How to send multiple requests using Postman pre request script?

Question

In the following postman pre request script, I need to call multiple requests before I make an actual postman request.

Firstly, it will call session API to retrieve the session id

After session id is success only, then I need to call customer signon to make the user logged in.

So I did the following changes in my postman prerequest script but some how the LocalSessionId in the customer signon request is undefined.

const sessionRequestData = {
    url: "http://myurl.com/session",
    method: 'POST',
    header: { 'content-type': 'application/json' },
    body: {
        mode: 'raw',
        raw: JSON.stringify({
    "device": {
        "id": "web",
        "type": "WEB"
    }
    }
};

pm.sendRequest(sessionRequestData, function (err, res) {
   var jsonData = res.json();
    if (err) {
        console.log("mailman: error retrieving session id"+err);
    }
    else {
        console.log("mailman: retrieved session data succesfully"+ jsonData.session.id);
        pm.variables.set("LocalSessionId", jsonData.security.session.id);
       
    }
});


const customerSignonRequestData = {
    url: "http://myurl.com/CustomerSignOn",
    method: 'POST',
    header: { 'content-type': 'application/json' },
    body: {
        mode: 'raw',
        raw: JSON.stringify(  "customerRequest": {
        "identities": {
            "identity": [
                {
                    "data": "sessionId",
                    "value": `${pm.variables.get("LocalSessionId")}`
                }
            ]
        }
    });


 pm.sendRequest(customerSignonRequestData, function(err, res){
     console.log("customer sign on request "+ JSON.stringify(customerSignonRequestData.body.raw))
            var jsonData = res.json();
            if (err) {
       console.log("mailman: unable to signon"+err);
    } else {
        
console.log("mailman: login successful"+ JSON.stringify(jsonData))
    }
        });

Can anyone suggest how can I make sure that the customer signon is called after the session is retrieved only.

This post from the Postman community fourm might help here. It explains how this can be achieved in the pre-request script. https://community.postman.com/t/async-operations/24314 — Danny Dainton, Nov 24 '21 at 07:29

score 0 · Answer 1 · answered Jun 08 '23 at 14:11

I had this exact issue. The trick is that you have to nest the second request inside the first. So, it should look something like this:

const sessionRequestData = {
   ...
};
pm.sendRequest(sessionRequestData, function (err, res) {
    ...
    const customerSignonRequestData = {
        ...
    };
    pm.sendRequest(customerSignonRequestData, function(err, res){
        ...
    });
});

score 0 · Answer 2 · answered Jun 14 '23 at 03:16

Here is how I did:


pm.sendRequest({
    url: "http://myurl.com/session",
    method: 'POST',
    header: { 'content-type': 'application/json' },
    body: {
        mode: 'raw',
        raw: JSON.stringify({
            "device": {
                "id": "web",
                "type": "WEB"
            }
        })
    }
}, function (err, res) {
    if (err) {
        console.log("Error retrieving session id: " + err);
    } else {
        console.log("Retrieved session data successfully");
        const sessionId = res.json().session.id;
        pm.sendRequest({
            url: "http://myurl.com/CustomerSignOn",
            method: 'POST',
            header: { 'content-type': 'application/json' },
            body: {
                mode: 'raw',
                raw: JSON.stringify({
                    "customerRequest": {
                        "identities": {
                            "identity": [
                                {
                                    "data": "sessionId",
                                    "value": sessionId
                                }
                            ]
                        }
                    }
                })
            }
        }, function (err, res) {
            if (err) {
                console.log("Unable to signon: " + err);
            } else {
                console.log("Login successful: " + JSON.stringify(res.json()));
            }
        });
    }
});

How to send multiple requests using Postman pre request script?

2 Answers2