Koa.js Tutorial to Implement Pattern Matching Routes and Query Params Using Regex (Regular Expression) Using koa-router Library in Node.js Full Example For Beginners


Welcome folks today in this blog post we will be implementing pattern matching routes and query params using regex (regular expression) using koa-router library. All the full source code of the application is shown below.



Get Started




In order to get started you need to install the below library using the npm command as shown below


npm i koa-router


After installing this make a index.js file and copy paste the following code






var koa = require('koa');
var router = require('koa-router');
var app = koa();

var _ = router();

_.get('/things/:id([0-9]{5})', sendID);

function *sendID(){
   this.body = 'id: ' + this.params.id;


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