Malformed URI when encrypting string using md5

[titan1230]

Kindly, help me solve this error of Malformed URI when encrypting string using md5.

The error is:

URIError: URI malformed
    at decodeURIComponent (<anonymous>)
    at Object.util.decodeUtf8 (/home/pi/Projects/scratcher/node_modules/node-forge/lib/util.js:1671:10)
    at ByteStringBuffer.util.ByteStringBuffer.toString (/home/pi/Projects/scratcher/node_modules/node-forge/lib/util.js:716:15)
    at /home/pi/Projects/scratcher/src/routes/offerwall/index.ts:32:99
    at Generator.next (<anonymous>)
    at /home/pi/Projects/scratcher/src/routes/offerwall/index.ts:8:71
    at new Promise (<anonymous>)
    at __awaiter (/home/pi/Projects/scratcher/src/routes/offerwall/index.ts:4:12)
    at /home/pi/Projects/scratcher/src/routes/offerwall/index.ts:12:36
    at Layer.handle [as handle_request] (/home/pi/Projects/scratcher/node_modules/express/lib/router/layer.js:95:5)

The code is:

import { md5 } from "node-forge";

const sub_id = encodeURIComponent(req.query.sub_id!.toString());
const amount = encodeURIComponent(req.query.amount!.toString());
const signature = req.query.signature!.toString();

const secret_key = encodeURIComponent(process.env.SECRET_KEY!);

if (!amount || !sub_id || !signature) {
        res.send("0");
        return;
}
    
let conn;
const md = md5.create()
const validation_signature = md.update(sub_id + ":" + amount + ":" + secret_key).digest().toString();

Your help would be greatly appreciated.

[titan1230]

@siebertm @shellac @cadorn @andersk , Kindly help if you know the solution.