I'm using request npm module
var request = require('request');
request('http://www.google.com', function (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body) // Show the HTML for the Google homepage.
}
})
my response return format such as "string". How to convert response to object?
I found answer
request('http://www.google.com', function (error, response, body) {
if (!error && response.statusCode == 200) {
var info = JSON.parse(body);
console.log(info ) // Show the HTML for the Google homepage.
}
})
Related
i am new in nodejs (using expressjs) and i am calling a rest api,i am getting
response as json in console(with two keys "id" and "text") but now i want to get "text" from
json response and want to pass in "assistant.ask",How can i do this ?
Here is my code
function (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body); //working
assistant.ask(body.text); // not working
}
else{
console.log(error);
}
Since your response is array, you need to access first item:
function (error, response, body) {
if (!error && response.statusCode == 200) {
assistant.ask(body[0].text);
}
else {
console.log(error);
}
}
I am using the request package to make a simple HTTP GET request to the npm API. I am trying to get the download counts for npm packages from an arbitrary function in my nodeJS backend.
Here is my updateDownloadCount.ts file:
export function updateDownloads() {
plugin.find(function (err, plugins: Array<any>) {
for (let plugin of plugins) {
var url = 'https://api.npmjs.org/downloads/point/last-month/' + plugin.package;
request(url, function (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body)
}
})
}
})
}
So that's fine and I get a string of outputs like:
{"downloads":17627637,"start":"2016-08-29","end":"2016-09-27","package":"request"}
however, when I try to access just the downloads count, i.e.
console.log(body.downloads);
I get undefined console logged... How can I access the body variables? I feel like this should be super simple, but I couldn't find any docs on it.
Try to parse body if it is string type
export function updateDownloads() {
plugin.find(function(err, plugins: Array < any > ) {
for (let plugin of plugins) {
var url = 'https://api.npmjs.org/downloads/point/last-month/' + plugin.package;
request(url, function(error, response, body) {
if (!error && response.statusCode == 200) {
if (body && typeof body == "string") {
body = JSON.parse(body);
}
console.log(body.downloads);
}
})
}
})
}
Still learning node. Based upon the following:
https://github.com/request/request
var request = require('request');
request('http://www.google.com', function (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body) // Show the HTML for the Google homepage.
}
})
I wish to create the above as a reusable block of code so thought I'd wrap it in a function passing the URL as a parameter such as:
var request = require('request');
var URL;
var request = require('request');
request('http://www.google.com', function (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body) // Show the HTML for the Google homepage.
}
})
function fetchURL (URL) {
request(URL, function (error, response, body) {
if (!error && response.statusCode == 200) {
return body;
}
});
};
var a = fetchURL('http://www.google.com');
console.log(a);
This works however I am unsure of whether "return body" is needed as it also works without this line. Happy to received comments on my coding style too as it's all new to me.
The pattern in Node is to provide a callback as an argument to an asynchronous function. By convention, this callback function has error as its first argument. For example:
function fetchURL(url, callback) {
request(url, function(error, response, body) {
if (!error && response.statusCode == 200) {
callback(null, body);
} else {
callback(error);
}
});
};
fetchURL('http://www.google.com', function(err, body) {
console.log(body);
});
Note that in your snippet, return body; is a return from the anonymous callback function passed into fetchURL(). fetchURL() itself returns nothing.
In one of the examples in the request's documents shows this example:
https://www.npmjs.com/package/request#custom-http-headers
var request = require('request');
var options = {
url: 'https://api.github.com/repos/request/request',
headers: {
'User-Agent': 'request'
}
};
function callback(error, response, body) {
if (!error && response.statusCode == 200) {
var info = JSON.parse(body);
console.log(info.stargazers_count + " Stars");
console.log(info.forks_count + " Forks");
}
}
request(options, callback)
Lets' say I want the value of the variable info return to me.
How do I do it?
You cannot pass a value from an asynchronous command. The most common strategy used in Node.js is to wrap the code that requires the info variable in a function and call that from the callback.
eg:
function callback(error, response, body) {
if (!error && response.statusCode == 200) {
functionThatUsesInfo(info);
}
}
I have urlARRAY that has some urls.
I did a loop and I did request to urls in the array one by one.
Some sites in urlARRAY are loading slow. Can I skip these?
var req = require('request');
urlARRAY.forEach(function(url) {
req(url, function (error, response, html) {
if (!error && response.statusCode == 200) {
console.log("success");
} else {
console.log("error");
}
});
}