@vdegenne/server-helpers

checkFields

import {
	checkFields,
	FieldCheckStrategy,
} from '@vdegenne/server-helpers/checkFields.js';

const allFields: (keyof Person)[] = ['name', 'age', 'city']; // e.g. a person

router.post('/api/person', (ctx) => {
	const fields = checkFields<Person>(
		ctx,
		allFields,
		FieldCheckStrategy.ALL_REQUIRED,
	);
	// If the check fails it auto stops (400)

	// do something with `fields` (filtered body)
});

router.put('/api/person/:personId', (ctx) => {
	const fields = checkFields<Person>(
		ctx,
		allFields,
		FieldCheckStrategy.AT_LEAST_ONE,
	);
	// If the check fails it auto stops (400)

	// do something with `fields` (filtered body)
});

Note: Do not wrap the call in a try block, it automatically stops execution and sends a 400 response for you (unless you want to redefine the error message)