gtmetrix

Node.js module for the GTmetrix API to run and access tests.

• Node.js
• GTMetrix
• API documentation

Example

const gtmetrix = require ('gtmetrix') ({
  email: 'your@mail.tld',
  apikey: 'abc123'
});

// Run test from London with Google Chrome
const testDetails = {
  url: 'http://example.net/',
  location: 2,
  browser: 3
};

// Poll test every 5 seconds for completion, then log the result
gtmetrix.test.create (testDetails).then (data =>
  gtmetrix.test.get (data.test_id, 5000).then (console.log));

(For readability I left out the error handling)

Installation

npm i gtmetrix

You need an account at GTmetrix to get an API key. The API key can be found here when you are logged in.

Configuration

The setup function takes an object with these settings.

name	type	required	default	description
email	string	yes		Your account email
apikey	string	yes		Your account API key
timeout	int	no	5000	Wait timeout in ms

Example

const gtmetrix = require ('gtmetrix') ({
  email: 'your@mail.tld',
  apikey: 'abc123',
  timeout: 10000
});

Methods

All methods return promises, but you can also provide a callback function instead which gets the standard err and data arguments.

In the examples below I use a mix of callbacks and promises, but each method can do both. I also left out the error handling for better readability.

Errors

message	description	properties
request failed	Request cannot be made	error
invalid response	Can't process response	error statusCode contentType
API error	API returned an error	error statusCode contentType

test.create

( params, [callback] )

Run a test.

argument	type	required	description
params	object	yes	Test settings
callback	function	no	(err, data) or promise

API documentation

// Run test from London with Google Chrome
const test = {
  url: 'http://example.net/',
  location: 2,
  browser: 3
};

gtmetrix.test.create (test, console.log);

{ credits_left: 68,
  test_id: 'Ao0AYQbz',
  poll_state_url: 'https://gtmetrix.com/api/0.1/test/Ao0AYQbz' }

test.get

( testId, [resource], [polling], [callback] )

Get details about a test or one of its resources.

When you specify a binary resource, i.e. screenshot, the callback data will be a Buffer instance, so you can post-process the binary data however you like. See example below.

argument	type	required	description
testId	string	yes	Test id to look up
resource	string	no	Retrieve a test resource
polling	int	no	Retry until completion, in ms
callback	function	no	(err, data) or promise

API documentation

Test details

Get what is currently available, without waiting for completion.

gtmetrix.test.get ('Ao0AYQbz', console.log);

{ resources: {}, error: '', results: {}, state: 'started' }

Wait for completion and then get the details.

// Retry every 5 seconds (5000 ms)
gtmetrix.test.get ('Ao0AYQbz', 5000, console.log);

{ resources:
   { report_pdf: 'https://gtmetrix.com/api/0.1/test/Ao0AYQbz/report-pdf',
     pagespeed: 'https://gtmetrix.com/api/0.1/test/Ao0AYQbz/pagespeed',
     har: 'https://gtmetrix.com/api/0.1/test/Ao0AYQbz/har',
     pagespeed_files: 'https://gtmetrix.com/api/0.1/test/Ao0AYQbz/pagespeed-files',
     report_pdf_full: 'https://gtmetrix.com/api/0.1/test/Ao0AYQbz/report-pdf?full=1',
     yslow: 'https://gtmetrix.com/api/0.1/test/Ao0AYQbz/yslow',
     screenshot: 'https://gtmetrix.com/api/0.1/test/Ao0AYQbz/screenshot' },
  error: '',
  results:
   { onload_time: 185,
     first_contentful_paint_time: 221,
     page_elements: 2,
     report_url: 'https://gtmetrix.com/reports/example.net/Ao0AYQbz',
     redirect_duration: 0,
     first_paint_time: 221,
     dom_content_loaded_duration: null,
     dom_content_loaded_time: 184,
     dom_interactive_time: 183,
     page_bytes: 1911,
     page_load_time: 185,
     html_bytes: 277,
     fully_loaded_time: 307,
     html_load_time: 145,
     rum_speed_index: 221,
     yslow_score: 99,
     pagespeed_score: 99,
     backend_duration: 68,
     onload_duration: 0,
     connect_duration: 77 },
  state: 'completed' }

Retrieve screenshot

Retry every 5000 ms until it's ready.

const fs = require ('fs');

gtmetrix.test.get ('Ao0AYQbz', 'screenshot', 5000).then (data =>
  fs.writeFile (__dirname + '/screenshot.jpg', data, console.log));

Resources

resource	binary	content	description
filmstrip	yes	JPEG	Page loading filmstrip (requires video)
har	no	JS object	HTTP Archive
pagespeed	no	JS object	Pagespeed report
pagespeed-files	yes	ZIP	Pagespeed optimized files
report-pdf	yes	PDF	Test summary
report-pdf-full	yes	PDF	Full test report
screenshot	yes	JPEG	Screenshot image
video	yes	MP4	Page loading video
yslow	no	JS object	YSlow report

locations.list

( [callback] )

Get a list of available test locations.

argument	type	required	description
callback	function	no	(err, data) or promise

API documentation

gtmetrix.locations.list (console.log);

[ { name: 'Vancouver, Canada',
    default: true,
    id: '1',
    browsers: [ 1, 3 ] } ]

browsers.list

( [callback] )

Get a list of available test browsers.

argument	type	required	description
callback	function	no	(err, data) or promise

API documentation

gtmetrix.browsers.list (console.log);

[ { features:
     { dns: true,
       cookies: true,
       adblock: true,
       http_auth: true,
       video: true,
       user_agent: true,
       throttle: true,
       filtering: true,
       resolution: true },
    browser: 'firefox',
    name: 'Firefox (Desktop)',
    platform: 'desktop',
    id: 1,
    device: '' } ]

browsers.get

( browserId, [callback] )

Get details about a test browser.

argument	type	required	description
browserId	int	yes	Browser to look up
callback	function	no	(err, data) or promise

API documentation

gtmetrix.browsers.get (3, console.log);

{ features:
   { dns: true,
     cookies: true,
     adblock: true,
     http_auth: true,
     video: true,
     user_agent: true,
     throttle: true,
     filtering: true,
     resolution: true },
  browser: 'chrome',
  name: 'Chrome (Desktop)',
  platform: 'desktop',
  id: 3,
  device: '' }

account.status

( [callback] )

Information about your account.

argument	type	description
[callback]	function	(err, data) or promise

API documentation

gtmetrix.account.status (console.log);

{ api_refill: 1234567890, api_credits: 68 }

Unlicense

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to https://unlicense.org

Author

Franklin | Buy me a coffee