Decode

bool

RESCRIPT

let bool: t => option<bool>

Decodes a single JSON value. If the value is a bool, it will return Some(bool) - otherwise it will return None.

RESCRIPT
JSON.parseExn(`true`)->JSON.Decode.bool
// Some(true)

JSON.parseExn(`"hello world"`)->JSON.Decode.bool
// None

RESCRIPT

let null: t => option<Core__Null.t<'a>>

Decodes a single JSON value. If the value is null, it will return Some(Null.t) - otherwise it will return None.

RESCRIPT
JSON.parseExn(`null`)->JSON.Decode.null
// Some(null)

JSON.parseExn(`"hello world"`)->JSON.Decode.null
// None

RESCRIPT

let string: t => option<string>

Decodes a single JSON value. If the value is a string, it will return Some(string) - otherwise it will return None.

RESCRIPT
JSON.parseExn(`"hello world"`)->JSON.Decode.string
// Some("hello world")

JSON.parseExn(`42`)->JSON.Decode.string
// None

RESCRIPT

let float: t => option<float>

Decodes a single JSON value. If the value is a float, it will return Some(float) - otherwise it will return None.

RESCRIPT
JSON.parseExn(`42.0`)->JSON.Decode.float
// Some(42.0)

JSON.parseExn(`"hello world"`)->JSON.Decode.float
// None

RESCRIPT

let object: t => option<Core__Dict.t<t>>

Decodes a single JSON value. If the value is an object, it will return Some(Dict.t) - otherwise it will return None.

RESCRIPT
JSON.parseExn(`{"foo":"bar"}`)->JSON.Decode.object
// Some({ foo: 'bar' })

JSON.parseExn(`"hello world"`)->JSON.Decode.object
// None

RESCRIPT

let array: t => option<array<t>>

Decodes a single JSON value. If the value is an array, it will return Some(array) - otherwise it will return None.

RESCRIPT
JSON.parseExn(`["foo", "bar"]`)->JSON.Decode.array
// Some([ 'foo', 'bar' ])

JSON.parseExn(`"hello world"`)->JSON.Decode.array
// None