TypeError Router use requires middleware function but got a Object

Question

There have been some middleware changes on the new version of express and I have made some changes in my code around some of the other posts on this issue but I can t get anything to stick   We had it working before hand but I can t remember what the change was    throw new TypeError  Router use   requires middleware function but got a           TypeError  Router use   requires middleware function but got a Object     node   bin www  js-bson  Failed to load c   bson extension  using pure JS version js-bson  Failed to load c   bson extension  using pure JS version      Users datis Documents bb-dashboard node modules express lib router index js 438       throw new TypeError  Router use   requires middleware function but got a               TypeError  Router use   requires middleware function but got a Object     at  Users datis Documents bb-dashboard node modules express lib router index js 438 13     at Array forEach  native      at Function use   Users datis Documents bb-dashboard node modules express lib router index js 436 13      at  Users datis Documents bb-dashboard node modules express lib application js 188 21     at Array forEach  native      at Function use   Users datis Documents bb-dashboard node modules express lib application js 185 7      at Object  lt anonymous gt    Users datis Documents bb-dashboard app js 46 5      at Module  compile  module js 456 26      at Object Module  extensions  js  module js 474 10      at Module load  module js 356 32    app js  var express   require  express    var path   require  path    var favicon   require  serve-favicon    var logger   require  morgan    var cookieParser   require  cookie-parser    var bodyParser   require  body-parser    var mongoose   require  mongoose    var session   require  express-session    var MongoClient   require  mongodb   MongoClient  var routes   require    routes index    var users   require    routes users     var Users   require    models user    var Items   require    models item    var Store   require    models store    var StoreItem   require    models storeitem     var app   express      set mongo db connection var db   mongoose connection    MongoClient connect  mongodb   localhost 27017 test   function err  db      if  err        console log  We are connected               var MONGOHQ URL  mongodb   localhost 27017 test       view engine setup app set  views   path join   dirname   views      app set  view engine    ejs        uncomment after placing your favicon in  public   app use favicon   dirname     public favicon ico     app use logger  dev     app use bodyParser json     app use bodyParser urlencoded   extended  false      app use cookieParser     app use session       secret   something       resave  true      saveUninitialized  true       app use      routes   app use   users   users   app use express static path join   dirname   public          catch 404 and forward to error handler    app use function req  res  next           var err   new Error  Not Found           err status   404         next err              Make our db accessible to our router app use function req  res  next     req db   db    next            error handlers     development error handler    will print stacktrace if  app get  env        development         app use function err  req  res  next            res status err status    500           res render  error                 message  err message              error  err                           production error handler    no stacktraces leaked to user app use function err  req  res  next        res status err status    500       res render  error             message  err message          error                   module exports   app      It appears the answer to this question has changed for versioning reasons  Thanks to Nik

User · Answer

In any one of your js pages you are missing   module exports   router    Check and verify all your JS pages

User · Answer

If your are using express above 2 x  you have to declare app router like below code  Please try to replace your code app use      routes    with app use app router   routes initialize app    Please click here to get more details about app router Note  app router is depreciated in express 3 0    If you are using express 3 0   refer to Anirudh s answer below

User · Answer

I had this error and solution help which was posted by Anirudh  I built a template for express routing and forgot about this nuance - glad it was an easy fix    I wanted to give a little clarification to his answer on where to put this code by explaining my file structure    My typical file structure is as follows    lib   routes   ---index js  controls the main navigation    page-one     page-two         ---index js    each file  in my case the index js within page-two  although page-one would have an index js too - for each page - that uses app METHOD or router METHOD needs to have module exports   router  at the end    If someone wants I will post a link to github template that implements express routing using best practices  let me know  Thanks Anirudh    for the great answer

User · Answer

Check your all these file   var users   require    routes users     var Users   require    models user    var Items   require    models item      Save properly  In my case  one file was missed and throwing the same error

User · Answer

check your routes js file   example my routes js   x000D   x000D      const express   require  express   x000D      const router   express Router   x000D       x000D      const usersController   require     app controllers usersController   x000D      const autheticateuser   require     app middlewares authentication   x000D       x000D      router post   users login   autheticateuser  usersController login  x000D      router post   users register   autheticateuser  usersController register  x000D         x000D   x000D   x000D    check end of routes js  module exports   router   if not there add and module exports   router run again        If your Error is    TypeError   Route post    or  Route get     requires middleware function but got a Object    goto controller js  i e   usersController   and check all the function names you might misspelled   or you given in function routes file but missed in contollers   x000D   x000D  const User   require     models user   x000D  const express   require  express   x000D  const router   express Router   x000D   x000D   x000D   x000D  module exports register    req  res    gt    x000D      const data   req body x000D      const user   new User data  x000D      user save   x000D           then  user    gt    x000D              res send user  x000D             x000D           catch  err    gt    x000D              res json err  x000D             x000D    x000D   x000D   x000D    in routes js i given two routes but in controllers i missed to define route for   router post   users login    this will make error      TypeError  route post   requires middleware function but got a Object

User · Answer

You are missing router exports module and that is the reason why this error is present  use module exports   router  and that would work

User · Answer

Simple solution if your are using express and doing   const router   express Router      make sure to   module exports   router     at the end of your page

User · Answer

In my case i wasn t exporting the module  module exports   router

User · Answer

I was getting the same error message but had a different issue  Posting for others that are stuck on same    I ported the get  post  put  delete functions to new router file while refactoring  and forgot to edit the paths  Example   Incorrect     server js app use   blog-posts   blogPostsRouter      routers blogPostsRouter js router get   blog-posts    req  res    gt      res json BlogPosts get           Correct     server js app use   blog-posts   blogPostsRouter      routers blogPostsRouter js router get       req  res    gt      res json BlogPosts get           Took a while to spot  as the error had me checking syntax where I might have been wrapping an argument in an object or where I missed the module exports   router

[javascript] TypeError: Router.use() requires middleware function but got a Object

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