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

> fast-uri@4.1.4 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Dependency-free RFC 3986 URI toolbox

Last verified Sep 9, 2026 against fast-uri@4.1.4.

fast-uri ships CommonJS only. require("fast-uri") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "fast-uri" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

## What to do

1. require("fast-uri") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
2. From ES modules use the default import: import fastUri from "fast-uri"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 4.1.4 (Sep 2, 2026)
- Module format: CommonJS
- Last CommonJS version: 4.1.4
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 94.1M
- License: BSD-3-Clause

## Runtime test results for fast-uri@4.1.4

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

| Runtime | require("fast-uri") | import "fast-uri" |
|---|---|---|
| Node.js 18 | works | 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 fast-uri

ES modules:

```js
import fastUri from "fast-uri";
```

CommonJS:

```js
const fastUri = require("fast-uri");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (38 versions; the newest 38 shown).

| Versions | Format | First published |
|---|---|---|
| 0.0.1 – 4.1.4 | CommonJS | Dec 12, 2021 |

## Frequently asked

**Is fast-uri ESM-only?**

fast-uri@4.1.4 is a CommonJS package. fast-uri ships CommonJS only. require("fast-uri") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "fast-uri" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

**Can I import fast-uri with ES module syntax?**

Yes. import fastUri from "fast-uri" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

**Does fast-uri work in Bun?**

Yes. import "fast-uri" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does fast-uri ship TypeScript types?**

Yes. fast-uri bundles its own type declarations; no @types package is needed.

## Links

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

---

For scripts and AI agents: any package is at https://canirequire.com/package/<name>/index.md (Markdown) or https://canirequire.com/package/<name>.json (JSON); the site index is https://canirequire.com/llms.txt. Fetch the URL directly; no search needed.