JSON ↔ YAML Converter
Convert between JSON and YAML formats. Perfect for Kubernetes configs, CI/CD pipelines, and configuration files.
About JSON ↔ YAML Conversion
- JSON (JavaScript Object Notation) — strict syntax with quoted keys, used for APIs and data exchange.
- YAML (YAML Ain't Markup Language) — human-friendly format using indentation, popular for configs (Kubernetes, Docker Compose, GitHub Actions, etc.).
- Swap button carries output to input for round-trip conversion.
- Sample data uses a Kubernetes Deployment manifest — a real-world use case for this tool.
- Everything runs in your browser — no data is sent over the network.
How to Convert YAML to JSON
YAML is the dominant configuration language in the cloud-native ecosystem, but many APIs, libraries, and programming languages expect JSON. This free online YAML to JSON converter parses your YAML instantly and produces valid, properly formatted JSON — entirely in your browser with zero server-side processing.
Why Convert YAML to JSON?
JSON is the universal data interchange format. While YAML excels as a human-readable configuration language, JSON is required when interacting with REST APIs, storing structured data in databases, processing configurations programmatically in JavaScript or Python, or working with tools that only accept JSON input. Converting YAML to JSON is also useful for debugging — JSON's explicit syntax makes it easier to spot structural issues that YAML's indentation-based format can hide.
Modern infrastructure tools like Kubernetes accept both YAML and JSON for manifests, but the kubectl API server returns JSON. If you need to diff, validate, or programmatically modify Kubernetes resources, converting your YAML manifests to JSON first simplifies the process. Similarly, AWS CloudFormation historically required JSON templates, and many linting and validation tools work better with JSON input.
Common Use Cases
- API integration: Convert YAML configs to JSON for REST API requests or responses that require JSON format.
- Kubernetes debugging: Parse Kubernetes YAML manifests into JSON for programmatic processing with jq, Python, or JavaScript.
- Configuration migration: Transform YAML configs into JSON for tools and frameworks that only support JSON configuration files.
- Data processing: Load YAML data files into JSON-based data pipelines, databases, or analytics tools.
- Validation and linting: Convert YAML to JSON to use with JSON Schema validators, JSON linters, and structural validation tools.
- AWS CloudFormation: Transform YAML templates to JSON when working with older tools or APIs that require JSON format.
YAML Features This Converter Handles
This converter supports the full YAML 1.2 specification including nested mappings and sequences, flow style (inline JSON-like syntax), block scalars (literal | and folded > blocks), anchors (&) and aliases (*) with merge keys (<<), tagged values, multiple documents separated by ---, and all scalar types (strings, integers, floats, booleans, nulls, timestamps). The output is valid JSON with configurable indentation for readability.
Privacy First
This YAML to JSON converter runs entirely in your browser using the js-yaml library. Your configuration files, manifests, and data never leave your device — no API calls, no server processing, no data retention. This makes it safe for sensitive infrastructure configs, credentials, and internal service definitions.