Undefined Packages

Return the first argument that is "!= undefined" (or "!= null", which is the same thing)

ntnl [not null]: a tiny js library which sanitizes null / undefined values from objects by replacing them with provided values

Validates if a value is an array of JavaScript primitives.

Check if the required properties are set, the easy way!

Remove undefined variables from a GraphQL query

A lightweight package that makes dealing with Cannot read property of undefined errors easy in a way that your IDE can understand. No strings used.

LightWeight, dependency free, javascript object cleaning library

Inspect a value, return typeOf ++

default value `typeof value === 'undefined'? 'defaultValue': value` syntactic sugar

Tests a value’s type against a string like 'positive integer' or 'non-empty map'.

undefined is not a function and it's likely to remain so forever

Aims to solve the problem of this error. When there is a complex object such us:

Tools for testing against null and undefined values.

Access and chain object properties and methods in a safe manner.

TypeScript transformer to make transpiled output of optional chaining and nullish coalescing less verbose

Undefined object class wrapper.

Nullish checker

Escape the dreaded Uncaught TypeError: Cannot read property 'a' of undefined

Return a value when a condition passes, otherwise return undefined

This is a wrapper of JSON stringify that converts also undefined and null to string.