Can Postman take a file as a variable from a path?

Question

I have a postman collection, with a set of three API calls I'd like to chain together and feed with a data file using the runner function. Lets say they're:

/prepareUpload

/upload

/confirmUpload

and the output of each is needed for the next step. I'm happily pulling stuff out of the responses and putting them into variables ready for the next call, but the bit I seem to be falling down on is the /upload needs a file parameter of type file, but Postman doesn't seem to let me set it to a variable:

I've tried exporting the collection, manually editing the json to force it to a variable and running that, so something like :

<snip>
    {
       "key": "file",
       "contentType": "{{contentType}}",
       "type": "file",
       "src": ["{{fullpath}}"]
    }
  ],
  "options": {
    "formdata": {}
}

where {{contentType}} and {{fullpath}} are coming from my data file, but it never seems to actually do the upload.

Does anyone know if this is possible?

Steppe

Answer 1

Ok, so found the answer to this, and the short version is - Postman can't do it, but Newman can :

https://github.com/postmanlabs/newman#file-uploads

It's a fair bit more effort to get it set up and working, but it does provide a solution for automating the whole process.

Steppe

Answer 2

Issue:

In postman if we check the UI, we notice that there is no way to define file path as variable.

This looks like a limitation when we need to run file from different systems

Solution:

The solution is to hack the collection.json file. Open the json and edit the formdata src and replace it with a variable, let say file_path so : {{file_path}}

Now in Postman:

in pre request you can below code to set the path

pm.environment.set("file_path","C:/Users/guest/Desktop/1.png")

You can also save it as environment variable directly or pass through cmd using --env-var when using newman.

Note:

set access file from outside working directory as true (settings from top right corner)

Paez

Answer 3

It's not possible to read local files with Postman (There are at least two issues concerning that in their tracker on github: 798, 7210)

A workaround would be, to setup a server that provides the file, so you could get the data via a request to that server.

Hurtful

Thanks, I think my use case is slightly different though. I can get postman to read the data file using a runner (blog.postman.com/…) but it's getting it to attach a file where it's falling down – Steppe

Answer 4

For Postman (as of Version 9.1.5), on Mac os, you can trick postman by naming a file in your shared directory with your variable name (ie. {{uploadMe}}). Then you choose this file (named as the variable) from the file selector and Voilà.

In my case the files I upload are located in the same shared directory and don't forget to set the shared directory in your postman settings.

Beanfeast

Answer 5

The solution is quite simple,

• Make sure you have the latest version of postman
• Go to postman settings to find your working directory and add the desired file to your postman working directory
• In the body tab, select formdata
• In the pre-request script tab, enter the code below.

pm.request.body.mode = "formdata";
pm.request.body.formdata = {
    "key": "preveredKey",
    "type": "file",
    "src": "fileName.extension"
}; 

Thermidor