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You can configure validations the content type editor. To add a validation to a field, navigate to the validations dialog, check the rules you want to invoke and provide the missing values. Validations only take effect after the content type has been activated (or saved for already active content types), thus previously published entries will not be validated until they are published again.
Contentful validations module automatically checks set validations and alerts a user if the specified constraints are impossible to satisfy, for example, because the user has provided incompatible date ranges, entered invalid data or failed to enter a required value.
All validations come with default error messages, but you can also display custom error messages to editors working in Contentful by entering them into an appropriate field under the validation rule.