Pick JSON → YAML or YAML → JSON
Tabs switch labels, placeholders, and which file types the uploader suggests.
JSON ↔ YAML Converter
Switch between JSON and YAML for configs, CI files, and API samples. Pick a direction, paste or upload, then copy or download. Uses js-yaml (MIT) bundled on this page—nothing is sent to a server. For JSON-only formatting, use the JSON formatter.
Or upload a JSON file
Max 10 MB UTF-8 · processed locally
Output
Output
Runs only in your browser. Includes bundled js-yaml (MIT).
HOW IT WORKS
How to convert JSON and YAML online
Choose a direction, validate input with Convert, then copy or download the other format.
Paste or upload
Stay under the size limit. JSON must be valid; YAML must parse as a single document.
Convert and export
Adjust indent for output, then copy or download .yaml or .json.
Why use this tool
Why Use a JSON ↔ YAML Converter?
Teams mix JSON (APIs, package files) and YAML (Kubernetes, GitHub Actions, Ansible). A quick converter avoids context-switching to the command line.
Config and CI pipelines
Turn JSON samples into readable YAML snippets—or flatten YAML to JSON for tools that only accept JSON.
No CLI required
Paste from Slack, docs, or logs and get the other format without installing yq or jq.
Explicit errors
Invalid JSON or YAML surfaces the parser message so you can fix commas, quotes, or indentation.
Controlled output shape
Choose 2- or 4-space indentation for both YAML dumps and pretty-printed JSON.
Privacy
Private and Secure
Conversion runs entirely in your browser. Text and files are not uploaded, logged, or stored on any server.
Local processing
js-yaml executes in your tab only; your data never leaves the device.
No account or API
No keys, quotas, or backend—just static pages and scripts.
Size limits on purpose
Large pastes are rejected to reduce memory pressure and keep the tab responsive.
FAQ
Frequently asked questions
About 10 MB of UTF-8 text per paste or file, similar to other JSON tools on this site. Bigger documents may still exhaust memory on low-end devices.
No. The converter expects a single YAML document (one stream). Split multi-document files or use only the first document.
JSON only has data types JSON supports. YAML dates, binary, and other tags are converted to the nearest JSON representation; going back to YAML may look different but stay data-equivalent where possible.
No. Parsing and dumping run in your browser; the bundled js-yaml library is loaded with the page, not from a remote API call for your content.
The formatter prettifies or minifies JSON only. Here you change the serialization format between JSON and YAML.