# Is strnum ESM-only? Can you require() it?

> strnum@2.4.2 is ESM-only. ESM-only since 2.0.0 — last CommonJS version is 1.1.2.

Parse String to Number based on configuration

Last verified Sep 9, 2026 against strnum@2.4.2.

strnum dropped its CommonJS build in 2.0.0 (February 2025). The last version with a plain require()-able CommonJS entry is 1.1.2, published Feb 26, 2025.

On Node.js 20.19+, 22.12+ and newer, require("strnum") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("strnum") fails with ERR_REQUIRE_ESM.

## What to do

1. On Node.js 20.19+, 22.12+ and newer, require("strnum") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
2. From a CommonJS file, use a dynamic import inside an async function: const strnum = await import("strnum"). That works on every Node.js version the package supports.
3. If you need a synchronous require() or run Node.js 18: npm install strnum@1.1.2, the last CommonJS release (published Feb 26, 2025).
4. TypeScript: no types are available for strnum; declare the module yourself if you need them.

## Facts

- Latest: 2.4.2 (Aug 14, 2026)
- Module format: ESM-only
- Last CommonJS version: 1.1.2
- ESM-only since: 2.0.0 (Feb 20, 2025)
- TypeScript types: none
- Node engines: not declared
- Weekly downloads: 50.1M
- License: MIT

## Runtime test results for strnum@2.4.2

Installed and executed on Sep 9, 2026 with require("strnum") from a CommonJS file and import "strnum" from an ES module.

| Runtime | require("strnum") | import "strnum" |
|---|---|---|
| Node.js 18 | fails (ERR_REQUIRE_ESM) | works |
| Node.js 20 | works | works |
| Node.js 22 | works | works |
| Node.js 24 | works | works |
| Node.js 26 | works | works |
| Bun 1.4.0 | works | works |

## How to import strnum

ES modules:

```js
import * as strnum from "strnum";
```

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS:

```js
// Node.js 20.19+, 22.12+ and newer (verified):
const strnum = require("strnum");

// Any Node.js version the package supports, from an async function:
async function main() {
  const strnum = await import("strnum");
}

// Or pin the last CommonJS release:
// npm install strnum@1.1.2
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (25 versions; the newest 25 shown).

| Versions | Format | First published |
|---|---|---|
| 2.0.0 – 2.4.2 | ESM-only | Feb 20, 2025 |
| 1.0.1 – 1.1.2 | CommonJS | Sep 5, 2021 |

## Frequently asked

**Is strnum ESM-only?**

strnum@2.4.2 is ESM-only. strnum dropped its CommonJS build in 2.0.0 (February 2025). The last version with a plain require()-able CommonJS entry is 1.1.2, published Feb 26, 2025.

**Which version of strnum still supports CommonJS / require()?**

1.1.2 is the last version of strnum with a CommonJS build. Install it with "npm install strnum@1.1.2". Every version from 2.0.0 on is ESM-only.

**How do I use strnum from a CommonJS file?**

From a CommonJS file, use a dynamic import inside an async function: const strnum = await import("strnum"). That works on every Node.js version the package supports. On Node.js 20.19+, 22.12+ and newer, require("strnum") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin strnum@1.1.2.

**Does strnum work in Bun?**

Yes. import "strnum" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does strnum ship TypeScript types?**

No. strnum ships no type declarations and there is no @types package for it.

## Links

- [strnum on npm](https://www.npmjs.com/package/strnum)
- [Source repository](https://github.com/NaturalIntelligence/strnum)
- [HTML version](https://canirequire.com/package/strnum/)
- [JSON version](https://canirequire.com/package/strnum.json)

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