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fido2-lib

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What fido2-lib is

fido2-lib is an open-source JavaScript library for implementing FIDO 2.0 and WebAuthn server functionality. Its four primary functions create attestation and assertion challenges, then parse and validate responses from clients. It does not implement a networking protocol such as REST endpoints, so applications can use their own messaging protocol. The calling application must associate each challenge with a session and match it to the corresponding response.

The library lists support for packed, TPM, deprecated Android SafetyNet, FIDO U2F, none and Apple attestation formats. Its APIs allow developers to add attestation formats and extensions. Metadata service support provides authenticator root-of-trust and metadata, including support for multiple FIDO Metadata Service versions from 1 through 3. Listed cryptographic capabilities include ECDSA and RSA, x509 certificate parsing and PKITS chain validation. Returned results include parsed and validated data as well as additional audit data for risk engines.

fido2-lib supports CommonJS and ESM, with installation and import examples for Node.js and Deno. The listed platforms include Node.js, Deno and web browsers using WebAuthn; Windows Hello is also listed as supported. The software is MIT-licensed and can be installed through npm or imported from Deno’s deno.land repository.

Who it suits

fido2-lib suits JavaScript developers building FIDO 2.0 or WebAuthn server functionality into an application. It is particularly relevant when the application can manage challenge-to-session matching and choose its own networking protocol.

What it does well

  • Free and MIT-licensed.
  • Supports Node.js and Deno.
  • Supports CommonJS and ESM.
  • Includes multiple attestation formats and extensibility APIs.
  • Returns additional audit data for risk engines.

What to know first

  • The calling application must track challenges and sessions.
  • The library does not provide networking endpoints.
  • The GitHub Releases page lists no releases.

Limits

The library does not track sessions or challenge context; the calling application must associate each challenge with a session and match it to the response.

Plans

PlanBilled and limitsPrice
fido2-libMIT-licensed library · no pricing plans statedFree

As github.com lists them, read 5 Oct 2026. The maker's own page has the final word.

Getting started

  1. Open the project repository on GitHub.
  2. Install the library through npm for Node.js, or import it from Deno’s deno.land repository.
  3. Use the Node.js or Deno installation and import examples.
  4. Choose and implement the application's networking protocol.
  5. Associate each challenge with a session so its response can be matched.

Verdict

Choose fido2-lib if you need a free, self-hosted JavaScript library for FIDO 2.0 and WebAuthn server functionality. Applications that need the library to provide networking endpoints or manage challenge sessions will need to handle those responsibilities themselves.

Questions

Is fido2-lib free?

Yes. It is provided under the MIT License, and the listed plan costs nothing.

Is fido2-lib open source?

Yes. It is MIT-licensed. The license permits use, copying, modification, distribution, sublicensing and sale subject to its conditions.

Which platforms does it support?

The listed platforms are Node.js, Deno and web browsers using WebAuthn. Windows Hello is also listed as supported.

How can I install or import it?

The README shows installation through npm and import from Deno’s deno.land repository. It provides Node.js and Deno examples.

Does fido2-lib provide REST endpoints or manage sessions?

It does not implement a networking protocol such as REST endpoints, and it does not track sessions or context. The calling application must manage challenge-to-session matching.

Which attestation formats are listed?

They are packed, TPM, deprecated Android SafetyNet, FIDO U2F, none and Apple.

Facts from fido2-lib's own pages

Attestation formats
Listed attestation formats are packed, TPM, deprecated Android SafetyNet, FIDO U2F, none, and Apple. · github.com, 5 Oct 2026
Audit data
The library returns parsed and validated data together with extra audit data for risk engines. · github.com, 5 Oct 2026
Challenge handling
The library does not track sessions or context, so the caller is expected to associate each challenge with a session to match it with a response. · github.com, 5 Oct 2026
Cryptography
The listed crypto families are ECDSA and RSA, with x509 certificate parsing and PKITS chain validation. · github.com, 5 Oct 2026
Downloads
The README shows installation through npm and import from Deno's deno.land repository; the GitHub Releases page says there are no releases. · github.com, 5 Oct 2026
Extensibility
The library provides APIs for adding attestation formats and extensions. · github.com, 5 Oct 2026
Integration examples
The README points to OWASP Single Sign-On and webauthn.io for working examples. · github.com, 5 Oct 2026
License
The software is provided under the MIT License, which grants free use, copying, modification, distribution, sublicensing, and sale subject to its conditions. · github.com, 5 Oct 2026
Metadata
Metadata service support provides authenticator root-of-trust and metadata, including support for multiple services such as FIDO MDS 1–3. · github.com, 5 Oct 2026
Protocol independence
The library does not implement a networking protocol such as REST endpoints, so it can remain independent of messaging protocols. · github.com, 5 Oct 2026
Purpose
fido2-lib is a Node.js library for implementing FIDO 2.0 and WebAuthn server functionality. · github.com, 5 Oct 2026
Registration and authentication
Its four primary functions create attestation and assertion challenges and parse and validate the client responses. · github.com, 5 Oct 2026
Runtime and modules
The README provides Node.js and Deno installation and import examples, and says CommonJS and ESM are supported natively. · github.com, 5 Oct 2026
Security reporting
The security policy asks reporters not to post vulnerabilities in public GitHub issues and says to use private vulnerability reporting or contact the lead maintainer; it says a response should arrive within 48 hours. · github.com, 5 Oct 2026
Windows Hello
The project lists Windows Hello as supported. · github.com, 5 Oct 2026

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