see https://github.com/skaterdav85/validatorjs

npm i git://github.com/potentia-inc/validator.git#v1.2.x

const validator = require('validator')
const S = require('sanctuary')

const rule = { foo: 'required|string|between:3,10' }

validator (rule) ({ foo: 'abc' })  // => Right ({ foo: 'abc' })
validator (rule) ({ foo: 'a' })  // => Left ('...failure message.')

const v = validator(rule)(obj)
if (S.isLeft(v)) { console.error(v.value) /* validation failed */ }
if (S.isRight(v)) { console.log('passed!', v.value) /* validation passed */ }

// validator :: Rule -> Object -> S.Either String Object

• Rule is an alias type for ordinary object.
• Object is the type for input object.
• When the validation is passed, the output will be a Either Right with value the same as input object.
• When the validation is failed, the output will be a Either Left with value a string with informative failure reason.

• Bitcoin: rule = { address: `required|string|bitcoinAddress:${network}` } // network: 'mainnet' | 'testnet'
• Etherem: rule = { address: `required|string|ethereumAddress:${check}` } // check: 'checked' | 'unchecked'
• Ripple: rule = { address: `required|string|rippleAddress` }

• Ripple Tag: rule = { tag: 'string|rippleTag' }
• EOS Memo: rule = { tag: 'string|eosMemo' }

• Decimal Place: rule = { amount: 'required|string|numeric|decimal:5' }

  • { amount: '0.0001' } // passed
  • { amount: '0.00001' } // passed
  • { amount: '0.000010000' } // passed
  • { amount: '0.000001' } // failed

• Positivity: rule = { amount: 'required|string|numeric|positive' }

  • { amount: '0.0001' } // passed
  • { amount: '+0.0001' } // passed
  • { amount: '-0.00001' } // failed

• Printable: rule = { client_id: 'required|string|isprint' }

  • { client_id: 'alice' } // passed
  • { client_id: '_bob' } // passed
  • { client_id: '!carol ' } // passed
  • { client_id: "dave\x01" } // failed

It is recommended to add a string requirement to all rules when validating addresses, tags, amounts.

• https://support.exodus.io/article/828-what-are-destination-tags-and-how-do-i-use-them
• https://github.com/skaterdav85/validatorjs