Ariadne
Python GraphQL library using SDL-first (Schema Definition Language) approach. Write your schema in .graphql files, then bind Python resolvers to it. Unlike Strawberry (code-first), Ariadne starts with the GraphQL SDL as source of truth. Supports Django, ASGI (Starlette/FastAPI), WSGI, and async resolvers. Developed by Mirumee Studio with a focus on SDL-first schema design principles.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
SDL-first approach reduces risk of accidental field exposure. Context injection for auth. Query complexity limits require separate implementation. BSD licensed.
⚡ Reliability
Best When
You prefer SDL-first GraphQL where schema files are the source of truth and resolvers are separate Python functions bound to the schema.
Avoid When
You want Python type annotations to drive schema generation — use Strawberry. SDL-first means schema and Python code must be kept in sync manually.
Use Cases
- • Build Python GraphQL APIs where the schema is the contract — SDL files define the API before implementation, enabling frontend/backend parallel development
- • Generate Python GraphQL resolvers from existing SDL schema files in API-first development workflows
- • Integrate GraphQL into Django or FastAPI backends with a clean separation between schema definition (SDL) and resolver logic (Python)
- • Implement GraphQL APIs where the schema is shared between multiple clients or teams as the authoritative contract
- • Add file upload support to Python GraphQL APIs using Ariadne's built-in multipart file upload handling
Not For
- • Code-first GraphQL development — use Strawberry for Python code-first with type hints and dataclasses
- • Teams without GraphQL SDL expertise — Strawberry's code-first approach has a gentler learning curve for Python developers
- • Complex authorization at resolver level — Strawberry's permission classes are more ergonomic
Interface
Authentication
Authentication handled by underlying framework. Ariadne passes context to resolvers — auth info from Django request or FastAPI dependency injection.
Pricing
BSD-licensed open source library.
Agent Metadata
Known Gotchas
- ⚠ SDL schema and Python resolvers must stay in sync manually — adding a field to SDL without a resolver causes runtime 'field not resolved' errors unless default_field_resolver handles it
- ⚠ make_executable_schema() must be called at startup with all type definitions and resolvers — modular schema construction requires explicit type_defs and resolvers merging
- ⚠ Subscriptions require an async transport (ASGI WebSocket) — Ariadne's subscription support needs Starlette/FastAPI/Django Channels; pure WSGI doesn't support subscriptions
- ⚠ File uploads require multipart request handling — must use ariadne's FileUpload scalar and configure ASGI middleware; not supported in standard JSON GraphQL requests
- ⚠ Custom scalars require both SDL declaration and Python serialize/parse_value functions — forgetting either causes GraphQL schema errors
- ⚠ GraphQL query complexity and depth limits are not built-in — require third-party middleware or custom directives to prevent abuse
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Ariadne.
Scores are editorial opinions as of 2026-03-06.