Chrome dev tools fails to show response even the content returned has header Content-Type text html charset UTF-8

Question

Why does my chrome developer tools show  Failed to show response data  in response when the content returned is of type text html   What is the alternative to see the returned response in developer tools

User · Answer

For the ones who are getting the error while requesting JSON data   If your are requesting JSON data  the JSON might be too large and that what cause the error to happen   My solution is to copy the request link to new tab  get request from browser  copy the data to JSON viewer online where you have auto parsing and work on it there

User · Answer

As described by Gideon  this is a known issue with Chrome that has been open for more than 5 years with no apparent interest in fixing it   Unfortunately  in my case  the window onunload   function     debugger    workaround didn t work either  So far the best workaround I ve found is to use Firefox  which does display response data even after a navigation  The Firefox devtools also have a lot of nice features missing in Chrome  such as syntax highlighting the response data if it is html and automatically parsing it if it is JSON

User · Answer

another possibility is that the server does not handle the OPTIONS request

User · Answer

Bug still active  This happens when JS becomes the initiator for new page 200   or redirect 301 302  1 possible way to fix it - it disable JavaScript on request  I e  in puppeteer you can use  page setJavaScriptEnabled false  while intercepting request page on  request

User · Answer

I think this only happens when you have  Preserve log  checked and you are trying to view the response data of a previous request after you have navigated away    For example  I viewed the Response to loading this Stack Overflow question  You can see  it     The second time  I reloaded this page but didn t look at the Headers or Response  I navigated to a different website  Now when I look at the response  it shows  Failed to load response data      This is a known issue  that s been around for a while  and debated a lot  However  there is a workaround  in which you pause on onunload  so you can view the response before it navigates away  and thereby doesn t lose the data upon navigating away   window onunload   function     debugger

User · Answer

For those coming here from Google  and for whom the previous answers do not solve the mystery    If you use XHR to make a server call  but do not return a response  this error will occur  Example  from Nodejs React but could equally be js php   App tsx const handleClickEvent        gt        fetch   routeInAppjs someVar someValue amp nutherVar summat else             method   GET           mode   same-origin           credentials   include           headers               content-type    application json             dataType   json                     then  response    gt            console log response             App js app route   getAllPublicDatasheets   get async function  req  res        const   someVar  nutherVar     req query      console log  Ending here without a return           Console log will here report  Failed to show response data  To fix  add the return response to bottom of your route  server-side   res json  Adding this below the console log in App js route will solve it

User · Answer

For me  the issue happens when the returned JSON file is too large  If you just want to see the response  you can get it with the help of Postman  See the steps below   Copy the request with all information including URL  header  token  etc  from chrome debugger through Chrome Developer Tools- gt Network Tab- gt find the request- gt right click on it- gt Copy- gt Copy as cURL  Open postman  import- gt Rawtext  paste the content  Postman will recreate the same request  Then run the request you should see the JSON response   Import cURL in postmain  1   https   i stack imgur com dL9Qo png  If you want to reduce the size of the API response  maybe you can return fewer fields in the response  For mongoose  you can easily do this by providing a field name list when calling the find   method  For exmaple  convert the method from  const users   await User find   lean     To  const users   await User find       id username email role timecreated   lean     In my case  there is field called description  which is a large string  After removing it from the field list  the response size is reduced from 6 6 MB to 404 KB

User · Answer

For the once who receive this error while requesting large JSON data it is  as mentioned by Blauhirn  not a solution to just open the request in new tab if you are using authentication headers and suchlike   Forturnatly chrome does have other options such as Copy -  Copy as curl  Running this call from the commandoline through cURL will be a exact replicate of the original call   I added  gt    result json to the last part of the commando to save the result to a file  Otherwise it will be outputted to the console

User · Answer

As described by Gideon  this is a known issue  For use window onunload   function     debugger    instead  But you can add a breakpoint in Source tab  then can solve your problem  like this

User · Answer

Failed to show response data  can also happen if you are doing crossdomain requests and the remote host is not properly handling the CORS headers   Check your js console for errors

User · Answer

If you make an AJAX request with fetch  the response isn t shown unless it s read with  text     json    etc   If you just do    r   fetch   some-path      the response won t be shown in dev tools  It shows up after you run   r then r   gt  r text

User · Answer

One workaround is to use Postman with same request url  headers and payload  It will give response for sure

[google-chrome] Chrome dev tools fails to show response even the content returned has header Content-Type:text/html; charset=UTF-8

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