How to call an api from another api in expressjs? - node.js

Question

I have an api like this:
app.get('/test', (req, res) => {
console.log("this is test");
});
and another api:
app.get('/check', (req, res) => {
//I want to call "test" api without redirect to it.
});
I want to call "test" api in "check" api without redirect to "test" api, just do the function in the "test" api.
Above is the example code. 'Cause I dont' want to rewrite function from "test" api to "check"

Answer 1

Simple solution is to define a method which can be called using both request routes.
app.get('/test', (req, res) => {
console.log("this is test");
callMeMayBe();
});
callMeMayBe()
{
//Your code here
}

Answer 2

To "call an API from another API", a quick and easy way is sending HTTP request inside Express server, browser would never know an internal HTTP invocation happens, not mention page-redirect. The benefit of this design includes:
There's no need to change the current API design.
The API invocation can be made exact like sent from browser.
Here is an example:
var http = require('http');
router.get('/test', function(req, res) {
res.end('data_from_test');
});
router.get('/check', function(req, res) {
var request = http.request({
host: 'localhost',
port: 3000,
path: '/test',
method: 'GET',
headers: {
// headers such as "Cookie" can be extracted from req object and sent to /test
}
}, function(response) {
var data = '';
response.setEncoding('utf8');
response.on('data', (chunk) => {
data += chunk;
});
response.on('end', () => {
res.end('check result: ' + data);
});
});
request.end();
});
The result of GET /check would be:
check result: data_from_test

Answer 3

Create a common middleware which need to executed for both the routes.
Below is the code snippet for the same:
app.get('/test', test);
app.get('/check', check, test);
check and test are the middlewares which is used in common.

Answer 4

first define the /test handling function separately.
then you have two options.
// ========( 1 )====== testHandler as another function =============
// you can call this function where ever you want.
var testHandler = function(req, res){
//do something
}
app.get('/test', testHandler);
app.get('/check', function(req, res){
// you can call testHandler function here
testHandler(req, res);
});
// ========( 2 )======= testHandler as a middleware =================
// if you want to call testHandler before running check handler function.
//
var testHandler = function(req, res, next){
//do something
...
next();
}
app.get('/test', testHandler, function(req, res){});
app.get('/check', testHandler, function(req, res){
// you can call testHandler function here
testHandler(req, res);
});