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WebPageTest API

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WebPageTest API


I’m willing to bet you know WebPageTest. It is the premier tool in the toolbox of web performance people. Maybe you didn’t know that WebPageTest was a side project of one fella, Patrick Meenan, for most of its lifetime, with literal racks of real devices he maintained himself. An amazing achievement, to be sure, but it also feels good to me that WebPageTest is now owned by Catchpoint with Patrick being there himself on the project. For one thing, the design of WebPageTest is now quite nice. A welcome upgrade, let’s say.

So yes, WebPageTest is still here. It’s still free. Everything is there that always was, but more (like… Chrome User Experience Data pulled right into your Chrome test results so you can see how closely your test matches what Chrome is seeing, and Core Web visualizations right in the waterfall). It’s just now it’s not a side project anymore, it’s got the support of a company dead-focused on helping developers.

And you’ll get exactly that from the API. And so much more. Anything WebPageTest can do is available in the API.

This is not some tack-on API. This is an entirely API-driven product. So if WebPageTest evolves and offers more functionality (and it will), you’ll have it in the API. A dog-fooded API is an API you can trust. Catchpoint is very likely to do more with WebPageTest over time, and it will be driven by these same APIs. I think that’s important to know. You can trust an API a lot more when the API drives the product, versus when an API is tacked on to a product.

