Postman CORS Error in Web App

How to fix it

Try these in order — the most common fix is first.

1. 1. Switch to the Desktop Agent

   Copy steps
   1. In the web app footer click the agent name and pick Desktop Agent (or turn on Auto-select)
   2. Click Download Desktop Agent if it is missing, install and launch it
   Did this fix it? Yes No

2. 2. Use the desktop app

   1. The Postman desktop app sends requests without CORS limits and needs no agent
   Did this fix it? Yes No

3. 3. Use Interceptor on Safari

   1. Install the Interceptor Agent browser extension; note it does not support CA, self-signed or client certificates
   Did this fix it? Yes No

4. 4. Update the agent

   1. Menu bar Postman Agent > Check for Updates > Install update & restart
   Did this fix it? Yes No

Symptoms

Requests from Postman web fail with a CORS or 'Cross-origin request blocked' error, or the browser agent returns no response.

Why it happens

• Postman web is using the Browser Agent, which obeys browser CORS rules
• Desktop Agent not installed or not running
• Safari does not support the Desktop Agent

This guide also covers

• postman cors error
• postman web cors
• postman desktop agent not running

Other Postman errors

• Postman Could Not Get Response Error
• Postman Error: connect ECONNREFUSED
• Postman SSL Error: Self Signed Certificate
• Postman Scratch Pad Removed: Login Required to Save
• Postman Collection Runner Limit: You've Exhausted All Available Runs
• Postman Collections Not Syncing
• Postman Lost My Collections
• Postman Slow and High Memory or CPU Usage