callsign
OpenAPI Explorer for VS Code
A VS Code extension that transforms OpenAPI specifications into an interactive, developer-friendly interface for real-time API exploration.
Demo
About
Callsign is a VS Code extension that transforms OpenAPI specifications (a standard for describing REST APIs) into an interactive, developer-friendly interface directly within your editor. It parses OpenAPI 3.x documents and presents endpoints, schemas, and parameters in a clean, navigable UI, eliminating context switching to external tools.
Built with the VS Code Extension API, Callsign provides real-time API exploration with features like endpoint filtering, request building, and schema visualization. It's designed for developers who want fast, local access to API documentation without leaving their development environment.
Whether you're integrating third-party APIs or documenting your own services, Callsign streamlines the workflow by keeping everything in one place.
Features
OpenAPI 3.x Support
Parses and visualizes OpenAPI 3.x specifications natively in VS Code with full schema validation.
Endpoint Filtering
Search and filter endpoints by path, method, or tag to quickly find the API operations you need.
Schema Explorer
Explore request/response schemas with expandable JSON views and detailed property documentation.
Built-in HTTP Client
Built-in HTTP client for testing endpoints without leaving the editor or using external tools.