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    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/proxy-addr package

    2.0.7 • Public • Published


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    Determine address of proxied request


    This is a Node.js module available through the npm registry. Installation is done using the npm install command:

    $ npm install proxy-addr


    var proxyaddr = require('proxy-addr')

    proxyaddr(req, trust)

    Return the address of the request, using the given trust parameter.

    The trust argument is a function that returns true if you trust the address, false if you don't. The closest untrusted address is returned.

    proxyaddr(req, function (addr) { return addr === '' })
    proxyaddr(req, function (addr, i) { return i < 1 })

    The trust arugment may also be a single IP address string or an array of trusted addresses, as plain IP addresses, CIDR-formatted strings, or IP/netmask strings.

    proxyaddr(req, '')
    proxyaddr(req, ['', ''])
    proxyaddr(req, ['', ''])

    This module also supports IPv6. Your IPv6 addresses will be normalized automatically (i.e. fe80::00ed:1 equals fe80:0:0:0:0:0:ed:1).

    proxyaddr(req, '::1')
    proxyaddr(req, ['::1/128', 'fe80::/10'])

    This module will automatically work with IPv4-mapped IPv6 addresses as well to support node.js in IPv6-only mode. This means that you do not have to specify both ::ffff:a00:1 and

    As a convenience, this module also takes certain pre-defined names in addition to IP addresses, which expand into IP addresses:

    proxyaddr(req, 'loopback')
    proxyaddr(req, ['loopback', 'fc00:ac:1ab5:fff::1/64'])
    • loopback: IPv4 and IPv6 loopback addresses (like ::1 and
    • linklocal: IPv4 and IPv6 link-local addresses (like fe80::1:1:1:1 and
    • uniquelocal: IPv4 private addresses and IPv6 unique-local addresses (like fc00:ac:1ab5:fff::1 and

    When trust is specified as a function, it will be called for each address to determine if it is a trusted address. The function is given two arguments: addr and i, where addr is a string of the address to check and i is a number that represents the distance from the socket address.

    proxyaddr.all(req, [trust])

    Return all the addresses of the request, optionally stopping at the first untrusted. This array is ordered from closest to furthest (i.e. arr[0] === req.connection.remoteAddress).


    The optional trust argument takes the same arguments as trust does in proxyaddr(req, trust).

    proxyaddr.all(req, 'loopback')


    Compiles argument val into a trust function. This function takes the same arguments as trust does in proxyaddr(req, trust) and returns a function suitable for proxyaddr(req, trust).

    var trust = proxyaddr.compile('loopback')
    var addr = proxyaddr(req, trust)

    This function is meant to be optimized for use against every request. It is recommend to compile a trust function up-front for the trusted configuration and pass that to proxyaddr(req, trust) for each request.


    $ npm test


    $ npm run-script bench




    npm i proxy-addr

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    • dougwilson