formalist-validation

Data validation library for Formalist based on predicate logic.

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Formalist Validation
Data validation library for Formalist based on predicate logic.
The scope of the library is very simple. It tests a value against a given schema and returns an array of relevant error messages.

Usage

import validation from 'formalist-validation'

// Define a schema
const schema = {
  "filled": true,
  "min_size": 2,
  "max_size": 3,
}

// Curry validator with the schema
const validator = validation(schema)

// Test
validator([1])
// => ['size cannot be less than 2']
validator([1,2])
// => []
validator([1,2,3])
// => []
validator([1,2,3,4])
// => ['size cannot be greater than 3']

View the full list of available predicates to see what else you can test.

Caveats

  • Tests will only be run if there’s a value to test or the schema specifies that to test that the value is 'filled'.
  • All the predicate tests are run as logical ANDs. There’s no support for more complex logic at at the moment.

TODO

  • Allow custom validations to be injected
  • i18n support