YAML to JSON Converter — Online Free Tool

Convert YAML configuration files to valid JSON instantly. Handles multi-line strings, anchors, aliases, and nested mappings. Output is formatted and ready to use.

Key Features

Full support for YAML anchors (&), aliases (*), and merge keys (<<)
Accurate type preservation for integers, floats, booleans, and nulls
Formats output with customizable indentation or compact JSON
Detects YAML indentation mismatches and provides line-level errors

How to Use

Paste your YAML document into the left-hand input box.
Select your desired JSON indentation spacing (2 or 4 spaces).
Click "Convert to JSON" to parse and translate the document.
Inspect the converted JSON in the output panel.
Copy the resulting JSON or save it to a file.

Example

Sample input

server:
  host: localhost
  port: 8080
features:
  - auth
  - metrics

Sample output

{"server":{"host":"localhost","port":8080},"features":["auth","metrics"]}

Edge Cases

Anchors and aliases
Multi-line folded strings
Tabs used for indentation (often invalid)

Frequently Asked Questions

Can this tool handle YAML anchors and aliases?

Yes. YAML anchors and aliases are fully resolved during conversion and expanded into their corresponding JSON representations.

What happens to comments in YAML files?

Because standard JSON does not support comments, YAML comments are stripped during conversion to ensure the resulting JSON is strictly compliant.

Can this convert multi-document YAML files?

Multi-document YAML files separated by "---" can be parsed into an array of distinct JSON objects.

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Privacy notice: when you run this tool, your input is sent over HTTPS to our server, processed in memory and returned. It is not stored or logged. Avoid pasting live secrets such as private keys or passwords.