YAML to JSON Converter
Convert YAML to JSON in your browser — handles mappings, sequences, nesting and common scalars. Friendly errors, copy or download.
About the YAML to JSON Converter
This YAML to JSON converter parses YAML with a built-in parser and produces clean, formatted JSON. It handles the everyday YAML you actually write: nested mappings, block and flow sequences, quoted and plain scalars, numbers, booleans, nulls and comments — turning config files into JSON your tools can consume.
It's ideal for feeding YAML configs — Kubernetes manifests, CI pipelines, Docker Compose, app settings — into systems and scripts that expect JSON, or just to double-check how a YAML file is actually being interpreted.
Parsing runs entirely in your browser, so your configuration never leaves your machine, and syntax problems are reported with the line number so you can fix them fast.
How to Use the YAML to JSON Converter
- 1Paste your YAML into the input box.
- 2Click Convert to parse it into JSON.
- 3Review the formatted JSON output.
- 4Copy the JSON or download it as a file.
Frequently Asked Questions
Which YAML features are supported?
The common ones: nested block mappings and sequences, flow style ([1, 2] and {a: 1}), single- and double-quoted strings, plain scalars, integers, floats, booleans, nulls and comments. Advanced features like anchors and aliases (&, *), custom tags and multi-document files are not supported.
Why do I get an indentation error?
YAML is whitespace-sensitive and forbids tabs for indentation — use spaces, consistently. The parser reports the line where indentation doesn't line up with the surrounding structure. Fixing the spaces on that line usually resolves it.
How are YAML data types converted?
Plain scalars are interpreted: 123 becomes a number, true/false become booleans, null or ~ become null, and everything else stays a string. Quote a value ("123") to force it to be a string in the JSON output.
Can I convert JSON back to YAML?
Yes — use the JSON to YAML Converter for the reverse. Since JSON is a subset of YAML, a YAML→JSON→YAML round trip preserves your data, though comments are dropped because they aren't part of the data model.
Is my YAML uploaded?
No. Parsing runs entirely in your browser, so nothing is sent to a server. It's safe for configuration files containing secrets or internal details.