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JSON to YAML Converter

JSON → YAML
2 spaces

JSON Input

YAML Output

Free JSON to YAML Converter

Convert JSON to YAML and YAML to JSON instantly in your browser. Adjust indentation, validate as you type, and copy or download the result. No sign-up, nothing uploaded, nothing stored.

JSON and YAML, two ways to write the same data

JSON (JavaScript Object Notation) and YAML (YAML Ain't Markup Language) both describe structured data — objects, arrays, and scalar values. JSON is compact and ubiquitous in APIs and code, while YAML's indentation-based syntax is favoured for human-edited configuration in tools like Kubernetes, Docker Compose, and CI pipelines.

Because they model the same underlying structure, you can convert between them losslessly for ordinary data. This tool parses your input, then serialises it in the target format with the indentation you choose — entirely on your device.

Key Features

Bidirectional Conversion

Convert JSON to YAML or YAML to JSON with a single direction toggle — no manual reformatting.

JSON to YAML

Turn compact JSON objects and arrays into clean, readable YAML for config files and pipelines.

YAML to JSON

Parse YAML back into valid, pretty-printed JSON ready for APIs, tooling, and code.

Adjustable Indentation

Choose 2 or 4-space indentation to match the style your project and team already use.

Inline Validation

Invalid JSON or YAML is caught instantly with a clear error message — the tool never crashes.

100% Client-Side

Conversion runs entirely in your browser. Your data is never uploaded or stored.

How to Convert JSON and YAML

1

Pick a direction

Choose JSON → YAML or YAML → JSON from the direction selector above the panels.

2

Paste your source

Type or paste JSON or YAML into the input panel — it converts live as you go.

3

Set the indentation

Select 2 or 4-space indentation to format the output exactly how you want it.

4

Copy, download, or swap

Copy the output, download it as a .yaml or .json file, or hit Swap to convert it back the other way.

Common Use Cases

  • Kubernetes & CI configs: Convert JSON API responses into the YAML that Kubernetes, GitHub Actions, and CI pipelines expect.
  • API development: Turn YAML fixtures and OpenAPI snippets into JSON for requests, tests, and mock servers.
  • Config migration: Move settings between tools that prefer JSON and tools that prefer YAML without rewriting by hand.
  • Readability cleanup: Reformat dense JSON into YAML to make large configuration blocks easier to review and edit.
  • Documentation: Generate both JSON and YAML versions of an example payload to show in docs and READMEs.

Frequently Asked Questions

How do I convert JSON to YAML?

Keep the direction on JSON → YAML, paste your JSON into the input panel, and the YAML output appears instantly on the right. You can then copy it or download it as a .yaml file.

Can I convert YAML back to JSON?

Yes. Switch the direction to YAML → JSON, or click the Swap button to move the current output into the input and flip the direction. The tool parses the YAML and produces pretty-printed JSON.

Is my data uploaded to a server?

No. The conversion happens entirely in your browser using client-side JavaScript. Nothing you paste is sent to a server, logged, or stored.

What happens if my input is invalid?

If the JSON or YAML cannot be parsed, the tool shows a clear inline error message and a toast describing the problem, and the input is highlighted. It never crashes, and empty input simply produces empty output.

Can I control the indentation of the output?

Yes. Use the indent selector to choose 2 or 4 spaces. The setting applies to both YAML and JSON output so it matches your project's formatting conventions.

Does converting between JSON and YAML lose data?

For standard data — objects, arrays, strings, numbers, booleans, and null — the conversion round-trips cleanly. YAML-specific features such as anchors, comments, and custom tags are not preserved when converting to JSON.

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