capnwasm OpenAPI conversion

Paste OpenAPI JSON. The browser converts it to capnwasm's manifest IR, emits canonical .capnp, and emits canonical OpenAPI again.

Live converter

OpenAPI ↔ Cap'n Proto bridge. For pure OpenAPI → typed JS client work, mature generators (openapi-typescript, kiota, openapi-generator) cover more edge cases. This page's niche is the rare OpenAPI ↔ .capnp pairing, and it runs the same parser/emitter modules as the CLI: parseOpenApi, buildManifest, buildCapnp, buildOpenApiJson.

Direction: OpenAPI → .capnp .capnp → OpenAPI Ready.

Input

Drop a file here, or click to upload.

Manifest summary

Run conversion.

Result

—

Round-trip back to OpenAPI

Sanity check: input → manifest → canonical OpenAPI. Should match your input.

—

Pros / cons

path	good for	tradeoff
OpenAPI / JSON	public REST docs, partner APIs, DevTools-friendly debugging	lowest adoption cost
Cap'n Proto	binary payloads, sparse reads, cross-language RPC, explicit schema evolution	requires schema/runtime discipline
Manifest pipeline	keeping OpenAPI, capnp, tests, probes, codecs, and tools in sync	extra contract step up front