GET http://localhost:3000/node_modules/mathjs net::ERR_ABORTED 404 (Not Found)

I tried to link mathjs to my script but got this error:

GET http://localhost:3000/node_modules/mathjs net::ERR_ABORTED 404 (Not Found)

I use local node server

Server code:

const http = require("http");
const fs = require("fs");
   
http.createServer(function(request, response){
       
    let filePath = request.url.substring(1);
    if(filePath == "") filePath = "index.html"; 
    fs.readFile(filePath, function(error, data){
               
        if(error){
            response.statusCode = 404;
            response.end("Resourse not found!");
        }   
        else{
            if(filePath.endsWith(".js")) response.setHeader("Content-Type", "text/javascript");
            response.end(data);
        }
    });
}).listen(3000, function(){
    console.log("Server started at 3000");
});

My project strucutre:

Project structure

I tried to correct path, but this didn’t help (path was correct?)
import {evaluate} from './node_modules/mathjs';