YAML ↔ JSON Converter
Convert YAML to JSON and JSON to YAML instantly, with syntax validation and adjustable indentation. Free, private, and fully client-side.
YAML to JSON Converter converts YAML documents to JSON and JSON back to YAML directly in your browser. It validates syntax as you convert, lets you choose 2 or 4-space indentation, and lets you copy or download the result. No upload, no account. Made by FreeToolHub.
YAML Input
JSON Output
JSON Input
YAML Output
Convert between YAML and JSON instantly in your browser.
Frequently Asked Questions
What is the difference between YAML and JSON?
YAML and JSON both represent structured data, but YAML uses indentation and minimal punctuation for a human-friendly, comment-capable format often used in config files (Docker Compose, Kubernetes, CI pipelines), while JSON uses braces and brackets and is the standard format for APIs and web applications.
Is my YAML or JSON data uploaded anywhere?
No. All parsing and conversion happens locally in your browser using JavaScript. Your data is never sent to any server, so private configuration files and API payloads stay private.
What YAML features are supported?
This tool supports the full YAML 1.2 syntax via the js-yaml library: nested mappings and sequences, block and flow styles, strings, numbers, booleans, and null. Comments are valid in YAML input but, like JSON, have no equivalent in the converted output, so they are not preserved.
Why does my conversion fail with a syntax error?
YAML is indentation-sensitive, so mixed tabs and spaces or misaligned list items are the most common cause. JSON requires double-quoted keys and no trailing commas. The error message includes the line and column where the parser stopped, which pinpoints the issue.
Can I convert nested JSON objects and arrays back to YAML?
Yes. Nested objects become nested YAML mappings and arrays become YAML sequences, at any depth, with a choice of 2 or 4-space indentation for the output.
Is this converter free to use?
Yes, this YAML to JSON converter is 100% free with no limits, no sign-up, and no ads.