zerocode-tdd is a community-developed, free, open-source, outcome-driven automated testing for microservices APIs, Kafka(Data Streams), Databases and Load scenarios. all defined in simple JSON or YAML — with zero coding.

Prevent OpenAPI Generator from redefining your Java contract. Generics-aware client generation for Spring Boot — available on Maven Central.

Efficient expense tracking app for individuals and businesses. Log daily expenses, generate monthly reports, categorize spending, and integrate with a database. Check out the API contract: https://petstore.swagger.io/?url=https://raw.githubusercontent.com/pradipmudi/expensys/main/src/main/java/com/expensys/openapi/expensys_openapi.yml

A CLI tool that does health and idempotency checks for your REST APIs

A Python framework for contract testing in CI/CD pipelines. Validates communication boundaries between services without requiring a shared environment.

Detect API schema drift before your integrations break.

API (or Service) Contract example (for my own reference)

Challenge Brain Agriculture

Audits APIs against OpenAPI, AsyncAPI, JSON Schema, protobuf, or PRD contracts to catch drift before release.

Public Interface, SDK, and Architecture Contracts for the ERPS Control Plane

This GitHub repository complements my article series: One API to rule them all

Vue 2 and Element UI admin dashboard practice with routing, CRUD pages and API contract documentation.

Go SDK for StellSpec, providing shared specifications, models, and contracts for StellHub cloud-native infrastructure.

A fast API contract validation and regression testing tool that validates live API responses against OpenAPI/Swagger specifications. A fast API contract validation and regression testing tool.

Schema registry and CI guard for un-documented REST APIs — infers JSON Schema from HAR, mitmproxy, and curl captures, and fails builds on breaking response changes. Zero runtime deps.

Prevents silent production breaks by automatically validating microservice API contracts and detecting breaking changes before deployment.

Small .NET library for building consistent API contracts.

OpenAPI 3.0.3 specification and architecture documentation for Fast Eat food delivery platform. Defines REST API contract for JWT authentication, location-based restaurant discovery, order placement, and real-time drone delivery tracking. Implemented across multiple backend stacks (Spring Boot, NestJS, FastAPI) with consistent API behavior.

Automatically handle strict request decoding, transparent validation with JSON-tag reflection, and standardized JSON responses.

Java SDK for StellSpec, providing shared specifications, models, and contracts for StellHub cloud-native infrastructure.