GraphQL Request Override (GROE)

Intercept and mock GraphQL responses by operation name, query pattern, and variable conditions — no backend changes required.

GROE - GraphQL Request Override Extension Mock and test GraphQL APIs directly in your browser - zero code changes required. 🚀 KEY FEATURES • Mock Mode: Block requests and return fake data instantly • Override Mode: Merge mock data into real API responses (unique!) • Variable Conditions: Match rules based on GraphQL variable values • Query Rewriting: Test new fields before backend implements them • Batch Request Support: Handle multiple operations individually • Priority System: Control which rule wins when multiple match • Groups & Organization: Toggle entire test scenarios on/off • Import/Export: Share rules with your team via JSON files ✨ WHY USE GROE? Frontend Development → Build features before the API is ready → Test with specific data states instantly → No waiting for backend team QA Testing → Test empty states, error flows, edge cases → Simulate slow responses and timeouts → Reproduce production bugs easily Demo Preparation → Replace real customer data with demo-safe data → Show features that aren't in production yet → Works seamlessly on live production sites 🎯 UNIQUE ADVANTAGES Unlike Postman mock servers or code-based mocks (MSW): ✓ Zero setup - install and go ✓ Works on production sites without modifications ✓ Override mode: merge real + mock data (impossible with other tools) ✓ No proxy configuration needed ✓ Non-developers can create and manage rules ✓ Instant on/off toggle 🔒 SECURE & PRIVATE • All data stored locally on your device • No external network requests • No cloud sync or data sharing • Open source and auditable 📊 PERFORMANCE • ~2ms overhead per request (imperceptible) • Only inspects GraphQL POST requests • Zero impact on GET requests • Smart caching and early exit optimization 🛠️ PERFECT FOR • Frontend developers working on GraphQL apps • QA engineers testing UI edge cases • Product managers preparing demos • Teams using Apollo Client, Relay, or any GraphQL client 💡 EXAMPLE USE CASES → Test checkout flow with various cart states → Reproduce "crash with 100+ notifications" bug → Demo premium features before deployment → Test loading states with 5-second delays → Simulate authentication errors → Add feature flags without backend changes No code changes. No infrastructure. Just install and start mocking. Perfect for React, Vue, Angular, Next.js, or any web app using GraphQL.