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Programming Articles
Page 2198 of 2547
C++ program to take integer and float as input and return their sum
Suppose we have two numbers a and b, a is integer and b is a float. We shall have to take them from standard input and display the sum.So, if the input is like a = 10 b = 56.23, then the output will be Sum: 66.23To solve this, we will follow these steps −To display output into the standard output device we can use extraction operator ()ExampleLet us see the following implementation to get better understanding −#include using namespace std; int main(){ int a; float b; cout a >> b; cout
Read MoreUsing next() function in Express.js
Express.js is a powerful tool for building web servers to hit API at backend. It has several advantages which makes it popular, however it has got some drawbacks too, for example, one needs to define different routes or middleware to handle different incoming requests from the client.In this article, we will see how to use the next() function in a middleware of Express.js. There are lots of middleware in Express.js. We will use the app.use() middleware to define the handler of the particular request made by client.Syntaxapp.use(path, (req, res, next) )Parameterspath – This is the path for which the middleware ...
Read MoreExpress.js – express.text() function
express.text() is a built-in middleware function in Express. It parses the incoming request payloads into a string and it is based upon the body-parser. This method returns the middleware that parses all the bodies as strings.Syntaxexpress.text([options])ParametersFollowing are the different options available with this methodoptionsinflate – It enables or disables the handling of the deflated or compressed bodies. Default: truelimit – It controls the maximum size of the request body.defaultCharset – This option specifies the default character set for the text content if the charset is not specified in the Content-type header of the request.type – It determines the media type ...
Read MoreExpress.js – express.raw() function
express.raw() is a built-in middleware function in Express. It parses the incoming requests into a buffer and it is based upon the body-parser. This method returns the middleware that parses all JSON bodies as buffer and only looks at the requests where the content-type header matches the type option.Syntaxexpress.raw([options])ParametersFollowing are the different options available with this methodoptions –inflate – This enables or disables the handling of the deflated or compressed bodies. Default: truelimit – Controls the maximum size of the request body.type – Determines the media type for the middleware that will be parsed.Example 1Create a file with the name "expressRaw.js" ...
Read MoreExpress.js – express.json() function
express.json() is a built-in middleware function in Express. This method is used to parse the incoming requests with JSON payloads and is based upon the bodyparser.This method returns the middleware that only parses JSON and only looks at the requests where the content-type header matches the type option.Syntaxexpress.json([options])ParametersFollowing are the different options available with this methodoptionsinflate – This enables or disables the handling of the deflated or compressed bodies. Default: truelimit – This controls the maximum size of the request body.reviver – This option is passed to the JSON.parse method as the second argument.strict – This enables or disables the ...
Read MoreExpress.js – app.set() Method
The app.set() function assigns or sets a setting name to value. This can store any type of value as the user wants, but there are some certain names that can be used to configure the behaviour of the serverSome of the properties that can be configured with the set functionality are −envetagjsonp escape, etcSyntaxapp.set(name, value)Example 1Create a file with the name "appSet.js" and copy the following code snippet. After creating the file, use the command "node appSet.js" to run this code.// app.set() Demo Example // Importing the express module var express = require('express'); // Initializing the express and ...
Read MoreExpress.js – app.route() Method
The app.route() method returns the instance of a single route. This single route can be used to handle the HTTP verbs with the optional middleware. This method is mainly used to avoid duplicate names.Syntaxapp.route( )Example 1Create a file with the name "appRoute.js" and copy the following code snippet. After creating the file, use the command "node appRoute.js" to run this code.// app.route() Demo Example // Importing the express module var express = require('express'); // Initializing the express and port number var app = express(); var PORT = 3000; // Creating a get, post & other requests app.route('/user') ...
Read MoreExpress.js – app.post() Method
The app.post() method routes all the HTTP POST requests to the specified path with the specified callback functions.Syntaxapp.path(path, callback, [callback])Parameterspath − This is the path for which the middleware function is invoked. A path can be a string, path pattern, a regular expression or an array of all these.callback − These are the middleware functions or a series of middleware functions that acts like a middleware except that these callbacks can invoke next (route).Example 1Create a file with the name "appPost.js" and copy the following code snippet. After creating the file, use the command "node appPost.js" to run this code.// ...
Read MoreExpress.js – app.path() Method
The app.path() method returns the canonical path. The path is returned as a string. It is better to use the req.baseUrl method since the app.path() method can be very complicated in complex cases of mounted apps.Syntaxapp.path( )Example 1Create a file with the name "appPath.js" and copy the following code snippet. After creating the file, use the command "node appPath.js" to run this code.// app.path() Demo Example // Importing the express module var express = require('express'); // Initializing the express and port number var app = express(); var PORT = 3000; // Assigning express constructor var app = ...
Read MoreExpress.js – app.param() Method
The app.param() method is basically used for adding the callback triggers to the route parameters, where name represents the name of the parameter or an array of them and callback represents the callback function.Syntaxapp.param([name], callback)Parametersname − Represents the name of the parameter or array of parameters as required.callback − Represents the callback function. The parameters of the callback function include the request object, the response object, the next middleware, the value of the parameter, and the name of the parameter in the same order.ExampleCreate a file with the name "appParam.js" and copy the following code snippet. After creating the file, ...
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