Example JSON Data from API
{
   "data":{
      "id":"210427_AiDcXW_8bd098a817944af61f7db97e4463e622",
      "url":"https://docs.webpagetest.org/",
      "summary":"https://www.webpagetest.org/results.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622",
      "testUrl":"https://docs.webpagetest.org/",
      "location":"ec2-us-east-1:Chrome",
      "from":"Virginia USA - EC2  - <b>Chrome</b> - <b>Emulated Motorola G (gen 4)</b> - <b>4G</b>",
      "connectivity":"4G",
      "bwDown":9000,
      "bwUp":9000,
      "latency":170,
      "plr":null,
      "shaperLimit":0,
      "mobile":1,
      "completed":1619530566,
      "testRuns":1,
      "fvonly":true,
      "successfulFVRuns":1,
      "average":{
         "firstView":{
            "loadTime":1805,
            "docTime":1805,
            "fullyLoaded":3453,
            "bytesOut":21486,
            "bytesOutDoc":9612,
            "bytesIn":96520,
            "bytesInDoc":92826,
            "requests":12,
            "requestsFull":12,
            "requestsDoc":6,
            "responses_200":12,
            "responses_404":0,
            "responses_other":0,
            "result":0,
            "testStartOffset":0,
            "cached":0,
            "optimization_checked":1,
            "start_epoch":0,
            "loadEventStart":1805,
            "loadEventEnd":1805,
            "domContentLoadedEventStart":876,
            "domContentLoadedEventEnd":876,
            "connections":5,
            "final_base_page_request":0,
            "firstPaint":865.0500000076,
            "firstContentfulPaint":865,
            "firstMeaningfulPaint":865,
            "domInteractive":875,
            "firstImagePaint":995,
            "TTFB":730,
            "basePageSSLTime":203,
            "score_cache":94,
            "score_cdn":100,
            "score_gzip":100,
            "score_cookies":-1,
            "score_keep-alive":100,
            "score_minify":-1,
            "score_combine":-1,
            "score_compress":100,
            "score_etags":-1,
            "score_progressive_jpeg":-1,
            "gzip_total":28624,
            "gzip_savings":0,
            "minify_total":-1,
            "minify_savings":-1,
            "image_total":67481,
            "image_savings":0,
            "cpu.UpdateLayerTree":11,
            "cpu.EventDispatch":1,
            "cpu.CommitLoad":0,
            "cpu.EvaluateScript":46,
            "cpu.v8.compile":4,
            "cpu.ParseHTML":37,
            "cpu.UpdateLayoutTree":5,
            "cpu.Layout":30,
            "cpu.ResourceChangePriority":0,
            "cpu.Paint":3,
            "cpu.largestContentfulPaint::Candidate":0,
            "cpu.MarkDOMContent":0,
            "cpu.FunctionCall":5,
            "cpu.HitTest":0,
            "cpu.MarkLoad":0,
            "cpu.XHRReadyStateChange":2,
            "cpu.XHRLoad":0,
            "cpu.Idle":3309,
            "date":1619530556.95751,
            "throttle_cpu_requested":3.5,
            "throttle_cpu":2.7715020391,
            "fullyLoadedCPUms":6859,
            "fullyLoadedCPUpct":57.6955424727,
            "domElements":103,
            "domComplete":1805,
            "PerformancePaintTiming.first-paint":865.0500000076,
            "PerformancePaintTiming.first-contentful-paint":865.0500000076,
            "test_run_time_ms":8968,
            "Colordepth":24,
            "lastVisualChange":1000,
            "visualComplete":1000,
            "render":900,
            "SpeedIndex":902,
            "visualComplete85":900,
            "visualComplete90":900,
            "visualComplete95":900,
            "visualComplete99":1000,
            "chromeUserTiming.navigationStart":0,
            "chromeUserTiming.fetchStart":2,
            "chromeUserTiming.responseEnd":735,
            "chromeUserTiming.unloadEventStart":737,
            "chromeUserTiming.unloadEventEnd":737,
            "chromeUserTiming.commitNavigationEnd":739,
            "chromeUserTiming.domLoading":740,
            "chromeUserTiming.firstMeaningfulPaint":865,
            "chromeUserTiming.firstMeaningfulPaintCandidate":865,
            "chromeUserTiming.firstContentfulPaint":865,
            "chromeUserTiming.firstPaint":865,
            "chromeUserTiming.domInteractive":874,
            "chromeUserTiming.domContentLoadedEventStart":875,
            "chromeUserTiming.domContentLoadedEventEnd":875,
            "chromeUserTiming.firstImagePaint":994,
            "chromeUserTiming.domComplete":1804,
            "chromeUserTiming.loadEventStart":1804,
            "chromeUserTiming.loadEventEnd":1804,
            "chromeUserTiming.LargestTextPaint":865,
            "chromeUserTiming.LargestContentfulPaint":865,
            "chromeUserTiming.LargestImagePaint":994,
            "chromeUserTiming.TotalLayoutShift":0,
            "chromeUserTiming.CumulativeLayoutShift":0,
            "maxFID":0,
            "TTIMeasurementEnd":3458,
            "LastInteractive":900,
            "TotalBlockingTime":0,
            "run":1,
            "step":1,
            "effectiveBps":35446,
            "effectiveBpsDoc":86349,
