JSON ⇔ YAML Converter

What is JSON ⇔ YAML?

JSON ⇔ YAML is a tool that converts bidirectionally between JSON and YAML (YAML Ain't Markup Language). YAML is a human-readable data serialization format widely used in configuration files for Docker Compose, Kubernetes, and CI/CD pipelines (GitHub Actions, etc.). Since both JSON and YAML can represent the same data structures, bidirectional conversion is possible.

See also: JSON Formatter · JSON ⇔ CSV · JSON Diff

How to Use

1. Select conversion direction (JSON→YAML / YAML→JSON) with tabs
2. Paste data into the input area
3. Click 'Convert' button

Usage Examples

Input (JSON):
{"database": {"host": "localhost", "port": 5432}}

YAML output:
database:
  host: localhost
  port: 5432

Practical use: Convert Docker Compose config from YAML to JSON for API use / Convert API response JSON to Kubernetes YAML manifests

FAQ

Does it support YAML 1.2?

Yes. It uses the js-yaml library which supports YAML 1.2.

What happens to YAML comments?

YAML comments cannot be represented in JSON and are lost. JSON→YAML conversion does not generate comments.

Are multi-line strings correctly converted?

Yes. Long strings are output in YAML literal block style (|).

Can I use it for Kubernetes configuration files?

Yes. Kubernetes manifests are in YAML format, so YAML generated by JSON→YAML conversion can be used directly.

Is my data sent to a server?

No. All processing happens entirely in your browser. Sensitive data is safe.

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