (res3) {
var body = '';
res3.on('data', function (chunk) {
body += chunk;
});
res3.on('end', function () {
var json = JSON.parse(body);
var x=json.dataset.data[0][1];
console.log("My JSON is "+x);
res.send('done https: JSON result: '+x);
});
});
});
Final note
You added your API key in the https URL. I would recommend changing the key, if sensitive information is involved.
The HTTPS server and client API is almost identical to the HTTP API.In fact, the client API is the same, and the HTTPS server only differs in that it needs a certificate file.
Starting the server
To start the HTTPS server, you need to read the private key and certificate. Note that readFileSync is used in this case, since blocking to read the certificates when the server starts is acceptable:
// HTTPS
var https = require('https');
// read in the private key and certificate
var pk = fs.readFileSync('./privatekey.pem');
var pc = fs.readFileSync('./certificate.pem');
var opts = { key: pk, cert: pc };
// create the secure server
var serv = https.createServer(opts, function(req, res) {
console.log(req);
res.end();
});
// listen on port 443
serv.listen(443, '0.0.0.0');
Note that on Linux, you may need to run the server with higher privileges to bind to port 443. Other than needing to read a private key and certificate, the HTTPS server works like the HTTP server.
Related
I am trying to consume a RESTful API for JSON data and trying to display it on the HTML page.
Here is the code for parsing API into JSON data.
var https = require('https');
var schema;
var optionsget = {
host : 'host name', // here only the domain name
port : 443,
path : 'your url', // the rest of the url with parameters if needed
method : 'GET' // do GET
};
var reqGet = https.request(optionsget, function(res) {
console.log("statusCode: ", res.statusCode);
var chunks = [];
res.on('data', function(data) {
chunks.push(data);
}).on('end', function() {
var data = Buffer.concat(chunks);
schema = JSON.parse(data);
console.log(schema);
});
});
reqGet.end();
reqGet.on('error', function(e) {
console.error(e);
});
var express = require('express');
var app = express();
app.get('/getData', function (request, response) {
//console.log( data );
response.end(schema);
})
var server = app.listen(8081, function () {
var host = server.address().address
var port = server.address().port
console.log("Example app listening at http://%s:%s", host, port)
})
I am able to get the data in the JSON format but how do I display it in the HTML page? I am trying to do it using node js as I don't want to use jquery for that. Any help would be greatly appreciated. Thanks
your json can render through ejs
npm i ejs
var app = express();
app.set('view engine', 'ejs');
app.use(express.static(__dirname+'/public'));
app.get('/view/getData', function (request, response) {
//here view/getData is getData.ejs file in the view folder
response.render(__dirname+'/public/view/getData'',{schema: schema});
//schema is the object wich reference through the view in ejs template
});
your view file here getData.ejs
//store your getData in view/getData.ejs
<h> <%= schema[0]%> </h>//your json data here
basic ejs reference here
res.render brief explanation here
I have just started using nodejs and koajs, and I would like to take the ip address from here: https://api.ipify.org?format=json and paste it on my site or set it as a header. Right now I have the following:
var koa = require('koa');
var app = koa();
var http = require('https');
var a = http.get("https://api.ipify.org?format=json",function(res) {
var data = "";
res.on("data", function (chunk) {
data += chunk;
});
res.on('end', function() {
par = JSON.parse(data);
console.log(par.ip);
});
});
app.listen(8888);
app.use(function *(){
this.response.set("userIp",par.ip);
this.body = "ipadress: "; //this doesn't see par.ip;
});
I know that I am probably doing something very wrong here but yea I am currently stuck because I have no idea how to take par.ip and assign it to this.body and set.
Would anyone be able to tell me how to achieve this or an alternative to the problem? Thanks in advance.
Assuming the response from api.ipify.org doesn't change.
var koa = require('koa');
var app = koa();
var http = require('https');
var a = http.get("https://api.ipify.org?format=json",function(res) {
var data = "";
res.on("data", function (chunk) {
data += chunk;
});
res.on('end', function() {
par = JSON.parse(data);
console.log(par.ip);
app.use(function *(){
this.response.set("userIp",par.ip);
this.body = "ipadress: "; //this doesn't see par.ip;
});
app.listen(8888);
});
});
Otherwise if the response from api.ipify.org constantly changes, you might to do the http request on every incoming request.
I would like to display on my page some data which I have in dsa.json file. I am using express with vue.
Here's my code from the server.js:
var data;
fs.readFile('./dsa.json', 'utf8', (err, data) => {
if (err) throw err;
exports.data = data;
});
Here's code from between <script> tags in index.html
var server = require(['../server']);
var data = server.data;
var scoreboards = new Vue({
el: '#scoreboard',
data: {
students: data
}
});
I am using requirejs (CDN) to require server between <script> tags in index.html.
index.html is in public directory whereas dsa.json and server.js are in the main catalogue.
Here are the errors I get in the client:
require.min.js:1 GET http://localhost:3000/server.js
require.min.js:1 Uncaught Error: Script error for "../server"
I think it has something to do with context and scope but I don't know what exactly.
I am using Chrome.
Your approach is completely wrong. You can't include the server script on your page. Also, I'm not a NodeJS ninja, yet I don't think that exporting the data inside the function will work -> exports.data = data.
