Paste YAML
Use a YAML document containing mappings, sequences, and supported scalar values.
JSON tools
YAML to JSON Converter
Convert YAML to JSON
JSON output
The result will appear here after you run the tool.
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About this tool
About this tool
YAML to JSON converts YAML configuration into strict formatted JSON by parsing YAML syntax and reporting errors before output generation. Processing happens locally in your browser, keeping source content private.
Paste YAML configuration or data and convert it to strict formatted JSON. Parser errors identify invalid YAML before output is generated.
Built for daily work
- Convert configuration files for JSON based applications.
- Inspect YAML as a JSON tree.
- Prepare data for APIs that require JSON.
- Create JSON fixtures from YAML examples.
How to use this tool
How to use this tool
Parse and convert
The parser resolves the YAML structure and serializes it into strict JSON.
Review data types
Check dates, numbers, booleans, nulls, and tagged values before using the output.
Key features
Key features
YAML syntax errors reported before conversion
Parser error messages identify the line where the YAML document breaks so you can fix indentation or structure before converting.
Configurable JSON indentation
Choose two-space, four-space, or tab output to match the style of the codebase or configuration system that will consume the JSON.
Type-aware scalar conversion
YAML dates, booleans, integers, floats, and nulls are mapped to their JSON equivalents. Check the output when your YAML uses typed tags or implicit boolean words.
Browser-side parsing via js-yaml
Conversion runs locally using the js-yaml library. Your YAML content is not transmitted to any server.
Practical use cases
Practical use cases
- Convert configuration files for JSON based applications.
- Inspect YAML as a JSON tree.
- Prepare data for APIs that require JSON.
- Create JSON fixtures from YAML examples.
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
InputOne YAML document
OutputStrict formatted JSON
Libraryjs-yaml in the browser
ProcessingLocal browser processing
Limitations and important notes
Limitations and important notes
- Comments and formatting are not preserved.
- Custom YAML tags may not convert to standard JSON values.
- Multiple YAML documents are not supported in one conversion.
- YAML anchors, aliases, and schema-specific scalar interpretation may not match every target runtime.
Frequently asked questions
Frequently asked questions
No. Comments are not part of the parsed data model and are lost during conversion to JSON.
Aliases are resolved into data values. The anchor relationship itself is not represented in JSON.
The current interface converts one YAML document at a time.
Yes. The YAML parser runs in the browser for this standard conversion.
No. JSON has no comment syntax, so comments are not present in the converted output.
Related guides and solutions
Related guides and solutions
YAML syntax reference for configuration and data files
A practical YAML reference that emphasizes indentation, ambiguous scalar values, safe parsing, and predictable conversion to JSON.
Learn moreJSON syntax and data type reference
A compact technical reference for writing and validating strict JSON that can be opened in standards-compliant parsers.
Learn moreWhat local browser processing means for online tools
A transparent explanation of local tool processing, temporary browser memory, local storage, downloads, analytics boundaries, and cases that require remote services.
Learn moreRelated tools
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