Postman Pre-Request Scripts and Tests Complete Guide

Published by SoftwareTestPilot

PDF • 90 pages • Notes • Intermediate • Postman

Published 28 September 2026 • Updated 29 September 2026

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Postman Pre-Request Scripts and Tests Complete Guide — practical Postman notes for software testers, 90 pages.

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Overview

This guide provides a JavaScript handbook for mastering Postman pre-request scripts and tests. It covers dynamic requests, variable management, Vault secrets, and workflow control, using `pm.request`, `pm.response`, `pm.test`, and `pm.expect`. This resource is structured with 80 focused chapters, each presenting a concept, a practical script, an implementation rule, and an exercise. It caters to both beginners learning sequentially and experienced API testers who can navigate directly to specific topics like data-driven testing, reusable scripts, or production scripting architecture.

What you'll learn

Understand Postman script execution flow
Manage variables across different scopes
Prepare dynamic request data
Use `pm.sendRequest` for async calls
Write comprehensive post-response tests
Implement reusable scripting patterns
Design robust API test automation

Topics covered

api-testing
javascript-typescript

How Postman Scripts Work
Variable Scope Precedence
Collection Variables
Environment Variables
Prepare JSON Body Values
pm.sendRequest Basics
Postman Vault Basics
Post-response Scripts
pm.test Fundamentals
pm.expect Fundamentals
Reusable Helper Functions
Chain a Create-Read-Delete Flow
Data-driven Tests with iterationData
Production Script Architecture
Final Scripting Checklist