How to programmatically send a 404 response with Express Node

Question

I want to simulate a 404 error on my Express Node server  How can I do that

User · Answer

IMO the nicest way is to use the next   function   router get      function req  res  next        var err   new Error  Not found        err status   404      return next err       Then the error is handled by your error handler and you can style the error nicely using HTML

User · Answer

Since Express 4 0  there s a dedicated sendStatus function  res sendStatus 404     If you re using an earlier version of Express  use the status function instead  res status 404  send  Not found

User · Answer

You don t have to simulate it  The second argument to res send I believe is the status code  Just pass 404 to that argument   Let me clarify that  Per the documentation on expressjs org it seems as though any number passed to res send   will be interpreted as the status code  So technically you could get away with   res send 404     Edit  My bad  I meant res instead of req  It should be called on the response   Edit  As of Express 4  the send status  method has been deprecated  If you re using Express 4 or later  use  res sendStatus 404  instead   Thanks  badcc for the tip in the comments

User · Answer

From the Express site  define a NotFound exception and throw it whenever you want to have a 404 page OR redirect to  404 in the below case   function NotFound msg     this name    NotFound     Error call this  msg     Error captureStackTrace this  arguments callee      NotFound prototype   proto     Error prototype   app get   404   function req  res     throw new NotFound       app get   500   function req  res     throw new Error  keyboard cat

User · Answer

According to the site I ll post below  it s all how you set up your server  One example they show is this   var http   require  http    var url   require  url     function start route  handle      function onRequest request  response        var pathname   url parse request url  pathname      console log  Request for     pathname     received          route handle  pathname  response          http createServer onRequest  listen 8888     console log  Server has started        exports start   start    and their route function   function route handle  pathname  response      console log  About to route a request for     pathname     if  typeof handle pathname       function         handle pathname  response       else       console log  No request handler found for     pathname       response writeHead 404    Content-Type    text plain         response write  404 Not found        response end           exports route   route    This is one way  http   www nodebeginner org   From another site  they create a page and then load it  This might be more of what you re looking for   fs readFile  www 404 html   function error2  data                response writeHead 404    content-type    text html                 response end data                 http   blog poweredbyalt net  p 81

User · Answer

Updated Answer for Express 4 x  Rather than using res send 404  as in old versions of Express  the new method is   res sendStatus 404     Express will send a very basic 404 response with  Not Found  text   HTTP 1 1 404 Not Found X-Powered-By  Express Vary  Origin Content-Type  text plain  charset utf-8 Content-Length  9 ETag  W  9-nR6tc Z4 i9RpwqTOwvwFw  Date  Fri  23 Oct 2015 20 08 19 GMT Connection  keep-alive  Not Found

[javascript] How to programmatically send a 404 response with Express/Node?

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