spikard 0.17.1

Codegen-first polyglot web toolkit with a Rust core and bindings for 14 languages

Spikard — Part of the spikard polyglot web toolkit.

Codegen-first polyglot web toolkit on a Rust core: OpenAPI/AsyncAPI/GraphQL/JSON-RPC/gRPC codegen, SQL-to-HTTP, tower-http middleware, and an MCP server. Experimental, pre-1.0. Dart bindings via flutter_rust_bridge with isolate-safe Future/Stream APIs.

Install · Quick example · Features · Docs

---

Important

spikard is experimental and pre-1.0. APIs change between releases and not every binding is at the same level of maturity, so it is not yet recommended for production. Feedback is genuinely wanted at this stage — open an issue if something is wrong, awkward, or missing.

What this package provides

• Flutter-compatible FFI — Dart 3.0+ with Future and Stream APIs

• Type-safe routing — HTTP definitions with path, query, body, and header validation across all bindings

• Spec-driven codegen — OpenAPI 3.0, AsyncAPI 3.0, GraphQL SDL, and JSON-RPC 2.0 support

• Cross-language parity — same DTOs, fixtures, and error model prevent runtime drift

• Tower middleware — compression, rate limiting, timeouts, auth (JWT/API key), static files

• Lifecycle hooks — onRequest, preValidation, preHandler, onResponse, onError

Installation

dart pub add spikard

System Requirements

• Dart 3.0+ required

Quick example

See the spikard repository for usage examples and guides.

Features

Feature	Support
Type-safe routing	Path, query, body, and header parameter validation
Request extraction	Typed structs for JSON, form data, multipart, and raw bodies
Spec support	OpenAPI 3.0 · AsyncAPI 3.0 · GraphQL SDL · JSON-RPC 2.0
Middleware	Compression, rate limiting, timeouts, authentication, static files
Lifecycle hooks	Request, pre-validation, pre-handler, response, and error hooks
WebSocket & SSE	Bidirectional streams and server-sent events
Error handling	Consistent error responses across all bindings via ProblemDetails
Fixture testing	Shared JSON fixtures for behavioral consistency across languages

Routing

See examples in the repository.

Validation

See examples in the repository.

Middleware & configuration

See examples in the repository.

Resources

• Repository — source code, examples, and issues
• Examples — working implementations in all supported languages
• Contributing — how to contribute

License

MIT License — see LICENSE for details.