YAML to JSON Converter Online — Free
Runs 100% in your browser — your files never leave your device.
Config files live in YAML; APIs speak JSON. Paste your YAML and get clean, two-space-indented JSON out — merge keys are honored, and syntax errors are reported inline instead of silently dropping data. The conversion runs entirely in your browser, so configs with secrets are safe to paste.
How it works
- 1
Paste your YAML
The JSON output updates as you type.
- 2
Fix any syntax errors
Invalid YAML is flagged inline with the parser message.
- 3
Copy the JSON
One click copies the formatted result.
About this tool
How the conversion works
The tool parses your YAML with a real YAML engine — indentation structure, nesting, lists, and quoted values all resolved — then emits the equivalent JSON. The result is the same data in the format JavaScript and most APIs consume natively.
The type-inference difference
YAML infers types from unquoted values: yes becomes true, version numbers can become strings, and the infamous Norway problem turns no into false. The conversion carries whatever YAML decided — quote values that must stay strings, and verify the JSON types match your intent.
The config-pipeline use case
Kubernetes manifests, CI pipelines, and infrastructure tools speak YAML; application code and APIs speak JSON. Converting between them is the daily glue of DevOps work — parse errors name the offending line before the conversion attempts anything.
Frequently asked questions
Why did "no" become false in my JSON?
YAML 1.1 treated unquoted no/yes/on/off as booleans — a famous trap. Quote the value in your YAML and it converts as the string you meant.
Does it support anchors and multi-document files?
The parser covers core YAML including anchors; multi-document files process their first document. Split files on the --- separator for the rest.
Is my config uploaded anywhere?
No — parsing and conversion run entirely in your browser. Infrastructure secrets stay on your device.