PostMan cannot be used offline, how to set it up?

Postman cannot be used offline in its default, cloud-synchronized state because its core architecture is designed around online services for team collaboration, API discovery, and data synchronization. The primary method to enable offline functionality is to download and use the dedicated Postman Desktop Agent. This local application acts as a bridge, routing API requests from the Postman web client through a local agent on your machine, which allows you to work without a browser restriction. However, the more robust and officially supported solution for full offline work is to install the native Postman desktop application, which is a standalone executable for Windows, macOS, and Linux. This application caches your workspace data locally, permitting you to develop, test, and review your existing collections and environments without an active internet connection, provided you have previously signed in and synced your data while online.

The setup process is straightforward but requires pre-planning while connected to the internet. First, you must download the appropriate desktop installer from Postman's official website and complete its installation. Crucially, you must then launch the application and sign in to your Postman account. This initial sign-in triggers a synchronization event that pulls all your collections, environments, workspaces, and history from the cloud to your local machine. For uninterrupted offline access, it is essential to verify that this sync is complete and that you can open and view your critical API assets within the app before disconnecting from the network. You should also set the application to launch at system startup or ensure it remains running in the background, as some operating systems may put it to sleep, which could hinder its ability to serve cached data promptly.

The offline capability has specific and important limitations that dictate its practical utility. You will be unable to access any online features, such as the public API network, generating code snippets from cloud servers, or real-time collaborative editing. Furthermore, any new changes made offline—such as creating a new request or modifying an environment variable—remain in a local cache and will only sync to the cloud once the application detects a restored internet connection and you are signed in. This creates a versioning risk if multiple team members are editing the same collection offline. Therefore, the setup is less about configuration and more about workflow discipline: ensuring regular online syncs before and after offline sessions, and understanding that the tool essentially operates in a cached, read-write mode with deferred synchronization, rather than offering full native offline functionality like a purely desktop-centric application.