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YAML ↔ JSON Converter
Input (YAML or JSON)
Output
Paste YAML or JSON and click convert

Free Online YAML to JSON Converter

Convert YAML to JSON or JSON to YAML instantly in your browser. No upload, no server, fully private.

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Bidirectional

Convert YAML to JSON for API payloads and data interchange, or JSON to YAML for configuration files and Kubernetes manifests. Both directions in one tool.

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Validation Included

If your input is invalid YAML or JSON, an error message tells you what went wrong. You see the problem immediately without debugging silently broken configs.

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Pretty Output

JSON output is always indented with 2 spaces. YAML output uses standard 2-space indentation consistent with most linting and formatting tools.

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Private

Config files often contain secrets. This converter runs entirely in your browser — your API keys, passwords and environment variables never leave your device.

Frequently Asked Questions

What is YAML?
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YAML (YAML Ain't Markup Language) is a human-readable data serialisation format commonly used for configuration files — Kubernetes manifests, Docker Compose, GitHub Actions, Ansible playbooks and many more.
When should I use YAML vs JSON?
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Use YAML for configuration files that humans edit — it supports comments and is more readable. Use JSON for API payloads and data interchange — it is more widely supported by programming languages and has no ambiguity.
Does this handle nested YAML?
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The converter handles flat structures and one level of nesting including arrays. For deeply nested YAML with complex anchors or references, a full YAML parser in your development environment is recommended.
Can I convert Kubernetes YAML to JSON?
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Yes — paste your Kubernetes manifest YAML and click YAML to JSON. Note that Kubernetes uses multiple documents in a single file (separated by ---) which you will need to convert one document at a time.
Is my config file data private?
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Yes — everything runs in your browser. Config files containing secrets, API keys and database URLs never leave your device.
What indentation does the YAML output use?
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Output YAML uses 2-space indentation, which is the most widely accepted convention for YAML and is compatible with all major YAML parsers.