OpenAPI YAML to JSON Converter - Swagger Converter Tool
Convert OpenAPI 3.0/3.1 and Swagger 2.0 specifications between YAML and JSON formats instantly
YAML
JSON
About OpenAPI YAML to JSON Converter
This free online OpenAPI YAML to JSON converter helps developers quickly convert between YAML and JSON formats for their API specifications. Whether you're working with OpenAPI 3.0, OpenAPI 3.1, or Swagger 2.0 specifications, our tool handles the conversion seamlessly.
Key Features
- Instant Conversion: Convert Swagger YAML to JSON or JSON to YML in real-time
- OpenAPI Validation: Automatically validates your OpenAPI and Swagger specifications
- Multiple Input Methods: Paste content, upload files, or fetch from URLs
- Format Support: Full support for OpenAPI 3.0, 3.1, and Swagger 2.0 formats
- Smart Detection: Automatically detects whether your input is YAML or JSON
- Free & Private: No registration required, all processing happens in your browser
How to Convert OpenAPI YAML to JSON
- Input your content: Paste your OpenAPI YAML directly, upload a .yaml file, or fetch from a URL
- Automatic conversion: The tool instantly converts YAML to JSON format
- Validation: Check for any OpenAPI specification errors in the validation panel
- Copy or download: Use the copy button to get your converted JSON
How to Convert Swagger JSON to YAML
- Paste JSON: Input your Swagger or OpenAPI JSON specification
- Instant YAML output: See your JSON converted to YAML format immediately
- Customize output: Adjust indentation and key sorting preferences
- Export: Copy the YAML output for use in your projects
Supported Formats
Our converter supports all major API specification formats:
- OpenAPI 3.1 - The latest OpenAPI Specification
- OpenAPI 3.0 - Widely adopted API specification format
- Swagger 2.0 - Legacy Swagger specifications
- AsyncAPI - Event-driven API specifications
Why Convert Between YAML and JSON?
YAML format is human-readable and easier to edit manually, making it perfect for API design and documentation. JSON format is more compact and better for programmatic processing and API tooling. Many developers need to convert between these formats when:
- Integrating with different API tools and platforms
- Collaborating with teams using different format preferences
- Optimizing file size for production deployments
- Working with CI/CD pipelines that require specific formats
Common Use Cases
API Documentation
Convert your OpenAPI specifications to the format required by documentation tools like Swagger UI, Redoc, or Postman.
API Gateway Configuration
Many API gateways require specifications in specific formats. Convert your Swagger or OpenAPI files to match gateway requirements.
Version Control
YAML is more diff-friendly for version control. Convert JSON specs to YAML before committing to Git.
API Testing
Convert specifications to the format required by your API testing tools and frameworks.
Frequently Asked Questions
Is this OpenAPI converter free to use?
Yes, our OpenAPI YAML to JSON converter is completely free. No registration or payment required.
Does the converter support Swagger 2.0?
Yes, we support Swagger 2.0 (now known as OpenAPI 2.0) along with OpenAPI 3.0 and 3.1.
Is my API specification data secure?
Absolutely. All conversion happens locally in your browser. Your API specifications never leave your device.
Can I convert large OpenAPI files?
Yes, the converter handles large specifications efficiently. The browser-based processing means no upload limits.
What's the difference between OpenAPI and Swagger?
Swagger was renamed to OpenAPI in 2016. Swagger 2.0 became OpenAPI 2.0, followed by OpenAPI 3.0 and 3.1.
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