The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

Open Source API Design

‘The API’ book by Sergey Konstantinov

A shared and somewhat opinionated style guide for everyone to enjoy.

Yasumu is a modern, free and open-source API laboratory for designing and testing API workflows

A plugin for Obsidian that lets you design and document API endpoints visually without leaving your notes.

Framework-agnostic, type-safe HTTP interface system with end-to-end type safety between client and server

A scalable, stateless RESTful API for academic attendance management. Features RBAC authentication (JWT), event-driven attendance validation, optimized query performance, and modular service-layer architecture. Supports multi-tenancy, request validation, and high concurrency handling.

Repository containing patterns and best practices for securing and protecting API designs

A visual OpenAPI 3.1 editor

Production-ready Multi-Tenant SaaS Backend architected with NestJS and PostgreSQL. It features robust data isolation (row-level tenancy), RBAC security, JWT authentication, and background job processing with BullMQ. Demonstrates enterprise patterns for scalable Software-as-a-Service applications with clean architecture.

"Unlock API documentation mastery with API Blueprint, a powerful tool for building and visualizing APIs."

The command line utility to run you APIs tests with www.apic.app

Discover the ultimate API reference guide for seamless integration and development.

TypeScript Node.js project demonstrating backpressure handling when API receives 1000 req/s but database handles 200 writes/s. Uses bounded queue with HTTP 429 responses to prevent memory exhaustion. Includes real-time metrics, Prometheusintegration, and PostgreSQL batch processing.

A boilerplate for building contract-first APIs in TypeScript with OpenAPI. Includes OpenAPI definition, compliant server setup, and npm package generation for seamless API development.

Production-oriented NestJS backend blueprint. JWT auth, RBAC, env validation, rate limiting, cron jobs, Dockerized structure.

Scalable TypeScript backend for a two-sided experiences marketplace with RBAC authentication, Prisma ORM, and modular API architecture for booking and vendor management.

Software Engineering Project - Blood Donor-Recipient matching App