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Is async-validator ESM-only? Can you require() it?

validate form asynchronous

Last verified Sep 9, 2026 against async-validator@4.2.5. JSON

CommonJS CommonJS — require() works on every Node.js version

async-validator ships CommonJS only. require("async-validator") works everywhere. import "async-validator" 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.

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

Latest
4.2.5 (Jun 17, 2022)
Module format
CommonJS
Last CommonJS version
4.2.5
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
1.6M
License
MIT

Does async-validator@4.2.5 actually load? Runtime test results

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

Runtimerequire("async-validator")import "async-validator"
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✓ works✓ works

How to import async-validator

ES modules (import)

import asyncValidator from "async-validator";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const asyncValidator = require("async-validator");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (86 versions; the newest 60 shown).

VersionsFormatFirst published
1.6.1 – 4.2.5CommonJSMar 30, 2016

Frequently asked

Is async-validator ESM-only?

async-validator@4.2.5 is a CommonJS package. async-validator ships CommonJS only. require("async-validator") works everywhere. import "async-validator" 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 async-validator with ES module syntax?

Yes. import asyncValidator from "async-validator" 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 async-validator work in Bun?

Yes. import "async-validator" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does async-validator ship TypeScript types?

Yes. async-validator bundles its own type declarations; no @types package is needed.

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