What is req.query in Express.js?
req.query is a request object that is populated by request query strings that are found in a URL. These query strings are in key-value form. They start after the
Example
https://educative.io/user?name=Theodore&isAuthor=true
From the above code, the query strings are name and isAuthor. When this request is made, the req.query object becomes populated with the query strings.
req.query = {name: "Theodore", isAuthor: true}
How to use expressJs
- Create an application and start the server.
var express = require('express');var app = express();const PORT = 3000;app.listen(PORT, ()=>{console.log("app running on port "+PORT);})
- Set up the route for our request.
app.get("/user", (req, res)=>{var name = req.query.name;var isAuthor = req.query.isAuthor;res.json({name,isAuthor})})
- Open your browser and request the route
/user?name=Theodore&isAuthor=true".
This will return a JSON object with the following result.
{
"name": "Theodore",
"isAuthor": "true"
}
Thanks for reading!
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