Postman Script

global  : pm.globals.set("key", "value"); collection : pm.collectionVariables.set("key", "value"); environment: pm.environment.set("key", "value"); local  : pm.variables.set("key", "value");

global  : pm.globals.unset("key"); collection : pm.collectionVariables.unset("key"); environment: pm.environment.unset("key"); local  : pm.variables.unset("key");

Script Request

// GET Request
pm.sendRequest(activityInstanceURL, function (err, response) {
    activityInstance = response.json();
    // console.info(activityInstance);
});

//  POST Request
var payload = {
        'processInstanceIdIn': [processId],
        'sorting'            : [{
            'sortBy'   : 'variableName',
            'sortOrder': 'asc'
        }]
    },
    options = {
        url   :  variableInstanceURL, 
        method: 'POST',
        header: {
            'Accept'      : '*/*',
            'Cookie'        : cookie,
            'Content-Type': 'application/json'
        },
        body  : {
            mode: 'raw',
            raw : JSON.stringify(payload)
        }
    };

pm.sendRequest(options, function (err, response) {
    variables = response.json();
    //console.log(variables);
});

Before Request

let envBasedId = parseInt(pm.environment.get("env-based-id"));
var payload    = JSON.parse(pm.request.body.raw);
payload.id     = envBasedId;

let raw = JSON.stringify(payload);
pm.request.body.raw = raw;

var moment = require("moment"),
    init   = function(cli, ide, eon, today, birthDateMin, birthDateMax){
        birthDateMin = eon(today).subtract(18, 'years').add(1, 'days').format("DD/MM/YYYY");
        birthDateMax = eon(today).subtract(66, 'years').format("DD/MM/YYYY");
        ide.variables.set('adult.birth.date.invalid.min', birthDateMin);
        ide.variables.set('adult.birth.date.invalid.max', birthDateMax);
        cli.info(`adult.birth.date.invalid.min: ${birthDateMin}`);
        cli.info(`adult.birth.date.invalid.max: ${birthDateMax}`);
    };
init(console, pm, moment, new Date());

var moment    = require("moment"),
    format    = 'DD/MMM/YYYY',
    today     = new Date(),
    startDate = moment(today).format(format),
    endDate   = moment(today).add(1, 'years').format(format),
    keys      = {startDate: 'startDate', endDate: 'endDate'},
    preRequest= function(cli){
        pm.variables.set(keys.startDate, startDate);
        pm.variables.set(keys.endDate, endDate);
        
        cli.info(`${keys.startDate}: ${startDate}`);
        cli.info(`${keys.endDate}: ${endDate}`);
    },
    init      = function(cli){
        preRequest(cli)
    };
init(console);

After Request

pm.test("Status code is 200", function () {
    pm.response.to.have.status(200);
});

pm.test("Request & Response id match", function () {
    let envBasedId = parseInt(pm.environment.get("env-based-id"));
    pm.expect(pm.response.json().id).to.eql(envBasedId);
});

pm.test("Successful Quotation", function () {
    pm.response.to.have.status(200);
    pm.expect(pm.response.json().message).to.eql("Quotation has been created successfully.");
    pm.collectionVariables.set("quotationRefId", pm.response.json().refId);
});

OOP Script

var moment = require("moment"),
    init   = function(console, postman, moment, birthDate, debug){
        birthDate = new AdultBirthDate(console, postman, moment);
        birthDate.setUserVars(debug);
    };

const CHRONO_UNIT = { YEARS : 'years', DAYS  : 'days' },
      DATE_FORMAT = { DD_MM_YYY: 'DD/MM/YYYY' },
      USER_VARS   = { BIRTH_DATE: {
        VALID   : {
            MAX: 'adult.birth.date.valid.max',
            MIN: 'adult.birth.date.valid.min'
        },
        INVALID : {
            MAX: 'adult.birth.date.invalid.max',
            MIN: 'adult.birth.date.invalid.min'
        }
    }};