The workaround:
Server side:
const fs = require('fs');
const express = require('express');
const app = express();
const data = fs.readFileSync('./dsa.json', 'utf8'); // sync is ok in this case, because it runs once when the server starts, however you should try to use async version in other cases when possible
app.get('/json', function(req, res){
res.send(data);
});
Client side:
var xhr = new XMLHttpRequest();
xhr.open('GET', '/json', true);
xhr.addEventListener('load', function() {
var scoreboards = new Vue({
el: '#scoreboard',
data: {
students: JSON.parse(xhr.response)
}
});
});
xhr.addEventListener('error', function() {
// handle error
});
xhr.send();
I am using IBM Bluemix to make a web service for a school project.
I need to transform the .csv data I have in a directory in my computer into a .json file, so I can manipulate this information.
I am using the fast-csv package for Node JS, but I am having trouble with the code.
In the end of my .js file, there is a piece of code that is supposed to get the .csv file and convert it to JSON. I obtained it in the fast-csv documentation webpage.
When I run it, nothing happens and I can't fin out why. How can I check if the code is really getting the .csv file and transforming it into a .json one?
The Cambio.csv file is in the same directory of my .js one.
// Hello.
//
// This is JSHint, a tool that helps to detect errors and potential
// problems in your JavaScript code.
//
// To start, simply enter some JavaScript anywhere on this page. Your
// report will appear on the right side.
//
// Additionally, you can toggle specific options in the Configure
// menu.
function main() {
return 'Hello, World!';
}
main();/*eslint-env node*/
//------------------------------------------------------------------------------
// node.js starter application for Bluemix
//------------------------------------------------------------------------------
// HTTP request - duas alternativas
var http = require('http');
var request = require('request');
// cfenv provides access to your Cloud Foundry environment
// for more info, see: https://www.npmjs.com/package/cfenv
var cfenv = require('cfenv');
//chama o express, que abre o servidor
var express = require('express');
// create a new express server
var app = express();
// serve the files out of ./public as our main files
app.use(express.static(__dirname + '/public'));
// get the app environment from Cloud Foundry
var appEnv = cfenv.getAppEnv();
// start server on the specified port and binding host
app.listen(appEnv.port, '0.0.0.0', function() {
// print a message when the server starts listening
console.log("server starting on " + appEnv.url);
});
app.get('/home1', function (req,res) {
http.get('http://developers.agenciaideias.com.br/cotacoes/json', function (res2) {
var body = '';
res2.on('data', function (chunk) {
body += chunk;
});
res2.on('end', function () {
var json = JSON.parse(body);
var cotacao = json["bovespa"]["cotacao"];
var CotacaoDolar = json["dolar"]["cotacao"];
var VariacaoDolar = json["dolar"]["variacao"];
var CotacaoEuro = json["euro"]["cotacao"];
var VariacaoEuro = json["euro"]["variacao"];
var Atualizacao = json["atualizacao"];
console.log('url', req.originalUrl);
obj=req.query;
DolarUsuario=obj['dolar'];
RealUsuario=Number(obj['dolar'])*CotacaoDolar;
EuroUsuario=obj['euro'];
RealUsuario2=Number(obj['euro'])*CotacaoEuro;
if (VariacaoDolar<0) {
recomend= "Recomenda-se, portanto, comprar dólares.";
}
else if (VariacaoDolar=0){
recomend="";
}
else {
recomend="Recomenda-se,portanto, vender dólares.";
}
if (VariacaoEuro<0) {
recomend2= "Recomenda-se, portanto, comprar euros.";
}
else if (VariacaoEuro=0){
recomend2="";
}
else {
recomend2="Recomenda-se,portanto, vender euros.";
}
res.render('cotacao_response.jade', {
'CotacaoDolar':CotacaoDolar,
'VariacaoDolar':VariacaoDolar,
'Atualizacao':Atualizacao,
'RealUsuario':RealUsuario,
'DolarUsuario':DolarUsuario,
'CotacaoEuro':CotacaoEuro,
'VariacaoEuro':VariacaoEuro,
'RealUsuario2':RealUsuario2,
'recomend':recomend,
'recomend2':recomend2
});
var csv = require("fast-csv");
csv
.fromPath("Cambio.csv")
.on("record", function(data){
console.log(data);
})
.on("end", function(){
console.log("done");
});
});
});
});
The code did not work because it was missing views engine setup.
After adding the following lines after var app = express();:
// view engine setup
var path = require('path');
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
and creating a sample Cambio.csv on the application root directory (same dir as app.js):
$ more Cambio.csv
mercado,cotacao,variacao
bovespa,1234,-2.3
dolar,3.777,0.23
euro,4.233,0.12
I run node app.js and point my browser to:
http://http://localhost:6006/home1
Output was:
$ node app.js
server starting on http://localhost:6006
url /home1
[ 'mercado', 'cotacao', 'variacao' ]
[ 'bovespa', '1234', '-2.3' ]
[ 'dolar', '3.777', '0.23' ]
[ 'euro', '4.233', '0.12' ]
I'm using the following code to send a session description (tiny JSON code - http://www.ietf.org/rfc/rfc2327.txt).
function sendMessage(message) {
var msgString = JSON.stringify(message);
console.log('C->S: ' + msgString);
path = '/message?r=67987409' + '&u=57188688';
var xhr = new XMLHttpRequest();
xhr.open('POST', path, true);
xhr.send(msgString);
}
I'm not sure how to go about retreiving the JSON on my Node.js server.
Here's a code that can handle POST request in node.js .
var http = require('http');
var server = http.createServer(function (request, response) {
if (request.method == 'POST') {
var body = '';
request.on('data', function (data) {
body += data;
});
request.on('end', function () {
var POST = JSON.parse(body);
// POST is the post data
});
}
});
server.listen(80);
Hope this can help you.