form.date-parts
Check a date typed into day, month and year boxes, with GOV.UK's error messages and the boxes to mark in error.
validate_date_parts in PythonTagged form
22 capabilities
auth.validate-login
Check a login form (email, password): the normalised email to look up, or a message for each field to fix.
validate_login in Python
auth.validate-password-change
Check a change-password form: current password given and correct, new one meeting the policy and different.
validate_password_change in Python
auth.validate-registration
Validate a sign-up form (email, password, name) in one call, with a message per field, in the browser and the API alike.
validate_registration in Python
form.character-count
The GOV.UK character count message for a text box: characters or words left or over a limit, with a threshold.
character_count in Python
react.form.button React ^19 · TypeScript only
A form button in primary, secondary or warning style that stays focusable while loading (GOV.UK button).
Not available in Python
react.form.date-input React ^19 · TypeScript only
Day, month and year boxes under one legend, with hint, error message and the boxes in error marked (GOV.UK date input).
Not available in Python
react.form.error-summary React ^19 · TypeScript only
A "There is a problem" box linking to each field in error, focused on arrival, built from a validator's fields (GOV.UK).
Not available in Python
react.form.fieldset React ^19 · TypeScript only
Group related inputs under a legend, with a hint and error message described to the whole group (GOV.UK fieldset).
Not available in Python
react.form.form-field React ^19 · TypeScript only
Wire a label, hint and error message to one form control by id, the accessible way (GOV.UK form group pattern).
Not available in Python
react.form.password-field React ^19 · TypeScript only
A password input with a Show/Hide button and an optional live checklist of a password policy (GOV.UK password input).
Not available in Python
react.form.radio-group React ^19 · TypeScript only
Choose exactly one of several radios, with item hints, an "or" divider and inline yes/no (GOV.UK radios).
Not available in Python
react.form.select React ^19 · TypeScript only
A labelled drop-down list with a hint, error message and an optional empty first option (GOV.UK select).
Not available in Python
react.form.styles React ^19 · TypeScript only
An optional stylesheet for the react.form elements' caps-* classes, themed by --caps-form-* custom properties.
Not available in Python
react.form.text-field React ^19 · TypeScript only
A labelled single-line text input with hint, error message, autocomplete, prefix and suffix (GOV.UK text input).
Not available in Python
react.form.textarea React ^19 · TypeScript only
A labelled multi-line text box with hint, error and an optional live character or word count (GOV.UK).
Not available in Python
todo.item
The to-do item type (Todo, TodoDraft, Recurrence) and its validators, with a message per field.
A group of 2:
validate_draft, validate_todo
todo.parse-repeat
Read a Repeat box, "every 2 weeks" or "every monday on 2026-10-05", as a todo's recurrence, or null.
parse_repeat in Python
react.form.checkbox-group React ^19 · TypeScript only
A question answered by ticking any of several checkboxes, with item hints and an exclusive "None" (GOV.UK checkboxes).
Not available in Python
todo.parse-tags
Read a tags box as typed, "#Home, work errands", into normalised tags: split on spaces and commas.
parse_tags in Python
form.state TypeScript only
A form's state as a pure reducer: values, touched fields, validator errors and the submit, for useReducer.
Not available in Python
react.form.checkbox React ^19 · TypeScript only
One checkbox with its label beside it, such as "I agree to the terms" (GOV.UK single checkbox).
Not available in Python