Arrays

array

function array( decoder: Decoder<T> ): Decoder<T[]> (source)

Accepts arrays of whatever the given decoder accepts.

Try it

array(string).verify(input)

function nonEmptyArray( decoder: Decoder<T> ): Decoder<[T, ...T[]]> (source)

Like array(), but will reject arrays with 0 elements.
Equivalent to sized(array(decoder), { min: 1 }).

Try it

nonEmptyArray(string).verify(input)

poja: Decoder<unknown[]> (source)

Accepts any array, but doesn't validate its items further.

"poja" means "plain old JavaScript array", a play on pojo.

Try it

poja.verify(input)

function tuple( Decoder<A>, Decoder<B>, ... ): Decoder<[A, B, ...]> (source)

Accepts a tuple (an array with exactly n items) of values accepted by the n given decoders.

Try it

tuple(string, number).verify(input)

function sized( decoder: Decoder<T[]>, options: SizeOptions ): Decoder<T[]> (source)

Available since 2.9.

Takes any array decoder and rejects values that don't match the given size constraints. Also works with strings and sets.

SizeOptions accepts min, max, or size (shorthand for exact length).

Try it

sized(array(number), { min: 2, max: 4 }).verify(input)