How to Query salesforce object records using postman?

We have a situation where we need to query the salesforce object to find out that a particular record is present or not.

To find this out we can use the salesforce standard API of Data query.

https://<Your Instance>.my.salesforce.com/services/data/v57.0/query

The plan is as follows:

First create the connected app and share the client secret, client password to the external user/application

Make the first authentication call

Make the second api call using the access token and hit the https://<Your Instance>.my.salesforce.com/services/data/v57.0/query

Parse the data came in the response
Example to understand more onto this, you can refer to this url: LINK

Step1.

Authenticate User:

Note: If you have to do the authentication for production/Developer org then you need to replace the "test" keyword to "login" in the api url

On successfull API call, you will receive the value of "Access Token" in the key called "access_token"

Step 2: Make your query and put it in any encoding tool online. Like this from link https://www.urlencoder.org/

Step 3: Make the last api call using this encoded url:

Method type: GET

Now you should be able to retrieve the data in the response:

Now you can parse the json data in your response and can act accordingly in your application.

Cheers ✌️