pgadmin 4 v4.28 keeps loading - pgadmin-4

Question

I installed pgadmin 4 v4.28 and it keeps loading but does not open, I tried opening it as administrator and it still does not open. I had the older version previously but I have deleted PostgreSQL DB and pg admin properly before I install the above version. can you guys help me out on this? the link I have the screenshot of the problem.

Answer 1

Do the following steps to resolve this:
Open your registry editor.
Change the value of HKEY_CLASSES_ROOT\.js\Content Type from text/plain to text/javascript.
Restart the pgadmin server. You can do this by ending the pgadmin background task from the task manager.

Answer 2

UPDATED ANSWER
PGAdmin has been tracking this as bug 5996. In it, they recommend the following solution:
You can add the following lines to the "config_distro.py" and
restart the pgAdmin 4 server:
import mimetypes
mimetypes.add_type('text/javascript', '.js')
The above workaround should work for you.
They also mention:
In the next release, we're looking to include that into the code, so
users don't have to do it themselves.
But the answer to your question, the config_distro.py can be overwritten
in the subsequent upgrades.
pgAdmin does provide another option to set the settings in the
config_system.py file which is intended for system administrator to
include settings and which is outside of the pgAdmin installation.
Please refer https://www.pgadmin.org/docs/pgadmin4/4.28/config_py.html
for more details.
PREVIOUS ANSWER
Another answer had comments asking what caused this/how the author figured it out.
For posterity, this is documented in the FAQ:
When I launch pgAdmin 4 v4.28 or later on Windows, the loading page
never closes. Why?
pgAdmin 4 v4.28 includes additional security features, one of which is
intended to prevent security issues caused by Content Sniffing.
Unfortunately some Windows systems are misconfigured such that this
causes Javascripts used by pgAdmin to fail to load. Opening the
developer tools on your browser will show an error similar to this:
> Refused to execute script from
> 'http://127.0.0.1:57313/static/vendor/require/require.min.js?ver=42800'
> because its MIME type ('text/plain') is not executable, and strict
> MIME type checking is enabled.
>
> (index):39 Uncaught ReferenceError: require is not defined at
> (index):39
This will occur when the value of the registry key at
HKEY_CLASSES_ROOT\.js\Content Type is set to text/plain. To resolve
the issue, use the Registry Editor and reset the value of
HKEY_CLASSES_ROOT\.js\Content Type to:
text/javascript
Finally, restart the pgAdmin server.
Interestingly enough, GoLang, TensorBoard, Django, and many others have had issues filed regarding this same problem. Browsers are refusing to load content because the browser thinks it is being transferred as 'text/plain', based on the registry configuration.

Answer 3

Edited on 25 May 2022 (New Link for pgadmin4 download)
You all have great answers...but then on the experience i just had, the simplest way, which worked for me right away is to install the new version of pgadmin4 without necessarily uninstall the existing one.
That is what i did and i was able to still see all my databases and tables unchanged and untempered.
Just run the installation and you are good to go

Answer 4

You can also downgrade your PgAdmin. I didn't want to change anything in registry editor. So I downloaded and installed pgadmin4-3.6. It works fine on Windows 10 (x64).

Answer 5

I just upgraded PG Admin from v4.28 to V4.29 and it resolved my issue. One can download the latest version from here for Linux, here for Windows and here for Mac.
This is similar to vialy's recomendation. Thanks Vialy's for your input it save my day... :)

Answer 6

I had the same issue with pgAdmin 4.28 using Chrome Browser on windows 10. It started working after I switched to Edge Browser.