Type Packages

Get the native type of a value.

Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.

Check if a path is a file, directory, or symlink

Media Type Database

Returns true if the value is an object and not an array or null.

Detect the file type of a Buffer/Uint8Array/ArrayBuffer

Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.

Returns true if a value has the characteristics of a valid JavaScript data descriptor.

Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.

Check if something is a Node.js stream

Returns true if any values exist, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays.

Returns true if a value exists, false if empty. Works with deeply nested values using object paths.

Determines if an object can be used as an array

Determine if an object is a Buffer

Returns true if an object was created by the `Object` constructor, or Object.create(null).

type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

Determine if an object is a Stream

Check if a value is an object

Check if a value is a plain object

Runtime validation and processing of JavaScript types