CODEWITHSUNDEEP
javascriptnode.jsexpress
Jeyam Thillai
Jeyam Thillai

Reputation: 91

How to pass value in post method?

I am trying to download a file from the folder using nodejs. Everything works fine while using get method. But when i am trying to send file name as parameter in post method it shows "undefined".

var download =req.body.download;

app.post("/hi", function (req, res)
 {
    res.download("./uploads/"+download+"");
});

download is my parameter where i will pass file name

Upvotes: 0

Views: 2035

Answers (2)

ThanhEngineer
ThanhEngineer

Reputation: 1339

You should use middle-ware body-parser to parse parameters from request body and get it inside scope of your POST handler. To install body-parser module:

npm install body-parser --save

Update your code like below:

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

//Here we are configuring express to use body-parser as middle-ware
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.post("/hi", function (req, res) {
    var download = req.body.download;
    res.download("./uploads/"+download+"");
});

And make a call to POST /hi with body json:

{
   "download": "test"
}

UPDATED:

From Express 3, body-parser middleware is attached (built-in) in express. So don't need to install it any more, just need to declare using module as code below:

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

For reference: Express middleware

Upvotes: 5

Peter Keller
Peter Keller

Reputation: 1

Or you could pass params like this:

app.post("/hi/:download", function (req, res) {
    var download = req.params.download;
    res.download("./uploads/"+download+"");
});

And it doesn't even have to be a POST request anymore, you can just use a GET request. Also you can ditch body-parser with this method.

Upvotes: 0

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