Longitude

Validates that a value is a longitude coordinate in decimal degrees, in the range -180 to 180.

Configuration

Config flag	Type	Description
`longitude`	`boolean`	When `true`, requires the value to be a valid longitude.

const form = useForm({
  initialValues: { lng: '' },
  validationSchema: {
    lng: { longitude: true },
  },
});

import { V } from 'formify-js';

V.longitude();

Scenario	Message
Value is not a valid longitude	`Must be a valid longitude`

Value	Result
`'-0.1278'`	✅ Valid
`'139.6917'`	✅ Valid
`'180'`	✅ Valid (antimeridian)
`'-181'`	❌ Invalid (out of range)
`'12.3E'`	❌ Invalid (direction suffix not accepted)

Values outside -180 … 180 fail.
Direction suffixes (E/W) and degree symbols are not accepted — use plain decimal degrees.
Combine with latitude to validate coordinate pairs on separate fields.