Restrict some HTTP Methods on Postman

You could add a variable to the Method dropdown - Add {{METHOD}} to the field and than add the same variable name in your environment file with the value you want?

You could also just delete the Methods you don't want to use from the dropdown, these can just be added in after, if you need it again.

https://learning.postman.com/docs/postman/customizing-postman/#customizing-request-methods

Postman does not provide any in-built functionality like this. However, you can use pre-request scripts for this. Write this in your pre-request script of the API you want to limit certain request methods-

var request = pm.request;
if(request.method.includes("POST") || request.method.includes("PUT")){
    console.error("Inavlid request method");
    throw new Error("Invalid request method");
}

The drawback of this approach is that you need to copy-paste this in every API's pre-request script. If you want to bypass that, you can cache this entire code into a postman variable and just eval that variable in every API. Steps-

• Create an environment variable in your postman with this name as "my-script" and value as-

() => { var request = pm.request;
if(request.method.includes("POST") || request.method.includes("PUT")){ console.error("Inavlid request method"); throw new Error("Invalid request method"); }}

• Now just copy and paste this line in every pre-request script in your collection-

eval(pm.environment.get('my-script'))();