canirequire › CommonJS › ajv
Is ajv ESM-only? Can you require() it?
Another JSON Schema Validator
Last verified Sep 9, 2026 against ajv@8.20.0. JSON
CommonJS CommonJS — require() works on every Node.js version
ajv ships CommonJS only. require("ajv") works everywhere. import "ajv" 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.
Does ajv@8.20.0 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("ajv") from a CommonJS file and import "ajv" from an ES module.
| Runtime | require("ajv") | import "ajv" |
|---|---|---|
| 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 ajv
ES modules (import)
import ajv from "ajv";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 ajv = require("ajv");Module format by version
Derived from the type, main and exports fields of every stable release on npm (315 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 6.9.1 – 8.20.0 | CommonJS | Feb 10, 2019 |
Frequently asked
Is ajv ESM-only?
ajv@8.20.0 is a CommonJS package. ajv ships CommonJS only. require("ajv") works everywhere. import "ajv" 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 ajv with ES module syntax?
Yes. import ajv from "ajv" 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 ajv work in Bun?
Yes. import "ajv" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does ajv ship TypeScript types?
Yes. ajv bundles its own type declarations; no @types package is needed.
Links
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