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)
}