How to solve the problem with the execution of the node.js script?

Question

Node.js

Hello everyone, I'm new to JS, familiar with the syntax since yesterday. I'm trying to start a server that will encrypt the text sent to it by a post request, but I ran into an error:

TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received undefined
    at Function.from (buffer.js:333:9)
    at c:\Users\artur\Desktop\Coding\server for naga.com\app.js:6:25
    at Layer.handle [as handle_request] (c:\Users\artur\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (c:\Users\artur\node_modules\express\lib\router\index.js:317:13)
    at c:\Users\artur\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (c:\Users\artur\node_modules\express\lib\router\index.js:335:12)
    at next (c:\Users\artur\node_modules\express\lib\router\index.js:275:10)
    at expressInit (c:\Users\artur\node_modules\express\lib\middleware\init.js:40:5)
    at Layer.handle [as handle_request] (c:\Users\artur\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (c:\Users\artur\node_modules\express\lib\router\index.js:317:13)

Script code:

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

app.use("/generate", function(request, response){
const password = Buffer.from(request.query.password, 'base64');

const hash = crypto.createHash('sha256')
.update("$2a$10$0.o/S/w/i/p/e/S/A/L/T/"+password)
.digest('base64');
response.end('HASH:'+ hash + ';')
});
app.listen(5555);

Due to ignorance of the language, I ask for help from those who know.