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validator
:100:Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving
github.com/go-playground/validator/ has a bug with nested struct which breaks. Also somewhat limited Ruleset it seems.
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CodeRabbit
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ozzo-validation
An idiomatic Go (golang) validation package. Supports configurable and extensible validation rules (validators) using normal language constructs instead of error-prone struct tags.
https://github.com/go-ozzo/ozzo-validation Seems to do what I need but likely will need some convoluted reflection to build out the rules. Also likely some custom rules to be written which is okay since it's a one time cost and reuse in the expressions.
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expr
Discontinued Expression language and expression evaluation for Go [Moved to: https://github.com/expr-lang/expr] (by antonmedv)
https://github.com/antonmedv/expr/ Seems really promising though having a rough time finding examples or basic do something as simple as struct.Value == N though I did find some examples on iterating and such.
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https://github.com/google/cel-go Didn't find much support for structs.
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Otto https://github.com/robertkrimen/otto Seems interesting. It lets me call Go functions from inside JS as well as return results. The fncs pattern reminds me a bit of how the template engine works.
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Nutrient
Nutrient – The #1 PDF SDK Library, trusted by 10K+ developers. Other PDF SDKs promise a lot - then break. Laggy scrolling, poor mobile UX, tons of bugs, and lack of support cost you endless frustrations. Nutrient’s SDK handles billion-page workloads - so you don’t have to debug PDFs. Used by ~1 billion end users in more than 150 different countries.