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Is ecdsa-sig-formatter ESM-only? Can you require() it?

Translate ECDSA signatures between ASN.1/DER and JOSE-style concatenation

Last verified Sep 9, 2026 against ecdsa-sig-formatter@1.0.11. JSON

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

ecdsa-sig-formatter ships CommonJS only. require("ecdsa-sig-formatter") works everywhere. import "ecdsa-sig-formatter" 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.

Latest
1.0.11 (Jan 25, 2019)
Module format
CommonJS
Last CommonJS version
1.0.11
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
39.1M
License
Apache-2.0

Does ecdsa-sig-formatter@1.0.11 actually load? Runtime test results

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

Runtimerequire("ecdsa-sig-formatter")import "ecdsa-sig-formatter"
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 ecdsa-sig-formatter

ES modules (import)

import ecdsaSigFormatter from "ecdsa-sig-formatter";

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 ecdsaSigFormatter = require("ecdsa-sig-formatter");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (10 versions; the newest 10 shown).

VersionsFormatFirst published
1.0.0 – 1.0.11CommonJSJun 10, 2015

Frequently asked

Is ecdsa-sig-formatter ESM-only?

ecdsa-sig-formatter@1.0.11 is a CommonJS package. ecdsa-sig-formatter ships CommonJS only. require("ecdsa-sig-formatter") works everywhere. import "ecdsa-sig-formatter" 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 ecdsa-sig-formatter with ES module syntax?

Yes. import ecdsaSigFormatter from "ecdsa-sig-formatter" 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 ecdsa-sig-formatter work in Bun?

Yes. import "ecdsa-sig-formatter" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does ecdsa-sig-formatter ship TypeScript types?

Yes. ecdsa-sig-formatter bundles its own type declarations; no @types package is needed.

Links

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