Postman 404 not found app.js:30:8

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I run a POST request in POSTMAN ({{URL}}/api/roles/add) and get a 404 error. How do you fix not found error?

app.js

if (process.env.NODE_ENV != "production") require("dotenv").config();

var createError = require("http-errors");
var express = require("express");
var path = require("path");
var cookieParser = require("cookie-parser");
var logger = require("morgan");

var app = express();

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "ejs");

app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));

app.use((req, res, next) => {
  console.log("Ben app.js te tanımlanan bir middleware'im");
  next();
});

app.use("/api", require("./routes/index"));

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get("env") === "development" ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render("error");
});

module.exports = app;

index.js

var express = require("express");
var router = express.Router();

const fs = require("fs");

let routes = fs.readdirSync(__dirname);

for (let route of routes) {
  if (route.includes(".js") && route != "index.js") {
    router.use("/" + route.replace(".js", ""), require("./" + route));
  }
}

module.exports = router;

My Error

<h1>Not Found</h1>
<h2>404</h2>
<pre>NotFoundError: Not Found
    at /home/azad/Masaüstü/project-nodejs-base/api/app.js:30:8

My app.js:30:8 ->> // catch 404 and forward to error handler
app.use(function (req, res, next) {
next(createError(404));
});

2

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