Capabilities
Move fast and break nothing with type safety
Fine-tune SDK resources and method names
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Fail fast if payloads diverge from your schema
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Fern SDKs include support for discriminated unions
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SDKs that handle multipart form data
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SDKs that are fault-tolerant as your API evolves
Fern will automatically publish your SDKs to registries like npm, PyPI, and Maven
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Paginate through API responses easily with offset, cursor, and link-based pagination.
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Fern supports OAuth as a first class citizen
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Automatically retry failed requests with exponential backoff
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Verify the signature of incoming webhook requests
Built-in protection against duplicate submissions
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Stream JSON data from your server to your client (i.e. chat completions)
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Auto-generated and handwritten tests to ensure your SDK works in production
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No longer depend on manually written code snippets
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Extend the generated SDK to provide additional functionality
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Multiple API Definitions. One SDK.
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Send and receive messages over WebSockets
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Fern can generate a Model Context Protocol (MCP) server that augments your SDK.
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