Is

Type check values with ease.

EstablishedOpen SourceLow lock-in
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Pricing

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Flat rate

Adoption

→Stable

License

Open Source

Data freshness

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Overview

What is Is?

A utility for type checking values in JavaScript and TypeScript. It simplifies the process of verifying types, making it easier to write robust code that handles different data types gracefully.

Key differentiator

“Provides a lightweight and reliable way to check types in JavaScript and TypeScript, making it easier for developers to write robust code without the overhead of more complex solutions.”

Capability profile

Strength Radar

Simplified type …Extensive test c…Lightweight and …

Honest assessment

Strengths & Weaknesses

↑ Strengths

Simplified type checking for various data types.

Extensive test coverage to ensure reliability.

Lightweight and easy to integrate into projects.

Fit analysis

Who is it for?

✓ Best for

JavaScript and TypeScript developers who need a reliable way to check types in their applications.

Projects that require robust input validation for functions or APIs.

✕ Not a fit for

Scenarios where complex type checking is required beyond basic data types.

Use cases requiring real-time type inference or dynamic typing capabilities.

Cost structure

Pricing

Free Tier

None

Starts at

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Model

Flat rate

Enterprise

None

Performance benchmarks

How Fast Is It?

Next step

Get Started with Is

Step-by-step setup guide with code examples and common gotchas.

View Setup Guide →