diff --git a/lib/web/middleware/checkURIValid.js b/lib/web/middleware/checkURIValid.js
deleted file mode 100644
index cd6dabd2f..000000000
--- a/lib/web/middleware/checkURIValid.js
+++ /dev/null
@@ -1,14 +0,0 @@
-'use strict'
-
-const logger = require('../../logger')
-const errors = require('../../errors')
-
-module.exports = function (req, res, next) {
-  try {
-    decodeURIComponent(req.path)
-  } catch (err) {
-    logger.error(err)
-    return errors.errorBadRequest(res)
-  }
-  next()
-}
diff --git a/lib/web/middleware/checkURIValid.ts b/lib/web/middleware/checkURIValid.ts
new file mode 100644
index 000000000..3a08e8ad7
--- /dev/null
+++ b/lib/web/middleware/checkURIValid.ts
@@ -0,0 +1,13 @@
+import { logger } from '../../logger'
+import { errors } from '../../errors'
+import { NextFunction, Request, Response } from 'express'
+
+export default function checkURI (req: Request, res: Response, next: NextFunction) {
+  try {
+    decodeURIComponent(req.path)
+    next()
+  } catch (err) {
+    logger.error(err)
+    errors.errorBadRequest(res)
+  }
+}
diff --git a/lib/web/middleware/codiMDVersion.js b/lib/web/middleware/codiMDVersion.js
deleted file mode 100644
index e7775876f..000000000
--- a/lib/web/middleware/codiMDVersion.js
+++ /dev/null
@@ -1,10 +0,0 @@
-'use strict'
-
-const config = require('../../config')
-
-module.exports = function (req, res, next) {
-  res.set({
-    'CodiMD-Version': config.version
-  })
-  return next()
-}
diff --git a/lib/web/middleware/codiMDVersion.ts b/lib/web/middleware/codiMDVersion.ts
new file mode 100644
index 000000000..3aea95bb9
--- /dev/null
+++ b/lib/web/middleware/codiMDVersion.ts
@@ -0,0 +1,9 @@
+import { config } from '../../config'
+import { NextFunction, Request, Response } from 'express'
+
+export default function version (req: Request, res: Response, next: NextFunction) {
+  res.set({
+    'CodiMD-Version': config.version
+  })
+  return next()
+}
diff --git a/lib/web/middleware/redirectWithoutTrailingSlashes.js b/lib/web/middleware/redirectWithoutTrailingSlashes.js
deleted file mode 100644
index 60ca04afc..000000000
--- a/lib/web/middleware/redirectWithoutTrailingSlashes.js
+++ /dev/null
@@ -1,17 +0,0 @@
-'use strict'
-
-const config = require('../../config')
-
-module.exports = function (req, res, next) {
-  if (req.method === 'GET' && req.path.substr(-1) === '/' && req.path.length > 1) {
-    const queryString = req.url.slice(req.path.length)
-    const urlPath = req.path.slice(0, -1)
-    let serverURL = config.serverURL
-    if (config.urlPath) {
-      serverURL = serverURL.slice(0, -(config.urlPath.length + 1))
-    }
-    res.redirect(301, serverURL + urlPath + queryString)
-  } else {
-    next()
-  }
-}
diff --git a/lib/web/middleware/redirectWithoutTrailingSlashes.ts b/lib/web/middleware/redirectWithoutTrailingSlashes.ts
new file mode 100644
index 000000000..6b71f0c23
--- /dev/null
+++ b/lib/web/middleware/redirectWithoutTrailingSlashes.ts
@@ -0,0 +1,16 @@
+import { NextFunction, Request, Response } from 'express'
+import { config } from '../../config'
+
+export default function (req: Request, res: Response, next: NextFunction): void {
+  if (req.method === 'GET' && req.path.substr(-1) === '/' && req.path.length > 1) {
+    const queryString: string = req.url.slice(req.path.length)
+    const urlPath: string = req.path.slice(0, -1)
+    let serverURL: string = config.serverURL
+    if (config.urlPath) {
+      serverURL = serverURL.slice(0, -(config.urlPath.length + 1))
+    }
+    res.redirect(301, serverURL + urlPath + queryString)
+  } else {
+    next()
+  }
+}
diff --git a/lib/web/middleware/tooBusy.js b/lib/web/middleware/tooBusy.js
deleted file mode 100644
index a2101975a..000000000
--- a/lib/web/middleware/tooBusy.js
+++ /dev/null
@@ -1,16 +0,0 @@
-'use strict'
-
-const toobusy = require('toobusy-js')
-
-const errors = require('../../errors')
-const config = require('../../config')
-
-toobusy.maxLag(config.tooBusyLag)
-
-module.exports = function (req, res, next) {
-  if (toobusy()) {
-    errors.errorServiceUnavailable(res)
-  } else {
-    next()
-  }
-}
diff --git a/lib/web/middleware/tooBusy.ts b/lib/web/middleware/tooBusy.ts
new file mode 100644
index 000000000..06768cf3c
--- /dev/null
+++ b/lib/web/middleware/tooBusy.ts
@@ -0,0 +1,14 @@
+import toobusy from 'toobusy-js'
+import { errors } from '../../errors'
+import { config } from '../../config'
+import { NextFunction, Request, Response } from 'express'
+
+toobusy.maxLag(config.tooBusyLag)
+
+export default function tooBusy (req: Request, res: Response, next: NextFunction): void {
+  if (toobusy()) {
+    errors.errorServiceUnavailable(res)
+  } else {
+    next()
+  }
+}