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sindresorhus/is-port-reachableJavaScript

Check if a local or remote port is reachable

Last commit Aug 31, 2023

 (113 stars) (13 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-progressiveJavaScript

Check if JPEG images are progressive

Last commit Jul 6, 2024

 (199 stars) (6 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-progressive-cliJavaScript

Check if JPEG images are progressive

Last commit Jul 6, 2024

 (36 stars) (2 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-psdJavaScript

Check if a Buffer/Uint8Array is a PSD image

Last commit Aug 10, 2021

 (9 stars) (4 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-public-domainJavaScript

Check if a domain is public

Last commit Aug 10, 2021

 (15 stars) (3 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-reachableJavaScript

Check if servers are reachable

Last commit Feb 2, 2026

 (383 stars) (42 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-redirectJavaScript

Check if a number is a redirect HTTP status code

Last commit Apr 17, 2021

 (25 stars) (8 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-regexpJavaScript

Check if a value is a regular expression

Last commit Oct 31, 2021

 (26 stars) (8 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-relative-urlJavaScript

Check if a URL is relative

Last commit Sep 10, 2025

 (26 stars) (7 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-retry-allowedJavaScript

Check whether a request can be retried based on the `error.code`

Last commit Feb 10, 2022

 (81 stars) (17 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-rootJavaScript

Check if the process is running as root user, for example, one started with `sudo`

Last commit Jul 8, 2022

 (79 stars) (7 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-root-pathJavaScript

Check if a path is the root path. Example: / or C:\

Last commit Aug 10, 2021

 (10 stars) (2 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-safe-filenameJavaScript

Check if a filename is safe to use in a path join operation

Last commit Jan 25, 2026

 (13 stars) (2 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-safe-integerJavaScript

ES2015 Number.isSafeInteger() ponyfill

Last commit Jan 23, 2021

 (19 stars) (2 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-scopedJavaScript

Check if a string is a scoped npm package name

Last commit Jul 9, 2022

 (25 stars) (5 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-streamJavaScript

Check if something is a Node.js stream

Last commit Oct 28, 2024

 (116 stars) (22 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-supported-regexp-flagJavaScript

Check whether a RegExp flag is supported. Mostly useful for `y` and `u`.

Last commit Jul 9, 2022

 (8 stars) (6 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-svgJavaScript

Check if a string or buffer is SVG

Last commit Feb 15, 2026

 (144 stars) (21 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-text-pathJavaScript

Check if a file path is a text file

Last commit Apr 30, 2024

 (21 stars) (5 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-tifJavaScript

Check if a Buffer/Uint8Array is a TIFF image

Last commit Aug 9, 2021

 (11 stars) (5 forks) (0 indexed issues) (0 open good first issues)