Test and debug values in gRPC requests using JavaScript in Postman

Postman has a powerful scripting environment that enables you to add JavaScript code (scripts) in your gRPC requests. You can define scripts for two hooks available during the request execution lifecycle:

• Before invoking the method and establishing a connection with the server, in the Before invoke tab.
• After closing the connection with the server, in the After response tab.

You can use scripts to write API tests, debug your requests (by logging to Postman Console, or dynamically read/update the values of variables. You can import packages with scripts and tests from your team's Package Library. You can also import packages from external package registries, such as npm and JSR.

This is all powered by the Postman Sandbox, a JavaScript execution environment available to you while writing your Before invoke and After response scripts. The code you write in these scripts is run in the sandbox.

Next steps

To see several example test scripts for gRPC requests, go to Write tests for gRPC requests using JavaScript assertions in Postman.

To learn more about Postman test scripts in general, see Write scripts to test API response data in Postman.