# LibTmux::FilterExpr.json_schema

- **Module:** LibTmux::FilterExpr
- **Package:** libtmux
- **Language:** Ruby
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ruby/blob/c6d9d21771828e583692ca899ed817f9640d6a55/gems/libtmux/lib/libtmux/criteria.rb#L11
- **Page:** https://libtmux.org/en/ruby/latest/reference/libtmux-filterexpr-json_schema/

```
LibTmux::FilterExpr.json_schema() -> ::Hash[::String, untyped]
```

Runtime validation also enforces byte, node, depth and duplicate-key limits.

Behavior contract: Criteria.