快速路线中的捕获错误不起作用

Question

I am working in node.js to create API it's function as follow This API will be used to send images from Images folder then store the image name which has been sent to the images_thumb folder after resizing the image with Sharp if the server got request for any image which has been sent before the API shall send the image from Images_thumb folder ----Proplem When ever I open the browser to http://localhost:3000/?name=6 (6 is an image name not exists in the images folder for example) the image name is added to visited array and i donot know how to send res.send("file not found")

const express = require("express");
const sharp = require("sharp");
const app = express();

let visited = []; // This array is used to sore file names for comparison later
let found; // Boolean to be true if the file name exists in Visited Array

app.get("/", (req, res) => {
    if (visited.length == 0 ) { // is the server just started 

        console.log(typeof res.statusCode);
        sharp(__dirname + "\\images\\" + req.query.name + ".jpg") // sharp is used to resize the image and save the resized version in the Images_thumb folder
            .resize(200,200)
            .toFile(__dirname + "\\images_thumb\\" + req.query.name + ".jpg")
            .then(console.log("done")).catch((err)=>{
                res.send('Not found');
                console.log(err);
            })
        res.sendFile(__dirname + "\\images\\" + req.query.name + ".jpg");
        visited.push(req.query.name);
        console.log("initial length 0");

    } else if (visited.length > 0) {
    
        for (let index = 0; index <= visited.length; index++) { // used to chek if file name existis in the array Visited
            const element = visited[index];
            console.log(index + "loop");
            if (element === req.query.name && res.statusCode==200) {
    
                res.sendFile(__dirname + "\\images_thumb\\" + req.query.name + ".jpg");
                console.log(index + "break");
                found = true;
                //res.send(index+"break")
                break;
            } else {
   
                console.log("false");
                found = false;
            }
        }
    } else {
    }

    if (visited.length > 0 && found == false ) { // used if file name not in Array visited and Array length >0
        sharp(__dirname + "\\images\\" + req.query.name + ".jpg")
            .resize(200,200)
            .toFile(__dirname + "\\images_thumb\\" + req.query.name + ".jpg")
            .then(console.log("done")).catch((err)=>{
                res.send('Not found');
                console.log(err);
            });
   
        res.sendFile(__dirname + "\\images\\" + req.query.name + ".jpg");
        visited.push(req.query.name);
        console.log(visited);
    };

    // res.sendFile(__dirname + "\\images_thumb\\" + req.query.name + ".jpg");
});

app.listen(3000, function () {
   console.log("running");
});

the file structiure as follow main folder inside is images and images_thumb folder with server.js

Answer 1

Try to console.log this: __dirname + "\\images\\" + req.query.name + ".jpg" , and see the path, probably is not correct.