I know that Vex is a great and popular data validation library. But learn how to write a library is fun and I can learn lots of things. So I build my own library called Valdi

https://github.com/bluzky/valdi

• It supports validate value against multiple validation:

iex(12)> Valdi.validate(10, type: :integer, number: [min: 10, max: 20])
:ok
iex(13)> Valdi.validate("email@g.c", type: :string, format: ~r/.+@.+\.[a-z]{2,10}/)
{:error, "format not matched"}

• You can validate list of value

iex(51)> Valdi.validate_list([1,2,3], type: :integer, number: [min: 2])
{:error, [[0, "must be greater than or equal to 2"]]}

• And validate map data too

iex(54)>  validation_spec = %{
...(54)>     email: [type: :string],
...(54)>     password: [type: :string, length: [min: 8]],
...(54)>     age: [type: :integer, number: [min: 16, max: 60]]
...(54)>   }
iex(56)> Valdi.validate_map(%{name: "dzung", password: "123456", emal: "ddd@example.com", age: 28}, validation_spec)
{:error, %{password: "length must be greater than or equal to 8"}}

Thank for reading.
Please comment if you have any suggestion.