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sindresorhus/is-observableJavaScript

Check if a value is an Observable

Last commit Jun 6, 2022

 (43 stars) (8 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-onlineJavaScript

Check if the internet connection is up

Last commit Nov 15, 2025

 (1,361 stars) (89 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-online-cliJavaScript

Check if the internet connection is up

Last commit Sep 11, 2025

 (74 stars) (4 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-path-cwdJavaScript

Check if a path is the current working directory

Last commit May 10, 2025

 (22 stars) (9 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-path-in-cwdJavaScript

Check if a path is in the current working directory

Last commit May 3, 2021

 (23 stars) (6 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-path-insideJavaScript

Check if a path is inside another path

Last commit Sep 11, 2025

 (40 stars) (15 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-plain-objJavaScript

Check if a value is a plain object

Last commit May 4, 2024

 (104 stars) (9 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-pngJavaScript

Check if a Buffer/Uint8Array is a PNG image

Last commit Jul 8, 2022

 (48 stars) (4 forks) (0 indexed issues) (0 open good first issues)
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)