YAML ↔ JSON Converter & Validator

Convert YAML to JSON and JSON to YAML, format and validate YAML with a safe schema (it never instantiates classes or runs custom tags), detect duplicate keys, excessive depth, and out-of-limit alias expansion, and offer to preserve as text or reject integers outside JSON's safe range instead of silently losing precision. It explains which YAML elements (comments, anchors, aliases) can't be meaningfully represented in JSON.

Processed on your device, no AIhasta 2.000.000 de caracteres, hasta 50.000 líneas

Data is processed on your device and never sent to any server.

Indent (JSON)

Integers outside safe range

Minify output JSON Sort keys alphabetically Allow multiple YAML documents (separated by "---")

YAML input

or upload a .yaml, .yml, or .json file

The data is processed on your device and is never sent to the server.

Use cases

Convert a YAML config file to JSON for an API
Validate that a YAML file is well-formed before using it
Convert JSON to YAML for a more readable config file

How to use this tool

Paste or upload the YAML or JSON
Choose the conversion direction and options
Copy or download the result

Frequently asked questions

Can it run code through YAML tags?

No. It uses a safe schema that only produces plain data (objects, lists, text, numbers); it never instantiates classes or runs custom tags.

Does the JSON conversion keep all of the original YAML?

Not always. JSON has no comments, anchors, aliases, or all of YAML's special types; the tool explicitly tells you what's lost in each conversion.

Related tools

JSON Formatter & Validator

TOML ↔ JSON Converter & Validator

CSV ↔ JSON Converter

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