Product Updates
Instantly Preview SDKs from your OpenAPI Spec
Adam Bull
May 14, 2025 - 3 min read
Speakeasy Sandbox is a browser-based playground that lets developers upload their OpenAPI spec, get immediate feedback / suggested improvements, and also preview how those OpenAPI specifications would look as production-ready SDKs.
With Sandbox, you can close the gap between designing a great API, and seeing how it would actually be used by SDK consumers.
Key Features
Here’s a few of the key features in Sandbox:
1. Validate and improve your API spec
Choose the “OpenAPI editor” layout to see improvement suggestions — e.g. syntax errors, type mismatches, duplicated enums, missing examples, and configuration recommendations.
2. Preview SDKs from any OpenAPI spec
Provide an OpenAPI specification and within seconds, you’ll see corresponding SDK code across multiple languages. Tweak the specification and the SDK code will update — enabling rapid SDK iteration.
3. Share and collaborate instantly
Every change updates the URL automatically, making it easy to share your OpenAPI spec and SDK previews with teammates, get feedback, or bookmark different iterations.
4. Take it to production
Ready to move beyond the preview? With a single click, you can sign up / login to Speakeasy to save your SDKs, configure CI/CD integration, and publish to package managers — all from your refined OpenAPI specification.
Why it matters
Crafting a great OpenAPI spec is difficult! It’s common to have specs of 30K lines or more with inconsistent parameter naming, missing request examples or parameter descriptions, and duplicate schema definitions.
The Speakeasy Sandbox experience is designed to give developers an easy way to rapidly iterate to a great OpenAPI spec.
More importantly, seeing the generated SDK alongside the specification aims to give developers immediate feedback on how OpenAPI specification changes impact real-world usability — so that the OpenAPI specification becomes more than just an academic artifact.
Best of all, you can start immediately — just paste your spec and go. No accounts, no CLI, no friction.
Benefits
- Instant Feedback: See how your OpenAPI spec translates to real SDK code in seconds
- Multi-language Support: Preview SDKs across TypeScript, Python, Go, Java, and more
- Real-time Updates: Changes to your spec immediately reflect in the generated SDK code
- Collaboration Ready: Share your work with teammates through automatically updated URLs
- Zero Setup: No installation, accounts, or configuration required to get started
- Production Path: Seamlessly transition from prototype to production-ready SDKs
Getting Started
Just go to sandbox.speakeasy.com and upload or provide a link to your OpenAPI specification!
Whether you’re:
- Designing a new API and want to see how it would feel to use
- Refining an existing spec and need quick feedback on changes
- Collaborating with teammates on API design decisions
- Learning about SDKs and want to experiment with different approaches
Speakeasy Sandbox provides an instant, friction-free way to bridge the gap between API design and real-world usage.