class AdultBirthDate {
    constructor(console, postman, moment){
        this.cli = console;
        this.ide = postman;
        this.eon = moment;
    }
    
    get validMinDate(){
        return this.eon(new Date()).subtract(18, CHRONO_UNIT.YEARS).format(DATE_FORMAT.DD_MM_YYY);
    }
    get validMaxDate(){
        return this.eon(new Date()).subtract(66, CHRONO_UNIT.YEARS).add(1, CHRONO_UNIT.DAYS).format(DATE_FORMAT.DD_MM_YYY);
    }
    get invalidMinDate(){
        return this.eon(new Date()).subtract(18, CHRONO_UNIT.YEARS).add(1, CHRONO_UNIT.DAYS).format(DATE_FORMAT.DD_MM_YYY);
    }
    get invalidMaxDate(){
        return this.eon(new Date()).subtract(66, CHRONO_UNIT.YEARS).format(DATE_FORMAT.DD_MM_YYY);
    }

    setUserVars(debug){
        debug && this.info();
        this.ide.variables.set(USER_VARS.BIRTH_DATE.VALID.MAX,   this.validMaxDate);
        this.ide.variables.set(USER_VARS.BIRTH_DATE.VALID.MIN,   this.validMinDate);
        this.ide.variables.set(USER_VARS.BIRTH_DATE.INVALID.MAX, this.invalidMaxDate);
        this.ide.variables.set(USER_VARS.BIRTH_DATE.INVALID.MIN, this.invalidMinDate);
    }

    info(message){
        message  = `${USER_VARS.BIRTH_DATE.VALID.MAX}  : ${this.validMaxDate}\n`;
        message += `${USER_VARS.BIRTH_DATE.VALID.MIN}  : ${this.validMinDate}\n`;
        message += `${USER_VARS.BIRTH_DATE.INVALID.MAX}: ${this.invalidMaxDate}\n`;
        message += `${USER_VARS.BIRTH_DATE.INVALID.MIN}: ${this.invalidMinDate}`;
        this.cli.info(message);
    }
}

init(console, pm, moment);

Playground

pm.request.body.formdata pm.request.body.options pm.request.body.raw pm.request.header pm.request.method pm.request.body pm.request.url	pm.request.body.mode = "raw"; pm.request.body.raw = JSON.stringify({ id : 1, name : "Chorke, Inc.", license : "Incorporation", trademark: "Chorke" });	pm.request.body.mode = "formdata"; pm.request.body.formdata = [ {type: "text", key: "name", value: "Chorke, Inc." }, {type: "file", key: "logo", src: "/file/path/name.ext"}, {type: "file", key: "sign", value: {name: "sign.png", type: "application/pdf", content: atob("<base64>") }} ];

Knowledge

npm install -g newman npm install -g moment npm install -g path npm install -g fs	pm.test("Check values", () => { pm.expect(pm.response.json().id).to.not.eql(null); pm.expect(pm.response.json().category.name).to.not.eql(""); });

References

Postman subtract time using Moment.js Postman formate date using Moment.js Postman writing pre-request scripts Postman add time using Moment.js Postman test script examples Postman JavaScript reference Postman dynamic variables Postman variable scopes Postman writing tests Scripting in Postman	Postman Flows » Durables » Working with access tokens Postman Flows » Running Requests in Sequence Defining variables with scope in scripts Postman sharing and persisting data Postman Visualize » Handlebars Postman visualizing response Postman » Write to a file Postman » Newman NPM Yarn	Postman » Add file in a Pre-request script Postman » Multipart/form-data request Postman » Pre-request Test Fails Postman » JSON POST Request Postman » Handle CSRF token
JavaScript Proprietary Library Example JavaScript Ali Express Discounted Cart JSON Schema Validation DrawIO Desktop Maven Rhino ExtJS J2V8 Ant Ivy	How to build Proprietary JavaScript Library Nashorn Base64 JQ Tool XPath