ow - Function argument validation for humans

•    TypeScript

---

Test if value matches the provided predicate. Create a reusable validator.

validation type-checking nodejs npm-package type types check checking guard guards assert assertion predicate predicates is validate utility util typeof instanceof object

file-type - Detect the file type of a Buffer/Uint8Array

•    Javascript

---

The file type is detected by checking the magic number of the buffer.Show your support for this module by buying this excellent Node.js course.

nodejs uint8array buffer magic-numbers file magic file-types detect mime type archive image img pic picture flash photo video check is exif exe binary jpg png gif webp flif cr2 tif bmp jxr psd zip tar rar gz bz2 7z dmg mp4 m4v mid mkv webm mov avi mpg mp3 m4a ogg opus flac wav amr pdf epub mobi swf rtf woff woff2 eot ttf otf ico flv ps xz sqlite xpi cab deb ar rpm z lz msi mxf mts wasm webassembly blend bpg docx pptx xlsx 3gp jp2 jpm jpx mj2 aif odt ods odp xml

generate-schema - Convert JSON Objects to MySQL Schema, JSON Schema, Mongoose Schema, Google BigQuery, or a Generic template for Swagger files, documentation, code generation, and more

•    Javascript

---

Convert JSON Objects to MySQL Table Schema, JSON Schema, Mongoose Schema, ClickHouse Schema, Google BigQuery, or a Generic template for documentation, code generation, and more. Optionally, add -g to the above if you want the generate-schema command line executable.

json schema object convert manipulate traverse types type is generate produce mongoose generic validation bigquery google data datatypes

is-online - Check if the internet connection is up

•    Javascript

---

Works in Node.js and the browser (with browserify/webpack).In the browser you have navigator.onLine, but it's useless as it only tells you if there's a local connection, and not whether the internet is accessible.

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is - Type check values: `is.string('🦄') //=> true`

•    TypeScript

---

Returns the type of value.Primitives are lowercase and object types are camelcase.

type types is check checking validate validation utility util typeof instanceof object assert assertion test kind primitive verify compare

t2b - A wicked-powerful text macro language for building binary files.

•    C++

---

A wicked-powerful text macro language for building binary files. Supports comments, looping, Unicode, variables, conditionals, macros and recursion. TLDR; Check out example/.

programming-language command-line macros wtf is up kyle

valid-filename - Check if a string is a valid filename

•    Javascript

---

Check if a string is a valid filename

re regex regexp filename valid validate check detect is str string

path-is-absolute - Node.js 0.12 path.isAbsolute() ponyfill

•    Javascript

---

See the path.isAbsolute() docs.POSIX specific version.

path paths file dir absolute isabsolute is-absolute built-in util utils core ponyfill polyfill shim is detect check

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

•    Javascript

---

Returns a Promise for a boolean of whether the path is the checked type.Returns a boolean of whether the path is the checked type.

path fs type is check directory dir file filepath symlink symbolic link stat stats filesystem

positive-zero - Check if a number is positive zero

•    Javascript

---

Check if a number is positive zero

number is check detect positive zero

is-touch-device - Is the current JS environment a touch device?

•    Javascript

---

Is the current JS environment a touch device?

touch is documenttouch maxtouchpoints msmaxtouchpoints touchpoints ontouchstart

is-typedarray - Detect whether or not an object is a Typed Array

•    Javascript

---

Detect whether or not an object is a Typed Array.Returns true when array is a Typed Array, and false when it is not.

typed array detect is util

is-type - Type checking from node core.

•    Javascript

---

Type checking from node core.This basically is core-util-is but with a nicer api.

type checking is util types

file-type-cli - Detect the file type of a file or stdin

•    Javascript

---

Detect the file type of a file or stdin

cli-app cli mime file type archive image img pic picture flash photo video detect check is exif exe binary buffer uint8array

negative-zero - Check if a number is negative zero

•    Javascript

---

Check if a number is negative zero

number is check detect negative zero

number-is-nan - ES2015 Number.isNaN() ponyfill

•    Javascript

---

ES2015 Number.isNaN() ponyfill

es2015 ecmascript ponyfill polyfill shim number is nan not

p-is-promise - Check if something is a promise

•    Javascript

---

Why not is-promise? That module checks for a thenable, not an ES2015 promise. This one is stricter.You most likely don't need this. Just pass your value to Promise.resolve() and let it handle it.

promise is detect check kind type thenable es2015 async await promises bluebird

is-obj - Check if a value is an object

•    Javascript

---

Keep in mind that array, function, regexp, etc, are objects in JavaScript. See is-plain-obj if you want to check for plain objects.

obj object is check test type

is-observable - Check if a value is an Observable

•    Javascript

---

Check if a value is an Observable

observable observables is check detect type

is-online-cli - Check if the internet connection is up

•    Javascript

---

Check if the internet connection is up

nodejs cli cli-app connectivity detect internet internet-connection network online ping reachability browser offline is-online connected is has hostname hostnames dns socket reachable accessible