Data driven testing per request without using data file

Create a environment variable called “csv” and copy the below content and paste it as value:

username,password,error_message,error_code
username1,password1,errormessage1,errorcode1
username1,password1,errormessage1,errorcode1

Now in pre-request add :

//we use variables as it will get destroyed after the run . So if index returns null then it means it’s the first iteration

if (!pm.variables.get("index")) {

    const parse = require('csv-parse/lib/sync')
//Environmental variable where we copy-pasted the csv content
const input = pm.environment.get("csv");
const records = parse(input, {
        columns: true,
        skip_empty_lines: true
    })

    pm.variables.set("index", 0)
    pm.variables.set("records", records)
}

records = pm.variables.get("records")
index = pm.variables.get("index")

//we are setting variable 
if (index !== records.length) {
for (let i of Object.entries(records[index])) {
        pm.variables.set(i[0], i[1])
    }
    pm.variables.set("index", ++index)
    pm.variables.get("index")===records.length?null:postman.setNextRequest(pm.info.requestName)
}

Now you can run data driven for that one particular request:

Note that here we used pm.variables. this is because it creates local variable that get destroyed after the collection run completes .

So for each run , first value will be null and then will be set to 0

Eg collection:

https://www.postman.com/collections/eb144d613b7becb22482

use the same data as environment variable content , now run the collection using collection runner or newman.

You can import this collection by clicking file >import >and then choosing links

Output: