External library in Postman

Question

I want to use linq.js for my assertions. Is there a way to include an external library in Postman?

Answer 1

I am doing pretty much the same than @grinderX19.

I run this once to load my global variable:

postman.setGlobalVariable("myUtils", function myUtils() {
let utils = {};

utils.function1= function function1(Arg1, Arg2){
    <code>
};

utils.function2= function function2(Arg1, Arg2){
    <code>
};

return utils;
} + '; myUtils();'
);

Then, I am calling it like this in Postman requests:

//import the global variable
let utils = eval(globals.myUtils);

//Call a function contained by this global variable
var var1 = utils.function1(arg1, arg2);

Hope this helps.

Answer 2

There's an open feature for that in Postman's bugtracker since 2015: Loading External JS Files #1180 but it doesn't seem they're actively working on it.

Meanwhile I'm using a workaround mentioned in one of the comments by putting a minimized custom JS in a global variable and loading it in the beginning of each script where I'm using this code:

eval(postman.getGlobalVariable("environment variable key"));

Answer 3

I found a solution at https://postman-quick-reference-guide.readthedocs.io/en/latest/libraries.html#custom-libraries

pm.sendRequest("https://example.com/your-script.js", (error, response) => {
    if (error || response.code !== 200) {
        pm.expect.fail('Could not load external library');
    }

    eval(response.text());

    // YOUR CODE HERE
});

Example using jalali-moment:

pm.sendRequest("https://unpkg.com/jalali-moment/dist/jalali-moment.browser.js", (error, response) => {
    if (error || response.code !== 200) {
        pm.expect.fail('Could not load external library');
    eval(response.text());
    var currentTime=moment().locale('fa').format('YYYYMMDDHHmmss');
    console.log(currentTime);
});