Update postman collection from swagger specification file

Question

I'm importing a swagger specification file into postman to create a collection, at this point, works as expected and the collection is generated with all requests & sub-folders, fine!!. But when the api is updated, I need update the postman to update all requests based on the new specification. I can't find a action like "update" or something else. I'm trying import the new specification into postman and he say:

A collection APIName already exists. What would you like to do?

Replace or Import as copy

a copy its a not feasible option, then I use replace and the existent collection is updated, but all tests, parameters, pre-req scripts are remove and I need reconfigure all again.

I'm missing something, exist a way to import & update a existent collection from a specification file, without losing existent tests & configuration?

thanks in advance!

Answer 1

I have made a small tool to do this: swagger2postman: convert swagger to postman collection and update exist collection

The tool will combine new and old collection, when conflict, it will use saved in postman. The tool can detect update in query parameter, but not post body. It will keep all your collection and test cases.

Answer 2

Postman does not support this as of now. Link

Alternative I learned from this blog. In short:

1. Update your OpenAPI YAML/JSON files.
2. Import to Postman as a new collection.
3. Export the new collection from Postman. As JSON in Collection v2.1 format (recommended).
4. Using Postman API (Update Collection), update the existing collection with the JSON in step 3 as body. Make sure to update collection_uid accordingly.

Postman update collection API body sample:

{
  "collection": 
  <------- YOUR EXPORTED COLLECTION HERE --------->
}