JS Tools

Convert JSON to YAML Online

Convert JSON to YAML.

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How to use

  1. Paste or type your input in the left editor
  2. Adjust options in the toolbar if available
  3. Copy or download the output from the right pane

This free online tool runs entirely in your browser. No sign‑up, no server uploads.

About JSON to YAML Converter

Convert JSON to YAML.

The JSON to YAML converter first parses your JSON input into a native JavaScript object, validating the syntax in the process. It then walks the object recursively, emitting YAML syntax: keys are followed by colons, nested objects are indented, and arrays use the dash-list notation. Strings that might be misinterpreted by YAML parsers (such as values resembling dates, booleans, or numbers) are automatically wrapped in quotes to ensure round-trip fidelity.

Use the left editor to enter your data. The output updates in real time. You can copy, clear, download, or expand either pane.

Tip: Use the search bar to quickly switch between tools.

Sample YAML

name: Jane
age: 29
skills:
  - js
  - html
  - css
Example input shown above. Output appears in the right pane instantly.

Why this tool?

FeatureJSON to YAML ConverterTypical alternatives
Free online toolYesOften yes
Client‑side only (privacy)YesVaries
No sign‑up requiredYesVaries

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FAQs

How does the converter handle nested JSON objects in YAML output?
Nested JSON objects are converted to indented YAML mappings using consistent 2-space indentation. Each nesting level adds another indent, and arrays are rendered with YAML's dash-prefix syntax, producing clean and readable YAML output.
Does the converter preserve JSON data types in YAML?
Yes. Strings, numbers, booleans, null values, arrays, and nested objects are all mapped to their YAML equivalents. Strings that could be ambiguous in YAML (like 'true', 'yes', or numeric-looking values) are automatically quoted to prevent type coercion.
Can I convert JSON with special characters to YAML?
The converter handles special characters including colons, hash symbols, and leading/trailing spaces by properly quoting string values in the YAML output. This ensures the YAML can be parsed back without data loss.
What is the maximum JSON size I can convert to YAML?
The conversion runs entirely in your browser, so there is no server-imposed size limit. JSON documents up to several megabytes convert in seconds. For extremely large files, performance depends on your device's available memory.
Can I convert JSON to YAML for Kubernetes or Docker Compose configs?
Yes. This is one of the most common use cases. If you have a Kubernetes manifest or Docker Compose configuration in JSON, the converter produces properly formatted YAML that is directly usable with kubectl apply or docker-compose up.
Does the YAML output include document markers?
The converter produces clean YAML without the optional document start marker (---) by default, giving you minimal output. You can add the marker manually if your workflow requires multi-document YAML streams.