diff --git a/rootfs_overlay/lkmc/nodejs/express.js b/rootfs_overlay/lkmc/nodejs/express.js
deleted file mode 100755
index dac53c3f..00000000
--- a/rootfs_overlay/lkmc/nodejs/express.js
+++ /dev/null
@@ -1,86 +0,0 @@
-#!/usr/bin/env node
-
-const express = require('express')
-
-function check_helper(req, res) {
-  if (req.params.param.length > 2) {
-    res.status(404)
-    res.send('ko')
-  } else {
-    return req.params.param + 'ok'
-  }
-}
-
-const app = express()
-app.get('/', (req, res) => {
-  res.send('hello world')
-})
-app.get('/check-helper-1/:param', (req, res) => {
-  const ret = check_helper(req, res)
-  if (ret) {
-    res.send(ret)
-  }
-})
-app.get('/check-helper-2/:param', (req, res) => {
-  const ret = check_helper(req, res)
-  if (ret) {
-    res.send(ret)
-  }
-})
-app.get('/error', async (req, res, next) => {
-  try {
-    throw 'my error'
-    res.send('never returned')
-  } catch(error) {
-    next(error);
-  }
-})
-app.get('/query', (req, res) => {
-  res.send(`aa: ${req.query.aa} bb: ${req.query.bb}`)
-})
-app.get('/splat/:splat(*)', (req, res) => {
-  res.send('splat ' + req.params.splat)
-})
-const server = app.listen(3000, () => {
-  console.log(`listening: http://localhost:${server.address().port}`)
-
-  // Test it.
-  function test(path, method, status, body) {
-    const assert = require('assert')
-    const http = require('http')
-    const options = {
-      hostname: 'localhost',
-      port: server.address().port,
-      path: path,
-      method: method,
-    }
-    http.request(options, res => {
-      assert.strictEqual(res.statusCode, status);
-      res.on('data', d => {
-        if (body !== undefined) {
-          assert.strictEqual(d.toString(), body);
-        }
-      })
-    }).end()
-  }
-  test('/', 'GET', 200, 'hello world')
-  test('/', 'POST', 404)
-  test('/dontexist', 'GET', 404)
-
-  // Shows 'my error' on terminal, without stack trace.
-  test('/error', 'GET', 500)
-
-  test('/query?aa=000&bb=111', 'GET', 200, 'aa: 000 bb: 111')
-
-  // https://stackoverflow.com/questions/10020099/express-js-routing-optional-splat-param
-  // https://stackoverflow.com/questions/16829803/express-js-route-parameter-with-slashes
-  // https://stackoverflow.com/questions/34571784/how-to-use-parameters-containing-a-slash-character
-  test('/splat/aaa', 'GET', 200, 'splat aaa')
-  test('/splat/aaa/bbb', 'GET', 200, 'splat aaa/bbb')
-  test('/splat/aaa/bbb/ccc', 'GET', 200, 'splat aaa/bbb/ccc')
-
-  test('/check-helper-1/aa', 'GET', 200, 'aaok')
-  test('/check-helper-2/bb', 'GET', 200, 'bbok')
-  test('/check-helper-1/ccc', 'GET', 404, 'ko')
-  test('/check-helper-2/ddd', 'GET', 404, 'ko')
-})
diff --git a/rootfs_overlay/lkmc/nodejs/worker_threads_test.js b/rootfs_overlay/lkmc/nodejs/worker_threads_test.js
index a606e767..b2554adb 100755
--- a/rootfs_overlay/lkmc/nodejs/worker_threads_test.js
+++ b/rootfs_overlay/lkmc/nodejs/worker_threads_test.js
@@ -25,7 +25,7 @@ function generatePrimes(start, range) {
 if (isMainThread) {
   const max = 1e2;
   const threadCount = +process.argv[2] || 10;
-  const threads = new Set();;
+  const threads = new Set();
   const range = Math.ceil((max - min) / threadCount);
   let start = min;
   for (let i = 0; i < threadCount - 1; i++) {