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A node.js BrowserID verification library

This repository contains a node.js library for local verification of BrowserID assertions. It is used by this standalone verifier.

The library has the following scope and features:

  • authoritative domain lookup - given a domain, follow the browserid standard to resolve it (following authority delagation) into the ultimatly responsible domain and its public key.
  • .well-known document parsing
  • (multiple) secondary IdP support - The library can be initialized with a set of trusted "fallback IdPs" that are considered authoritative when lookup fails (no support document can be found).
  • external HTTP implementation - You can use node.js's http implementation, or override it and support your own (useful for HTTP proxied environments)
  • command line tools - all of these features are exposed via command line tools for manual inspection of domain's persona configuration.
  • assertion verification - the features above all fuel a simple yet flexible API for local verification of assertions.


This library is targeted at robust local verification, to subsume all of the features required by mozilla's implementation of assertion verification in Persona. If you're looking for a clean and simple library appropriate for website use (using the verifier hosted by persona), see browserid-verify.


npm install persona-verifier-lib

(simple) verifying an assertion

var browserid = require('browserid-local-verify');

  assertion: assertion,
  audience:  ""
}, function(err, details) {

looking up an authority for a domain

var browserid = require('browserid-local-verify');

  domain: ""
}, function(err, details) {
  // check err


All functions accept configuration parameters documented below.

  httpTimeout: 5.0,
  domain: ""
}, function(err, details) {

Or you can allocate a library instance. This allows you to specify configuration once at instantiation time. Any configuration parameters or function arguments may be specified a instantiation time and become the default for subsequently invoked functions:

var BrowserID = require('browserid-local-verify');

var b = new BrowserID({ httpTimeout: 20.0 });
b.lookup({ domain: "" }, function(err, details) {
  // ...

Configuration and Arguments

Common Arguments

  • httpRequest: A function that allows the client to control how http requests are performed.
    • input arguments: (domain, path, callback)
    • callback argbuments: (err, statusCode, headers, body)
  • httpTimeout: How long in seconds we should wait for a response when looking up a well-known document over HTTP. (default: 10)
  • maxDelegations: How many times authority may be delegated.
  • insecureSSL: When true, invalid SSL certificates are ignored (NEVER use this in production).
  • fallback: A domain that is authoritative when support document lookup fails for the prinicpal email address's domain.

lookup specific

  • domain: the domain for which we should lookup the support document
  • principalDomain: the domain of the email address for which we should discover the support document of the authority

verification specific

  • now: override the current time for purposes of assertion verification. (useful for testing)
  • assertion: the assertion to verify
  • audience: the expected assertion audience
  • trustedIssuers: An array of domains that will be trusted to vouch for any identity, regardless of the authority as determined from the email addresses domain.

debug output and metrics

The BrowserID class emits events:

var b = new BrowserID();

b.on('debug', function(msg) {
  console.log('debug output:', msg);

b.on('metric', function(metric, value) {
  console.log(metric + ":", value);

b.lookup("", function(err, details) {
  // ...




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npm i browserid-local-verify

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