How to Test Your React Frontend When the Backend Is Offline
Blog post from Speedscale
Traffic recording and mocking with the proxymock tool can let React developers test frontends independently of live backend services by capturing real HTTP interactions once and replaying their responses locally. The approach addresses common development problems such as unstable staging environments, unavailable databases, microservice dependencies, slow feedback cycles, and inconsistent test conditions, while preserving production-like API behavior rather than relying on manually fabricated test data. In the demonstrated React, Go, and PostgreSQL CRM application, proxymock acts as a proxy to record frontend-to-API traffic, stores requests and responses as readable, version-controllable Markdown files, and later serves matching responses when the frontend runs without the API or database. The tool can also record PostgreSQL wire-protocol traffic, enabling backend services to run and be tested against mocked database responses, including automated replay and response comparison of previously captured API calls. Proponents describe the workflow as useful for offline frontend work, faster onboarding and CI/CD, API contract validation, reproducible debugging, and maintaining recorded traffic as living documentation that can be reviewed in Git or analyzed by AI tools.
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