Mr. Robot helps you set robots meta tags and X-Robots-Tag headers as per Robots meta tag and X-Robots-Tag HTTP header specifications.

X-Robots-Tag HTTP Response Header

Set an X-Robots-Tag response header for all crawlers

var mrRobot = require('mr.robot')

app.get('/example', function(req, res) {
    mrRobot(res).noIndex().noFollow()
})

Results in the following response header

x-robots-tag: noindex, nofollow

Set an X-Robots-Tag response header for specific crawlers

var mrRobot = require('mr.robot')

app.get('/example', function(req, res) {
    mrRobot(res).noIndex('googlebot').noFollow('googlebot')
})

Results in the following response header

x-robots-tag: googlebot: noindex, nofollow

Due to https://github.com/nodejs/node/issues/3591 it is not currently possible to set directives for multiple user agents using the X-Robots-Tag response header. For the moment you can only do this with meta robots tags.

Meta Robots Tag

Rendering a robots meta tag for all crawlers (with Moustache)

var mrRobot = require('mr.robot')

app.get('/example', function(req, res) {
    mrRobot(res)
        .noIndex()
        .noFollow()
    res.render('example', { robots: mrRobot(res).meta })
})

example.tmpl

{{#robots}}
    <meta name="{{name}}" content="{{content}}" />
{{/robots}}

Results in the following output

   <meta name="robots" content="noindex, nofollow" />

Rendering a robots meta tag for specific crawlers (with Moustache)

app.get('/example', function(req, res) {
    mrRobot(res)
        .noIndex('googlebot')
        .noFollow('otherbot')
        .all('none')
    res.render('example', { robots: mrRobot(res).meta })
})

example.tmpl

{{#robots}}
    <meta name="{{name}}" content="{{content}}" />
{{/robots}}

Results in the following output

   <meta name="googlebot" content="noindex" />
   <meta name="otherbot" content="nofollow" />
   <meta name="robots" content="none" />

Supported Directives

| Directive | Alias | |-------------------|------------------------| | all | | | noindex | noIndex | | nofollow | noFollow | | none | | | noarchive | noArchive | | nosnipper | noSnipper | | noodp | noOpenDirectoryProject | | notranslate | noTranslate | | noimageindex | noImageIndex | | unavailable_after | unavailableAfter |

All methods accept an optional user agent name (e.g. 'googlebot') as their first parameter. unavailable_after/unavailableAfter requires an instance of Date, e.g.

mrRobot(res).unavailableAfter(new Date())
// or
mrRobot(res).unavailableAfter('googlebot', new Date())

Options

You can customise behaviour the first time you intialise mr.robot through the options parameter

mrRobot(res, options)

logger

Allows you to specify your own logger (otherwise mr.robot will use console), e.g.

var mrRobot = require('mr.robot')

app.get('/example', function(req, res) {
    mrRobot(res, { logger: myLogger }).noIndex('googlebot').noFollow('googlebot')
})

autoWrite

Controls whether mr.robot automatically writes headers before response.end(). If you disable this you must explicitly call write headers for them to be output, e.g.

var mrRobot = require('mr.robot')

app.get('/example', function(req, res) {
    mrRobot(res, { autoWrite: false }).noIndex('googlebot').noFollow('googlebot').writeHeader()
})