Ian Wilson

Developers building backend APIs need a reliable way to exercise and validate their endpoints, and the default choices for many teams have long been tools like Postman or the interactive documentation provided through Swagger/OpenAPI UIs. These platforms make it easy to craft requests and inspect responses.

Testing endpoints is a core part of backend work because it allows developers to:

• Confirm that routes behave as expected under different conditions.
• Reproduce bugs or edge cases quickly.
• Share reproducible examples with teammates or QA.
• Validate authentication, headers, and payload structures.
• Setup and configure an underlying database where there is no front end

Postman and Swagger became popular because they offer accessible, visual interfaces for these tasks. Postman provides a full-featured client for building and organising requests, while Swagger UI exposes live, interactive documentation directly from an API’s spec.

As development practices evolve, many developers are now looking for simpler, text‑based approaches that integrate directly into their coding environment. This is where .http files and editor‑native tools come into play, offering a more streamlined way to test APIs without leaving the IDE.

The rise of lightweight API testing workflows

Modern teams increasingly favour tools that minimise friction. Instead of juggling browser tabs, Postman collections, and environment windows, .http files let developers:

• Keep requests close to the code they relate to.
• Run tests inline, without leaving the editor.
• Share API examples in a format that is transparent, readable, and diff friendly.
• Treat API testing as part of the development loop rather than a separate activity.

This shift mirrors the broader trend toward text based tooling — think curl, Markdown documentation, and Infrastructure as Code — where simplicity and versionability outweigh UI driven convenience.

How .http files differ from Postman and Swagger

Postman and Swagger remain powerful tools, but .http files take a different approach:

• Simplicity — A .http file is just text. No collections and no workspaces. You write a request, run it, and see the result.
• Versionability — Because they’re plain text, .http files fit naturally into Git.
• Developer centric workflow — Instead of switching to a separate app, everything happens in the editor. Requests sit next to the code they exercise, making them ideal for documenting endpoints, debugging issues, or sharing reproducible examples with teammates.
• Zero lock in — .http files are editor agnostic and tool agnostic. They don’t depend on a proprietary format or cloud account.

Where Postman/Swagger excel at collaboration, visualisation, and large scale API management, .http files excel at speed, clarity, and integration with everyday development work.

Why VS Code is a natural home for .http files

VS Code’s ecosystem makes it an ideal environment for .http workflows:

• It already acts as the central hub for coding, debugging, and documentation.
• Extensions like Rest Client and HttpYac integrate tightly with the editor, offering inline execution, environment handling, response rendering, and scripting.
• Developers can keep API requests in the same workspace as the services they’re testing.

This creates a development environment where API testing feels like an extension of writing code—not a separate task requiring a separate tool.

Part 3 of this article will explore the HttpYac .http file extension for VS Code, which has emerged as a popular and modern option, especially for teams that want scripting, environment layering, test automation, and CI friendly execution.