Mokapi

Open-source, local-first API mocking tool for OpenAPI and AsyncAPI across HTTP, Kafka, MQTT, LDAP, and SMTP.

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Mokapi is a free, open-source, local-first mock API tool that simulates HTTP/REST, Kafka, MQTT, WebSocket, LDAP, and SMTP environments from OpenAPI and AsyncAPI specifications. It lets developers build frontend UIs before a backend exists, test error states and timeouts safely, and run CI/CD pipelines without external dependencies, with JavaScript scripting for custom responses. Aimed at developers who need multi-protocol mocking in one tool.

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