How to resolve the Could not open Postman error?

1. Restart the app
2. Update the app
3. Clear your Postman local data 
4. Further troubleshooting for Windows users

Restart the app

1. Quit the app.
2. Clean up all processes of the app.
   macOS and Linux: Run the command killall Postman in the terminal
   Windows: Open the task manager (Press Ctrl + Shift + Esc) and end all processes named Postman.
3. Restart the app.

Update the app

1. Quit the app.
2. Clean up all processes of the app.
   macOS and Linux: run the command killall Postman in the terminal
   Windows: Open the task manager (Press Ctrl + Shift + Esc) and end all processes named Postman.
3. Download the latest version of the app here.

Clear your Postman local data

If the troubleshooting methods explained above didn’t unblock you, then try deleting your Postman installation local files.

Please note that removing the local files will permanently delete all your local Postman data. The next resolution steps you should take will depend on whether you have a Postman account registered or not. 

• You have a Postman account. Make sure your work is synced to your Postman account. To do so, go to this page and check that your data is synced to your Postman account. You can also check your Activity Feed to make sure recent changes have been captured.
  If your work is synced, then proceed with the resolution steps to remove your local data.

• You are using Postman locally without any Postman account. Do not delete your local data and go to the resolution steps to rename your Postman folder. 

Resolution steps to remove your local data

1. Force quit all open instances of the app. 
   macOS: Opt + Cmd + Esc
   Windows: Ctrl + Alt + Del

2. Uninstall Postman (Windows users only)

3. Delete the Postman folder(s), found at the below locations depending on your operating system. 

   macOS: go to Finder (Cmd + Opt + Space) > Go to Folder (Shift + Cmd + G) > Paste ~/Library/Application Support/Postman  > hit return > Delete the files.

   Windows: Open File Explorer and paste in the Path field C:\Users\<user>\AppData\Local\Postman and C:\Users\<user>\AppData\Roaming\Postman and delete the files in both locations.

   Linux: ~/.config/Postman

4. Go to the download page and install the latest version of Postman (Windows users only). 

Resolution steps to rename your Postman folder

1. Rename your Postman file Postman.old located at the below locations depending on your operating system.
   macOS: go to Finder (Cmd + Opt + Space) > Go to Folder (Shift + Cmd + G) > Paste ~/Library/Application Support and hit return.
   Windows: go to File Explorer and paste in the Path field C:\Users\<user>\AppData\Local\Postman and C:\Users\<user>\AppData\Roaming\Postman
   We suggest you rename the file Postman_local.old and Postman_roaming.old
   Linux: ~/.config
2. Open the Postman Desktop app. This will trigger the creation of a new Postman folder in your local data. 
3. Quit the app. 
4. Transfer your Indexed DB files from your Postman.old folder to your new Postman folder. 
5. Open the Postman Desktop app, if the data populates as expected, go ahead and remove the <Postman.old> folder.

Further troubleshooting for Windows users

1. Launch Postman from the command prompt, using the following command: start /affinity 1 %LocalAppData%\Postman\app-7.3.4\Postman.exe

2. Check your Windows environment for a NODE_OPTIONS variable. Remove it, then launch Postman again using the command above.

 

If the app continues to throw this error upon the launch after trying all the troubleshooting options above, please submit a support request. For our team to help you solve this issue efficiently, please make sure to share the information below.

• A walkthrough of the steps you already took to try to resolve the issue.
• A screenshot of the error. 
• Your app logs.