is-number
A JavaScript utility that reliably checks if a value is a finite number, handling edge cases like strings, NaN, and Infinity.
What is is-number?
is-number is a JavaScript utility library that reliably checks whether a value is a finite number or a numeric string. It solves the problem of inconsistent number detection in JavaScript, where naive methods like `+value` or `Number()` can produce unexpected results for edge cases like empty strings, arrays, or NaN.
JavaScript and Node.js developers who need robust type validation for user input, parsed data, regex matches, or any scenario where distinguishing numbers from non-numbers is critical.
Developers choose is-number because it provides a performant, battle-tested solution that handles JavaScript's type coercion quirks consistently, reducing bugs and simplifying validation logic compared to manual checks.
Overview
JavaScript/Node.js utility. Returns true if the value is a number or string number. Useful for checking regex match results, user input, parsed strings, etc.
Use Cases
Best For
- Validating user input from forms or APIs to ensure numeric values
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