Cypress WebSocket Server

JSON →
library 0.1.2 ·javascript maintenance
verified Jun 7, 2026

A Cypress plugin for mocking WebSocket servers during end-to-end tests. Version 0.1.2 is stable but low-activity. It allows defining a sequence of server and client messages in a JSON fixture file, enabling deterministic testing of WebSocket interactions. The plugin listens on localhost:1999 and enforces ordered message exchanges. Compared to other WebSocket mocking libraries, it integrates directly with Cypress commands and fixtures.