YAML to JSON Converter
YAML is beautiful to write but many apps, APIs and databases only accept JSON. This free YAML to JSON converter parses your YAML — mappings, lists, nested objects, quotes and multi-line blocks — and emits clean, indented JSON you can copy straight away. Everything runs privately in your browser.
What is YAML and why convert it to JSON?
YAML (YAML Ain't Markup Language) is a data-serialization format designed to be easy for humans to read and write. Instead of the brackets and braces and commas of JSON, YAML uses indentation to show nesting, colons to separate keys from values, and dashes for list items. That is why it has become the default for configuration files in Kubernetes, Docker Compose, GitHub Actions, CI pipelines and countless other tools.
JSON is the language of the web — JavaScript Object Notation — and is what most APIs, browsers, databases and front-end frameworks expect. When you want to reuse a YAML config in a JSON-only context, or when a teammate prefers JSON, you need a way to switch formats without retyping everything by hand. A converter parses the YAML into an object and then serializes that object as formatted JSON, preserving the exact same data.
This tool runs entirely in your browser, so sensitive config never leaves your device.
How to use the YAML to JSON converter
- Paste your YAML into the input area.
- Click Convert to JSON.
- Read the formatted result in the output area.
- Click Copy to use it, or Clear to start over.
Example
YAML input:
name: ToolCubby tags: - seo - tools active: true
Converted JSON:
{
"name": "ToolCubby",
"tags": [
"seo",
"tools"
],
"active": true
}The status confirms conversion succeeded.
Common use cases
- Reusing a Docker Compose or GitHub Actions config inside a JSON-driven tool.
- Turning a hand-written YAML config into data an API can consume.
- Reading a Kubernetes manifest as readable JSON for debugging.
- Sharing configuration with a teammate or service that only accepts JSON.
Pro tips
- YAML blocks and sequences use indentation as structure — keep tabs and spaces consistent or parsing fails.
- Booleans and null are written
true/false/null; numbers can be plain or decimal. - Quote values that contain a colon or start with a special character to keep them as strings.
- Use
|for multiline text that should keep its line breaks, and>for text that folds into one line.
FAQ
What is YAML?
YAML (YAML Ain't Markup Language) is a human-readable data-serialization format that uses indentation instead of brackets, commonly used for config files.
Why convert YAML to JSON?
Many systems, APIs and databases consume JSON, while humans and dev tooling often write YAML. Converting lets you share the same data across both.
Is the conversion accurate?
Yes, the tool parses standard YAML (mappings, sequences, scalars, quotes, block scalars) and emits equivalent JSON with the same nesting.
Does it upload my YAML anywhere?
No. Parsing runs entirely in your browser, so your data never leaves your device.
Can it convert back from JSON to YAML?
This tool converts YAML to JSON only, but it pairs with the JSON formatter and other format tools on ToolCubby.
What YAML features are supported?
Block mappings and sequences, nesting by indentation, comments, quoted and plain scalars, numbers, booleans, null, and folded or literal block scalars.
Why is my JSON invalid?
If the YAML itself has a syntax problem such as inconsistent indentation or a missing colon, the converter reports the error instead of producing broken JSON.
Is it free to use?
Yes, free and unlimited with no signup required.
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