YAML ↔ JSON Converter — Free Online Format Converter
Convert between YAML and JSON instantly. Paste your data on one side, get the converted output on the other. Perfect for Kubernetes configs, CI/CD pipelines, and API integrations. 100% client-side — your data never leaves your browser.
How to Use the YAML ↔ JSON Converter
- Paste your YAML in the left panel — it auto-detects and converts as you type.
- Drag & drop a
.yaml,.yml, or.jsonfile onto the input area. - Read the JSON output on the right — formatted with syntax highlighting.
- Click "Copy Output" to grab the result for your clipboard.
- Click the swap button to convert JSON back to YAML.
- Adjust indent with the dropdown to control YAML output spacing.
- Download the output as a
.yamlor.jsonfile.
Why Use This YAML ↔ JSON Converter
YAML and JSON are the two most common data serialization formats in modern development, but they don't always play nicely together. Kubernetes manifests are YAML, but most APIs expect JSON. CI/CD configs like GitHub Actions use YAML, but debugging tools often output JSON. This converter bridges that gap instantly — no installing packages, no writing conversion scripts.
It's especially useful when you're debugging a malformed YAML config and need to see the equivalent JSON structure, or when you're migrating configuration files between tools that use different formats.
Frequently Asked Questions
Common YAML issues: inconsistent indentation (use spaces, not tabs), missing spaces after colons, or unquoted strings containing special characters like : or #. YAML is sensitive about formatting — even one tab instead of spaces will break it.
Almost. YAML supports everything JSON does plus extras like comments (# this is a comment), multi-line strings, and anchors/aliases for reusing values. However, YAML doesn't support trailing commas, which JSON5 does. This converter handles standard YAML and JSON only.
Yes — paste multi-document YAML (separated by ---) and it will convert each document as a JSON array. For complex manifests with nested resources, the JSON output preserves the full structure. Note that YAML comments will be stripped during conversion since JSON doesn't support them.
Use Cases
API Payload Conversion
Convert YAML to JSON for API payloads when REST APIs require JSON input but your configuration files are in YAML format.
Config Readability
Transform JSON configs to YAML for readability when you need a more human-friendly format for documentation and editing.
Format Migration
Migrate between configuration formats when switching tools or platforms that require different data serialization formats.
K8s Manifest Convert
Convert Kubernetes manifests between YAML and JSON for compatibility with different deployment tools and CI/CD systems.
Data Transformation
Transform data for different tools by converting between YAML and JSON formats for import, export, and integration.