JSON to YAML

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Convert JSON ↔ YAML instantly

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How to Use JSON to YAML

  1. 1Choose direction (JSON→YAML or YAML→JSON)
  2. 2Paste your input
  3. 3Click Convert
  4. 4Copy the result

About JSON to YAML

JSON to YAML Converter is a bidirectional tool that converts JSON to YAML and YAML back to JSON instantly in your browser. YAML (YAML Ain't Markup Language) is a human-readable data format widely used for configuration files in DevOps, Kubernetes, Docker Compose, GitHub Actions, and many other tools.

Converting between JSON and YAML is a common task for developers managing infrastructure-as-code, application configurations, and API definitions. Rather than manually reformatting data, this tool handles the full conversion including nested objects, arrays, multiline strings, and proper YAML indentation.

All conversion runs locally in your browser with no server required. Select the conversion direction, paste your data, and get the result instantly.

Key Features of JSON to YAML

  • Bidirectional conversion: JSON → YAML and YAML → JSON
  • Handles nested objects, arrays, strings, numbers, and booleans
  • Produces properly indented, human-readable YAML output
  • Supports multiline strings in YAML (block scalars)
  • Validates JSON input before converting
  • Works entirely in-browser — no server uploads
  • One-click copy of the converted output
  • Ideal for Kubernetes, Docker Compose, and GitHub Actions config files

Supported Formats

Input Formats

JSON objects and arraysYAML files and snippets

Output Formats

Formatted YAMLFormatted JSON

YAML comments are not preserved when converting YAML → JSON, as JSON has no comment syntax.

Examples

Convert a JSON config to YAML for a Kubernetes deployment

Transform a JSON application config into YAML format for use in a Kubernetes manifest.

Input

{"replicas":3,"image":"nginx:latest","port":80}

Output

replicas: 3
image: nginx:latest
port: 80

Convert a YAML GitHub Actions workflow to JSON

Extract YAML config data and convert it to JSON for programmatic processing.

Input

name: CI
on:
  push:
    branches: [main]

Output

{"name":"CI","on":{"push":{"branches":["main"]}}}

Common Use Cases

  • Converting JSON API responses to YAML for use in Kubernetes or Helm charts
  • Transforming YAML configuration files to JSON for programmatic processing
  • Converting Docker Compose YAML to JSON for validation or templating tools
  • Translating GitHub Actions workflow YAML for analysis or modification
  • Preparing YAML configuration files from JSON data sources
  • Converting OpenAPI / Swagger definitions between JSON and YAML formats

Troubleshooting

YAML output has unexpected indentation or line breaks

Solution

YAML indentation is significant. The converter uses 2-space indentation. Ensure you paste the complete YAML block and check that no extra spaces were added when copying.

Special YAML characters like : or # break the output

Solution

In YAML, colons after keys and hash signs in values must be handled carefully. The converter wraps such values in quotes automatically.

YAML to JSON conversion drops comments

Solution

JSON has no comment syntax, so YAML comments (#) cannot be represented in JSON and are dropped during conversion. This is expected behavior.

Frequently Asked Questions

Does it support all YAML features?

The tool handles standard YAML including nested objects, arrays, multiline strings (block scalars), and all scalar types. Anchors, aliases, and custom YAML tags may not be fully preserved.

Are YAML comments preserved when converting to JSON?

No. JSON has no comment syntax, so YAML comments are dropped during conversion. This is a fundamental limitation of the JSON format.

Can I convert a multi-document YAML file?

Multi-document YAML files (separated by ---) may not convert correctly as a single JSON output. Split documents individually and convert each one separately.

How does the tool handle YAML booleans and null?

YAML true/false become JSON true/false, and YAML null becomes JSON null. YAML yes/no and on/off are normalized to JSON boolean values.

Can I convert OpenAPI YAML to JSON?

Yes. OpenAPI definitions are valid YAML and JSON. Paste the YAML definition and select YAML → JSON to get the equivalent JSON OpenAPI spec.

Is indentation significant in YAML input?

Yes. YAML uses indentation to define nesting levels. Inconsistent indentation is a common source of YAML parse errors.

Is my data sent to a server?

No. All conversion is performed locally in your browser. Your YAML and JSON data never leaves your device.

What is the difference between JSON and YAML?

Both represent structured data, but YAML is optimized for human readability — it uses indentation instead of braces, allows comments, and has a less verbose syntax.