What is a YAML to JSON Converter?
It converts YAML data into JSON for APIs, JavaScript applications, tests, scripts, developer tools, and configuration migrations.
Data Conversion
YAML to JSON guideYAML to JSON Converter
Convert YAML to JSON instantly. Paste YAML, validate it, format the JSON output, and copy or download the result.
Paste YAML or load a sample to begin.
YAML Input
Mappings, sequences, nested values, comments, multiline strings, anchors, aliases, and Unicode are supported.
JSON Output
Valid JSON for APIs, JavaScript apps, tests, scripts, migration, debugging, and automation.
Conversion details
YAML status, summary, and warnings
Convert YAML to see parse status, detected JSON type, input and output counts, formatting choices, and warnings.
YAML to JSON Guide
Turn readable YAML into strict JSON
Convert configuration, API examples, CI/CD data, test fixtures, and automation inputs locally without sending data to a conversion service.
How to convert YAML to JSON
Paste YAML, validate it, choose JSON formatting options, click Convert YAML to JSON, review the output, then copy or download the JSON file.
Common use cases
Convert YAML config, debug YAML files, prepare API data, translate OpenAPI examples, create mock JSON, and migrate configuration formats.
Supported YAML input
Mappings, sequences, nested objects and arrays, strings, numbers, booleans, nulls, comments, multiline strings, anchors, and aliases are supported.
YAML vs JSON
YAML is human-readable and common for configuration. JSON is stricter and widely used by APIs, JavaScript applications, tests, and automation.
Features that do not map perfectly
Comments, anchors, aliases, custom tags, duplicate keys, multiple documents, and non-string keys may be resolved, converted, rejected, or reported as warnings.
Privacy
Conversion happens locally in your browser. YAML input and JSON output are not uploaded, stored, or sent to an external service.
Tips and best practices
Validate YAML, use consistent indentation, avoid duplicate keys, protect secrets, review JSON before production use, and remember that comments are not preserved.
YAML to JSON FAQ
Is this YAML to JSON Converter free?
Yes, it is free to use on DevCoreTools.
Does this tool upload my YAML?
No. YAML to JSON conversion runs locally in your browser.
Does this tool validate YAML before converting?
Yes. Invalid YAML shows a friendly validation message before conversion.
Can I download the JSON file?
Yes. Use Download JSON to save the exact displayed output as a .json file.
Does YAML to JSON preserve comments?
No. JSON does not support comments, so YAML comments are not preserved.
Can YAML anchors and aliases be converted to JSON?
Basic anchors and aliases are resolved by the parser, with warnings because JSON has no native anchor or alias syntax.
What happens with multiple YAML documents?
They are rejected by default. Enable the multiple-document array option to convert them into one JSON array.
What JSON output format is supported?
The tool supports pretty JSON and minified JSON with 2- or 4-space indentation for pretty output.
Is YAML the same as JSON?
No. YAML is a readable serialization format often used for configuration. JSON is a stricter format commonly used by APIs and JavaScript.
What is the difference between YAML to JSON and JSON to YAML?
YAML to JSON parses YAML and outputs JSON. JSON to YAML converts valid JSON into YAML.
Is this the same as JSON Formatter?
No. JSON Formatter makes existing JSON easier to read. YAML to JSON converts YAML into new JSON output.