JSON to YAML 100% local
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Paste JSON or open .json, then copy readable YAML for configs.
Input
YAML or JSON input

Drop a YAML or JSON file here

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Supports .yaml, .yml, and .json files

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JSON to YAML converter

Convert JSON to YAML locally in your browser.

MarkDone turns JSON into clean, readable YAML for Docker Compose files, Kubernetes manifests, GitHub Actions workflows, and other config authoring. The conversion runs on your device, so API payloads and internal data are never uploaded to a server.

Readable outputClean 2-space YAML that is easy to review and diff.
Config authoringTurn JSON examples into Compose, Kubernetes, and CI snippets.
Private by designAPI responses and payloads never leave your browser.
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How to convert JSON to YAML

  1. Paste valid JSON or open a .json file.
  2. MarkDone detects JSON and previews readable YAML output.
  3. Copy or download the YAML for Compose files, manifests, or workflows.

From API payload to config file

JSON from API docs, responses, and exports rarely matches the YAML your tooling expects. Convert it once and paste the result straight into docker-compose.yml, a Kubernetes manifest, or a GitHub Actions workflow.

Easier reviews and diffs

YAML reads better in pull requests and documentation than dense JSON. MarkDone validates the JSON locally first, so private payloads never leave your machine to become readable.

Is my JSON uploaded when I convert it to YAML?

No. JSON to YAML conversion runs locally in your browser. API payloads and internal data stay on your device.

How is the YAML output formatted?

The output uses 2-space indentation and quotes values only where YAML requires it, so it is ready for Compose files, manifests, and workflows.

Does the converter validate my JSON first?

Yes. The JSON is parsed in your browser before conversion and you get a clear error if the input is not valid JSON.

Can I convert YAML back to JSON?

Yes. Paste YAML into the editor and MarkDone turns it back into formatted JSON — or use the dedicated YAML to JSON converter for that workflow.

Why convert JSON to YAML at all?

YAML is easier to read and review than JSON, and it is the required format for Docker Compose, Kubernetes, GitHub Actions, and most CI configuration.