YAML to JSON — Free Online Converter
Overview
Most online converters require an account or upload your files to a server. This tool runs entirely in your browser — no file ever leaves your device. Paste YAML directly or drop a .yaml, .yml, or .json file. The output panel updates in real time as you type, with parse errors shown inline when the YAML is invalid.
How to Use This Tool
Open the tool, paste your YAML into the left panel, and read the formatted JSON on the right. No submit button, no spinner — conversion is immediate. Copy the output with one click or download it as a file.
Ready to get started? It's free, no registration required, and your files never leave your device.
PDF Tool →Frequently Asked Questions
Why does my YAML convert to null in JSON?
YAML allows empty documents and null values. If your YAML file is empty or contains only comments, yaml.load() returns null, which is serialized as the JSON string null. Check that your YAML has at least one key-value pair.
Does the tool support YAML anchors and aliases?
Yes. js-yaml resolves YAML anchors (&anchor) and aliases (*alias) during parsing. The resulting JSON will have the alias expanded to the full value of the anchor — JSON has no native anchor concept.
What browsers does this tool support?
Any modern browser with ES2020 support: Chrome 87+, Firefox 78+, Safari 14+, Edge 88+. The tool uses the Blob API for file downloads and FileReader for file drops — both are universally supported.