Express validator example

express-validator-example.js

const { checkSchema } = require('express-validator/check');

exports.validateCalculate = [
  checkSchema({
    product: {
      in: ['query'],
      errorMessage: 'product must be an integer',
      exists: true,
      isInt: { options: { min: 0 } },
      toInt: true
    },
    unit_price: {
      in: ['query'],
      errorMessage: 'unit_price must be a positive float',
      exists: true,
      isFloat: { options: { min: 0 } },
      toFloat: true
    },
    total_cost: {
      in: ['query'],
      errorMessage: 'total_cost must be a positive float',
      exists: true,
      isFloat: { options: { min: 0 } },
      toFloat: true
    },
    dispatched_at: {
      in: ['query'],
      errorMessage: 'dispatched_at must be a date time',
      exists: true,
      custom: {
        options: value => {
          return !!value && !!Date.parse(value);
        }
      },
      toDate: true
    }
  })
];