YAML to JSON 100% local
Batch convertPro
Paste YAML or open .yaml, then copy clean JSON for scripts and APIs.
Input
YAML or JSON input

Drop a YAML or JSON file here

or click here to choose a file

Supports .yaml, .yml, and .json files

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documents converted worldwide Your files never leave your browser. Only an anonymous +1 is counted, never your documents.

YAML to JSON converter

Convert YAML to JSON locally in your browser.

MarkDone parses YAML and outputs clean, formatted JSON for scripts, APIs, jq pipelines, and debugging. The conversion runs on your device, so config files with secrets, tokens, or internal endpoints are never uploaded to a server.

Real YAML supportAnchors, aliases, block scalars, and nested lists parse correctly.
Instant validationSyntax errors show up while you type, before a broken config ships.
Secrets stay localCI configs, manifests, and tokens never leave your browser.
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How to convert YAML to JSON

  1. Paste YAML or open a .yaml or .yml file.
  2. MarkDone detects YAML and previews formatted JSON output.
  3. Copy or download the JSON for scripts, APIs, or jq pipelines.

Built for config files

GitHub Actions workflows, Docker Compose files, Kubernetes manifests, and CI pipelines are written in YAML. Converting them to JSON makes the same data usable in scripts, REST calls, and tools that expect JSON.

Debug YAML without pasting secrets online

Indentation mistakes are the most common YAML bug. MarkDone parses the file locally and shows the resulting structure or a clear error, so configs containing credentials never touch a third-party server.

Is my YAML uploaded when I convert it to JSON?

No. YAML to JSON conversion runs locally in your browser. Config files and structured data stay on your device.

Does the converter support anchors, aliases, and multiline strings?

Yes. The parser handles YAML anchors, aliases, block scalars, and nested structures, so real-world config files convert correctly.

Can I use it to find errors in my YAML?

Yes. The YAML is parsed in your browser and syntax errors are flagged immediately, which makes it useful for debugging indentation issues.

Can I convert JSON back to YAML?

Yes. MarkDone supports both directions. For the reverse workflow there is a dedicated JSON to YAML converter.

Which file types are supported?

You can open or drop .yaml, .yml, and .json files, or simply paste the content into the editor.