What steps should I take to prompt Postman to interact with a Web API?

I have recently installed the Postman plugin for Chrome and I am curious about how to use it to call my web API.

Currently, I am making an AJAX call in JavaScript with the following code:

alert("Getting security token");

// Do AJAX call to get security token:
    $.ajax({
        url: [security token url],
        type: "POST",
        headers: {
            Accept: "application/json"
        },
        ContentType: "application/x-www-form-urlencoded",
        data: {
            grant_type: "password",
            username: [username],
            password: [password]
        }
    }).done(function(data)
    {
        var accessToken = data.access_token;
        
        alert(accessToken);

        alert("Getting json string");
        
        // Now that we have access token, send it along with the request for the json string:
        $.ajax({
            // meta data sent as URL parameters:
            url: [url to get json string],
            type: "GET",
            headers: {
                Authorization: "Bearer " + accessToken // access token
            },
            contentType: false,
            processData: false
        }).done(function(data)
        {
            $("#jsonDiv").html(data);
        }).fail(function(jqXhr, textStatus, errorThrown)
        {
            alert("jqXhr = " + JSON.stringify(jqXhr));
            alert("textStatus = " + textStatus + ", errorThrown = " + errorThrown);
        });     
    }).fail(function(jqXhr, textStatus, errorThrown)
    {
        alert("jqXhr = " + JSON.stringify(jqXhr));
        alert("textStatus = " + textStatus + ", errorThrown = " + errorThrown);
    });

How can I achieve the same functionality using Postman?

Answer №1

To achieve the desired outcome, you can follow these steps below. Begin by creating two APIs:

Start with the first API that calls the "security token URL" using the POST method. Include the following header:

  • Accept: application/json

In the body section, choose x-www-form-urlencoded and add the required keys along with their respective values:

  • grant_type: password
  • username:
  • password:

Remember, the password grant_type may also need client_id and client_secret, but it's not mentioned in your code snippet so perhaps it's not necessary.

Sending this request should return an access token.

For the second API, set the method to GET and provide the correct URL. Then include the following header: - Authorization: Bearer

If you want to enhance the process, consider utilizing the test tab to save the access token as an environment variable for use in subsequent calls. The same token can be used until it expires, eliminating the need to fetch a new one each time.

I hope this guidance is helpful, regardless of your current level of expertise. Feel free to reach out if you have any further questions or need additional assistance.

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