YAML to JSON Converter
Paste YAML or drop a .yml file to get formatted JSON instantly. Validates as you type and points to the exact line of any error, entirely in your browser.
Converted on your device. Your data never leaves your browser.
How to convert YAML to JSON
- 1
Paste your YAML into the input box, drop a .yaml or .yml file onto it, or press Open file.
- 2
Choose 2 spaces, 4 spaces or minified output.
- 3
Copy the JSON or press Download .json.
Why use this YAML to JSON converter
Line-accurate errors
Indentation mistakes and other YAML errors are reported with the line number, so it doubles as a YAML validator.
Full YAML support
Anchors, aliases, merge keys, multi-line strings and comments are all handled.
Multi-document files
Files with several documents separated by --- become a JSON array, one item per document.
Private and instant
Conversion happens in your browser, so API keys and secrets in your configs never leave your device.
Popular uses for the YAML to JSON converter
Use configs in code
Load YAML settings in tools and languages that expect JSON.
Validate YAML
Errors show exactly where indentation or syntax breaks.
Convert Kubernetes and Helm files
Get JSON for APIs and scripts.
OpenAPI specs
Convert YAML API definitions into JSON.
Also known as: YAML to JSON converter, YML to JSON, YAML parser online and YAML validator.
People also search for
- convert yaml to json online
- yml to json converter free
- kubernetes yaml to json
- docker compose yaml to json
- validate yaml by converting to json
A fast browser file utility for data
Convert CSV, JSON and YAML, or encode images as Base64, with a free online file converter that needs no install. It's a client-side file converter, so private data, exports and API keys stay on your device instead of being sent to a server.
Frequently asked questions
How do I validate a YAML file?
Paste it into the converter. If it converts, it's valid YAML; if not, you'll see the error and the line number where the problem is.
What happens to YAML comments?
JSON has no comments, so they're dropped from the output. Everything else, including anchors and aliases, is resolved into plain JSON values.
How are multiple YAML documents converted?
A file with several documents separated by --- becomes a JSON array with one element per document. A single document becomes a single JSON value.
Are my files uploaded to a server?
No. Conversion runs entirely in your browser via client-side JavaScript, on your own device. Your files never touch a remote server and nothing is stored, so it's a secure, private, no-upload tool for personal photos and confidential data, and it keeps working on slow connections.