A Go library for validating structs and fields.

1. Simple

   Simple and stupid, no magic involved.

2. Type-safe

   Schema is defined in Go, which is type-safer (and more powerful) than traditional struct tags.

3. Flexible

   • Validators are composite.
   • Nested struct validation is well supported.
   • Schema can be defined inside or outside struct.
   • Validator customizations are made easy.

4. No reflection

$ go get github.com/RussellLuo/validating

To be strict, this library has a conceptual distinction between validator factory and validator.

A validator factory is a function to create a validator, which will do the actual validation.

• FromFunc
• All/And
• Any/Or
• Not
• Nested
• NestedMulti
• Lazy
• Assert
• Nonzero
• Len
• Gt
• Gte
• Lt
• Lte
• Range
• In

• From a boolean expression
• From a function
• From a struct

• Single field
• Flag field
• Simple struct
• Nested struct
• Nested struct (schema inside)
• Nested struct pointer
• Nested struct slice
• Nested struct map

Check out the Godoc.

This library borrows some ideas from the following libraries:

• mholt/binding

  Prefer no reflection.

• alecthomas/voluptuous

  Support composite-style validator factories All/And, Any/Or.

• go-validator/validator

  Use the term nonzero instead of required/optional.

MIT