post request express code example

Example 1: express get url parameters

app.get('/path/:name', function(req, res) {
  res.send("tagId is set to " + req.params.name);
});

Example 2: express receive post data

const { id } = req.body;

Example 3: node express post request json

var express = require('express');

var app = express();

app.use(express.json()); // built-in middleware for express

app.post('/', function(request, response){
 	let myJson = request.body;      // your JSON
	let myValue = request.body.myKey;	// a value from your JSON
	response.send(myJson);	 // echo the result back
});

app.listen(3000);

Example 4: node js express url parameters

// http://localhost:8080/api/1
app.get('/api/:version', function(req, res) {
    res.send(req.params.version);
});

Example 5: app.post('/', function (req, res) { res.send('POST request to homepage') })

var express        =         require("express");
var bodyParser     =         require("body-parser");
var app            =         express();

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.get('/',function(req,res){
  res.sendfile("index.html");
});
app.post('/login',function(req,res){
  var user_name=req.body.user;
  var password=req.body.password;
  console.log("User name = "+user_name+", password is "+password);
  res.end("yes");
});
app.listen(3000,function(){
  console.log("Started on PORT 3000");
})

Example 6: app.get

const express = require('express');
const app = express();

const { getElementById, getIndexById, updateElement,
  seedElements, createElement } = require('./utils');

const PORT = process.env.PORT || 4001;
// Use static server to serve the Express Yourself Website
app.use(express.static('public'));

const expressions = [];
seedElements(expressions, 'expressions');
const animals = [];
seedElements(animals, 'animals');

// Get all expressions
app.get('/expressions', (req, res, next) => {
  res.send(expressions);
});

// Get a single expression
app.get('/expressions/:id', (req, res, next) => {
  const foundExpression = getElementById(req.params.id, expressions);
  if (foundExpression) {
    res.send(foundExpression);
  } else {
    res.status(404).send();
  }
});

// Update an expression
app.put('/expressions/:id', (req, res, next) => {
  const expressionIndex = getIndexById(req.params.id, expressions);
  if (expressionIndex !== -1) {
    updateElement(req.params.id, req.query, expressions);
    res.send(expressions[expressionIndex]);
  } else {
    res.status(404).send();
  }
});

// Create an expression
app.post('/expressions', (req, res, next) => {
  const receivedExpression = createElement('expressions', req.query);
  if (receivedExpression) {
    expressions.push(receivedExpression);
    res.status(201).send(receivedExpression);
  } else {
    res.status(400).send();
  }
});

// Delete an expression
app.delete('/expressions/:id', (req, res, next) => {
  const expressionIndex = getIndexById(req.params.id, expressions);
  if (expressionIndex !== -1) {
    expressions.splice(expressionIndex, 1);
    res.status(204).send();
  } else {
    res.status(404).send();
  }
});

// Get all animals
app.get('/animals', (req, res, next) => {
  res.send(animals);
});

// Get a single animal
app.get('/animals/:id', (req, res, next) => {
  const animal = getElementById(req.params.id, animals);
  if (animal) {
    res.send(animal);
  } else {
    res.status(404).send();
  }
});

// Create an animal
app.post('/animals', (req, res, next) => {
  const receivedAnimal = createElement('animals', req.query);
  if (receivedAnimal) {
    animals.push(receivedAnimal);
    res.status(201).send(receivedAnimal);
  } else {
    res.status(400).send();
  }
});

// Update an animal
app.put('/animals/:id', (req, res, next) => {
  const animalIndex = getIndexById(req.params.id, animals);
  if (animalIndex !== -1) {
    updateElement(req.params.id, req.query, animals);
    res.send(animals[animalIndex]);
  } else {
    res.status(404).send();
  }
});

// Delete a single animal
app.delete('/animals/:id', (req, res, next) => {
  const animalIndex = getIndexById(req.params.id, animals);
  if (animalIndex !== -1) {
    animals.splice(animalIndex, 1);
    res.status(204).send();
  } else {
    res.status(404).send();
  }
});

app.listen(PORT, () => {
  console.log(`Server is listening on ${PORT}`);
});