YAML ↔ JSON Converter

Convert between YAML and JSON

YAML and JSON describe the same kinds of data — objects, arrays, strings, numbers, booleans — but in different syntaxes. This tool converts in either direction right in your browser: turn a JSON API payload into readable YAML, or turn a Kubernetes/CI YAML file into JSON for a tool that expects it. Parsing happens locally, so your config never leaves the page.

When you'll need this

• Pasting a JSON snippet into a Kubernetes manifest or GitHub Actions workflow that uses YAML.
• Feeding a YAML config into an API or library that only accepts JSON.
• Quickly reading a dense JSON object as indented YAML, or vice versa.
• Spotting a structural bug by viewing the same data in the other format.

YAML's strengths — and its traps

YAML is friendlier to write: no braces, comments are allowed, and indentation shows structure. But that indentation is significant, and mixing tabs with spaces (YAML forbids tabs for indentation) is a classic source of errors. The infamous "Norway problem" is another: unquoted no, yes, on and off can be interpreted as booleans, and an unquoted country code NO may become false. When in doubt, quote your strings. This converter surfaces parse errors so these issues don't slip through silently.

What's preserved (and what isn't)

Standard scalars, mappings and sequences round-trip cleanly. Note that JSON has no comments, so converting YAML → JSON drops any # comments. YAML anchors and aliases are expanded on conversion. Key order is generally preserved, which keeps diffs readable.

Pair it with these

After converting to JSON, tidy it up with the JSON formatter. Scheduling a job from your config? Decode the schedule with the cron explainer.