Fern: Streamlining API Development with Automated SDK Generation

Fern: Streamlining API Development with Automated SDK Generation

In today's fast-paced digital landscape, building robust APIs is essential for businesses to provide seamless integration with their services and enable developers to create innovative applications. However, the process of writing and maintaining API code across multiple platforms and documentation can be time-consuming and error-prone. Recognizing this challenge, Fern, a San Francisco-based startup founded in 2022, offers a solution to automate the generation of SDKs (Software Development Kits) for APIs. In this article, we will explore how Fern simplifies API development, saves valuable time, and enhances the overall developer experience.

The Pain of Repetitive API Development

The Dilemma Faced by Engineering Teams
Writing API code often involves repetitive tasks, such as defining types, implementing networking logic, and updating documentation. This process is typically duplicated across backend and frontend environments, as well as in client libraries and documentation. This redundancy not only consumes significant time and effort but also increases the likelihood of errors and inconsistencies.

Introducing Fern - Building APIs Twice as Fast

Empowering Developers with SDK Generation
Fern addresses the challenges of API development by offering an innovative solution: automated SDK generation. By defining the API schema in OpenAPI or Fern's platform, developers can automatically generate idiomatic wrappers in popular programming languages such as Node/TypeScript, Python, Java, and Go. This approach eliminates the need to rewrite code across various platforms, significantly accelerating the development process.

Simplifying API Documentation and Integration
In addition to generating SDKs, Fern streamlines API documentation by automatically syncing it with the preferred provider. This ensures that developers have up-to-date and accurate information about API endpoints and usage. Furthermore, Fern generates a comprehensive Postman Collection, including examples of successful and unsuccessful requests, facilitating integration and testing.

Ensuring Consistency with Server-Side Validation
Fern goes beyond SDK generation and documentation by incorporating server-side validation. This feature ensures that the API serves exactly what was promised, reducing the risk of runtime errors and discrepancies. By enforcing consistency throughout the API implementation, Fern enhances reliability and provides a seamless experience for developers and end-users.

Founders and Their Vision

Danny Sheridan - CEO and Product Expertise
Leading Fern's team is Danny Sheridan, a seasoned product manager who previously worked at AWS. With his experience in both product management and founding and scaling an e-commerce business, Danny brings a wealth of knowledge to Fern's mission of revolutionizing API development.

Zach Kirsch - Software Engineering Expert
Zach Kirsch, a software engineer with experience at Palantir, is another key member of Fern's founding team. With a strong background in software development, Zach contributes his expertise in building scalable and reliable systems to drive Fern's technological advancements.

Deep Singhvi - YAML Engineering Specialist
Deep Singhvi, a YAML engineer, focuses on Fern's API generation capabilities. With his experience in data integration for the Department of Defense and the US Army, Deep ensures that Fern's platform is robust, efficient, and capable of meeting the diverse needs of API developers.

Transforming API Development with Fern

Streamlining Development Workflows
By automating the generation of SDKs, API documentation, and server code, Fern empowers engineering teams to focus on core functionalities and innovation rather than repetitive tasks. This streamlined workflow allows developers to build APIs twice as fast, significantly reducing time-to-market for new features and services.

Eliminating Inconsistencies and Errors
With Fern, the risk of inconsistencies and errors caused by multiple sources of truth is virtually eliminated. By generating SDKs, documentation, and server code from a single API schema, Fern ensures that all components remain in sync. This eliminates the need for manual updates and reduces the chances of runtime bugs, saving valuable debugging time and improving overall code quality.

Enhancing Developer Experience and Collaboration
Fern's automated approach to API development fosters a more positive and efficient experience for developers. By providing easy-to-use SDKs in popular programming languages, Fern enables developers to integrate APIs seamlessly into their applications. This eliminates the need to spend time understanding complex API specifications and allows developers to focus on building innovative solutions.

Furthermore, Fern's comprehensive API documentation, which automatically syncs with the preferred provider, ensures that developers have access to accurate and up-to-date information. This facilitates collaboration within development teams, as everyone can refer to a single source of truth when working on different aspects of the API.

Simplifying API Consumption
With Fern's API registry, developers no longer need to rely on communication platforms like Slack to understand how to consume an API. The registry houses all versions of the API, providing a centralized location where developers can easily discover and access the required resources. This streamlined process saves time and reduces dependency on manual communication, enabling teams to work independently and efficiently.

Unlocking Efficiency and Accelerating Innovation

Time Savings and Resource Optimization
Fern's automated SDK generation significantly reduces the time and effort required to build and maintain APIs. By eliminating repetitive coding tasks, developers can focus on higher-value activities such as improving functionality, addressing customer needs, and exploring new features. This time savings translates into increased productivity and accelerated innovation within engineering teams.

Improved Code Quality and Consistency
With Fern's automated approach, the risk of introducing errors and inconsistencies across different codebases is minimized. The generated SDKs follow idiomatic patterns and best practices for each programming language, ensuring high-quality and reliable code. This consistency not only reduces the likelihood of bugs but also makes it easier for developers to understand and work with the API.

Flexibility and Scalability
Fern's platform supports a wide range of programming languages, including Node/TypeScript, Python, Java, and Go. This flexibility allows development teams to choose the language that best suits their needs and preferences. Additionally, as the platform generates code based on the API schema, it can easily accommodate changes and updates to the API without requiring extensive manual modifications. This scalability ensures that APIs can evolve and adapt to the changing needs of businesses and their customers.


Fern's innovative approach to API development, centered around automated SDK generation, offers a transformative solution for engineering teams. By simplifying the process of writing and maintaining API code, Fern enables developers to build APIs twice as fast, while ensuring consistency, reducing errors, and enhancing collaboration. With Fern, businesses can optimize their development workflows, accelerate innovation, and provide developers with a seamless and efficient experience. As API-driven applications continue to proliferate, Fern's contribution to streamlining API development is poised to have a significant impact on the industry.