YAML Tools
YAML Type Coercion Checker
Find values that coerce to different types in YAML 1.1 vs 1.2.
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What is Coercion Check?
A safety scanner for the YAML 'Norway problem': tokens like yes, no, on, off, and leading-zero numbers parse differently under YAML 1.1 vs 1.2 schemas.
How it works
Each candidate token is probed with js-yaml under both CORE (1.2) and YAML 1.1 schemas; differing results are flagged with a fix suggestion.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Paste or type any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.
Frequently asked questions
Why does quoting fix it?
Quoted scalars are always strings in every schema — wrapping the token in quotes makes its type unambiguous regardless of parser version.