Typed JSON
This library is a set of type definitions and utilities for dealing with JSON data in a type-safe way with TypeScript.
The most important type definitions are JSON.Value, JSON.Object,
and JSON.Array, which correspond respectively to JSON values,
objects, and arrays, as the names suggest.
The library also exports safely-typed versions of the standard JSON.parse() and JSON.stringify() functions.
Basic Usage
;Types
interface JSON.Object
interface JSON.Array
type JSON.Value
;Type Testing API
function JSON.isNull(x: JSON.Value): x is null
Tests if a JSON value is null.
function JSON.isBoolean(x: JSON.Value): x is boolean
Tests if a JSON value is a boolean.
function JSON.isNumber(x: JSON.Value): x is number
Tests if a JSON value is a number.
function JSON.isString(x: JSON.Value): x is string
Tests if a JSON value is a string.
function JSON.isObject(x: JSON.Value): x is JSON.Object
Tests if a JSON value is a JSON object.
function JSON.isArray(x: JSON.Value): x is JSON.Array
Tests if a JSON value is a JSON array.
Type Cast API
function JSON.asNull(x: JSON.Value, prefix?: string): null
Casts a JSON value to null, throwing a TypeError if it fails.
The optional prefix argument allows callers to provide a contextual
string describing the value that is being tested, for the sake of
generating useful error messages in the case of a type error.
function JSON.asBoolean(x: JSON.Value, prefix?: string): boolean
Casts a JSON value to a boolean, throwing a TypeError if it fails.
The optional prefix argument allows callers to provide a contextual
string describing the value that is being tested, for the sake of
generating useful error messages in the case of a type error.
function JSON.asNumber(x: JSON.Value, prefix?: string): number
Casts a JSON value to a number, throwing a TypeError if it fails.
The optional prefix argument allows callers to provide a contextual
string describing the value that is being tested, for the sake of
generating useful error messages in the case of a type error.
function JSON.asString(x: JSON.Value, prefix?: string): string
Casts a JSON value to a string, throwing a TypeError if it fails.
The optional prefix argument allows callers to provide a contextual
string describing the value that is being tested, for the sake of
generating useful error messages in the case of a type error.
function JSON.asObject(x: JSON.Value, prefix?: string): JSON.Object
Casts a JSON value to a JSON object, throwing a TypeError if it fails.
The optional prefix argument allows callers to provide a contextual
string describing the value that is being tested, for the sake of
generating useful error messages in the case of a type error.
function JSON.asArray(x: JSON.Value, prefix?: string): JSON.Array
Casts a JSON value to a JSON array, throwing a TypeError if it fails.
The optional prefix argument allows callers to provide a contextual
string describing the value that is being tested, for the sake of
generating useful error messages in the case of a type error.
Serialization and Deserialization API
function parse(source: string): JSON.Value
Parses a source string as a JSON value.
function stringify(value: JSON.Value): string
Serializes a JSON value to a string.
function loadSync(path: string, encoding: BufferEncoding = 'utf8'): JSON.Value
Synchronously loads a JSON value from the filesystem.
function load(path: string, encoding: BufferEncoding = 'utf8'): Promise<JSON.Value>
Asynchronously loads a JSON value from the filesystem.