ben-ic/worldfixture

A local emulator for enterprise SaaS APIs — Slack, Gmail, Google Drive, GitHub, Jira, Notion, S3 and more — with the real response shapes, pagination, auth and per-document ACLs, over a corpus you supply.

Local API emulation for CI and no-network sandboxes

A simulation platform for use during testing, during development and for high-fidelity application previews

💻 A fully functional local AWS cloud stack. Develop and test your cloud & Serverless apps offline

Turn an OpenAPI spec into a local API in one command. Build and test your frontend with custom responses, shared state, and simulated failures, without waiting for the backend.

Engine which simulates your exact Dynamics 365/CRM instance locally including all of it's logic!

Open-source OpenAPI mock server with cloud hosting and local modes for development, testing, and CI. Generates realistic API responses from specs with latency simulation, error injection, proxy fallback, and request validation. Validated against 2,200+ real-world OpenAPI specs.

🎉 tool that easily and quickly imitates server operation, create full fake api in few steps

A sandbox for the third-party APIs you depend on. Built from the provider's spec, it fails on purpose, and it replays the exact failure production hit.