Difference Between Global, Environment, and Collection Variables in Postman

Global Variables:

• Stored globally across all requests and collections.
• It can be accessed from any request or collection.
• Use cases: API keys, common headers, or base URLs

Environment Variables:

• Stored within a specific environment (e.g., dev, staging, prod).
• It can be accessed only from requests within the same environment.
• Use cases: Environment-specific settings, such as URLs, credentials, or timeouts.

Collection Variables:

• Stored within a specific collection.
• It can be accessed only from requests within the same collection.
• Use cases: Collection-specific settings, such as API endpoints, headers, or query parameters.