YAML to JSON Converter

How to use YAML to JSON Converter

1. Paste YAML or upload a .yaml/.yml file.
2. Choose the indent size.
3. Copy or download the JSON.

YAML and JSON compared

YAML is a superset of JSON in spirit: every JSON document can be expressed in YAML, but YAML adds comments, anchors, multi-line strings and a cleaner syntax. That is why configuration tools such as Kubernetes, Docker Compose, Ansible and CI systems prefer it, while web APIs prefer the stricter JSON.

Typical conversions

• Feed a YAML config to a script or API that expects JSON.
• Check what a YAML file really parses to, including types.
• Validate YAML syntax before committing.
• Migrate settings from YAML into a JSON-only system.

Gotchas

YAML guesses types: unquoted yes/no may become booleans, 0123 may become a number, and dates may be parsed as dates. If you need a literal string, put it in quotes. Duplicate keys and tab indentation are errors. Always review the JSON output for values that were typed differently than you intended.

Reading the converted result

Check the JSON for values that YAML interpreted as other types. In YAML 1.1 parsers, words such as yes, no, on and off can become booleans, and a value like 1e3 can become a number. This converter follows the YAML 1.2 core schema used by js-yaml, where only true and false are booleans.

Multi-line strings written with | or > in YAML become single JSON strings with newline characters. Anchors and aliases (&name and *name) are expanded, so shared sections appear repeated in the JSON output.

Why use this yaml to json converter tool

• Parses real-world YAML. Anchors, lists, nested maps and multi-line strings.
• Clear errors. Tells you the line of a syntax problem.
• Private. Nothing leaves your browser.

Frequently asked questions

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