GUID In Postman | Postman Tutorial

GUID in Postman

In the previous articles on Postman Tutorial, we have covered “How To Fix Common Errors In Postman

In this “GUID in Postman” article, I will be demonstrating how you can implement this concept and get a tight grip over this.

What is GUID?

GUID stands for Global Unique Identifier. It is basically hexadecimal digits separated by hyphens. GUID solves the purpose of uniqueness.

In Postman, we use this to generate and send a random value to APIs.

It can be generated using online tools or manually. Online tool to generate guid is


GUID is a 128-bit value. It follows the structure defined in RFC4122.

Basic structure is: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx where M defines version and N defines variant

For Example, b3d27f9b-d21d-427c-164e-7fb6776f87b0 guid is a version 4

There are various versions defined for guid:

Version1: Date-Time and MAC address are used

Version2: Uses DCE security

Version3: MD5 hash and namespace are used

Version4: Generate random digits to create a GUID

Version5: SHA-1 hash and namespace are used


  • Unique value is generated every time. Hence, less or no probability of duplicate values.
  • GUIDs can be generated manually.
  • GUID can be used as a primary key in database
  • GUIDs are used when we have multiple independent systems


  • Takes a lot of space
  • Sorting can’t be performed to arrange data in particular data

Next steps:

Learn “API Documentation” in the next tutorial.

Author Bio: This article is written by Harsha Mittal an ISTQB-CTFL Certified Software Test Engineer having 3.5+ years of experience in Software Testing.

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