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Carbon Docs

Welcome to Carbon

Carbon is an API behavior engine. Give it an OpenAPI spec, AsyncAPI document, Protobuf or gRPC service definition, Postman collection, HAR file, GraphQL schema, or recorded traffic. Carbon analyzes the API shape, builds an intermediate representation and behavior graph, then runs a deterministic replica you can use in development, CI, or shared review environments.

Static mocks return canned JSON. Carbon keeps state, so writes affect later reads.

Why Carbon

Section titled “Why Carbon”
  • Stateful behavior. A POST changes what future GETs return.
  • Deterministic. The same inputs produce the same outputs.
  • Controlled traffic path. Runtime traffic stays in the replica unless you configure another path.
  • Portable state. Snapshots, branches, and replays travel with your code.

What’s next

Section titled “What’s next”
Quickstart Start your first replica in under a minute.
Architecture See how ingestion turns API inputs into a runtime.