            "domTime":0,
            "aft":0,
            "titleTime":0,
            "domLoading":0,
            "server_rtt":0,
            "smallImageCount":4,
            "bigImageCount":0,
            "maybeCaptcha":0,
            "avgRun":1
         }
      },
      "standardDeviation":{
         "firstView":{
            "loadTime":0,
            "docTime":0,
            "fullyLoaded":0,
            "bytesOut":0,
            "bytesOutDoc":0,
            "bytesIn":0,
            "bytesInDoc":0,
            "requests":0,
            "requestsFull":0,
            "requestsDoc":0,
            "responses_200":0,
            "responses_404":0,
            "responses_other":0,
            "result":0,
            "testStartOffset":0,
            "cached":0,
            "optimization_checked":0,
            "start_epoch":0,
            "loadEventStart":0,
            "loadEventEnd":0,
            "domContentLoadedEventStart":0,
            "domContentLoadedEventEnd":0,
            "connections":0,
            "final_base_page_request":0,
            "firstPaint":0,
            "firstContentfulPaint":0,
            "firstMeaningfulPaint":0,
            "domInteractive":0,
            "firstImagePaint":0,
            "TTFB":0,
            "basePageSSLTime":0,
            "score_cache":0,
            "score_cdn":0,
            "score_gzip":0,
            "score_cookies":0,
            "score_keep-alive":0,
            "score_minify":0,
            "score_combine":0,
            "score_compress":0,
            "score_etags":0,
            "score_progressive_jpeg":0,
            "gzip_total":0,
            "gzip_savings":0,
            "minify_total":0,
            "minify_savings":0,
            "image_total":0,
            "image_savings":0,
            "cpu.UpdateLayerTree":0,
            "cpu.EventDispatch":0,
            "cpu.CommitLoad":0,
            "cpu.EvaluateScript":0,
            "cpu.v8.compile":0,
            "cpu.ParseHTML":0,
            "cpu.UpdateLayoutTree":0,
            "cpu.Layout":0,
            "cpu.ResourceChangePriority":0,
            "cpu.Paint":0,
            "cpu.largestContentfulPaint::Candidate":0,
            "cpu.MarkDOMContent":0,
            "cpu.FunctionCall":0,
            "cpu.HitTest":0,
            "cpu.MarkLoad":0,
            "cpu.XHRReadyStateChange":0,
            "cpu.XHRLoad":0,
            "cpu.Idle":0,
            "date":0,
            "throttle_cpu_requested":0,
            "throttle_cpu":0,
            "fullyLoadedCPUms":0,
            "fullyLoadedCPUpct":0,
            "domElements":0,
            "domComplete":0,
            "PerformancePaintTiming.first-paint":0,
            "PerformancePaintTiming.first-contentful-paint":0,
            "test_run_time_ms":0,
            "Colordepth":0,
            "lastVisualChange":0,
            "visualComplete":0,
            "render":0,
            "SpeedIndex":0,
            "visualComplete85":0,
            "visualComplete90":0,
            "visualComplete95":0,
            "visualComplete99":0,
            "chromeUserTiming.navigationStart":0,
            "chromeUserTiming.fetchStart":0,
            "chromeUserTiming.responseEnd":0,
            "chromeUserTiming.unloadEventStart":0,
            "chromeUserTiming.unloadEventEnd":0,
            "chromeUserTiming.commitNavigationEnd":0,
            "chromeUserTiming.domLoading":0,
            "chromeUserTiming.firstMeaningfulPaint":0,
            "chromeUserTiming.firstMeaningfulPaintCandidate":0,
            "chromeUserTiming.firstContentfulPaint":0,
            "chromeUserTiming.firstPaint":0,
            "chromeUserTiming.domInteractive":0,
            "chromeUserTiming.domContentLoadedEventStart":0,
            "chromeUserTiming.domContentLoadedEventEnd":0,
            "chromeUserTiming.firstImagePaint":0,
            "chromeUserTiming.domComplete":0,
            "chromeUserTiming.loadEventStart":0,
            "chromeUserTiming.loadEventEnd":0,
            "chromeUserTiming.LargestTextPaint":0,
            "chromeUserTiming.LargestContentfulPaint":0,
            "chromeUserTiming.LargestImagePaint":0,
            "chromeUserTiming.TotalLayoutShift":0,
            "chromeUserTiming.CumulativeLayoutShift":0,
            "maxFID":0,
            "TTIMeasurementEnd":0,
            "LastInteractive":0,
            "TotalBlockingTime":0,
            "run":0,
            "step":0,
            "effectiveBps":0,
            "effectiveBpsDoc":0,
            "domTime":0,
            "aft":0,
            "titleTime":0,
            "domLoading":0,
            "server_rtt":0,
            "smallImageCount":0,
            "bigImageCount":0,
            "maybeCaptcha":0,
            "avgRun":null
         }
      },
      "median":{
         "firstView":{
            "numSteps":1,
            "run":1,
            "tester":"i-0247aadaa23ac9fec",
            "loadTime":1805,
            "docTime":1805,
            "fullyLoaded":3453,
            "bytesOut":21486,
            "bytesOutDoc":9612,
            "bytesIn":96520,
            "bytesInDoc":92826,
            "requests":[
               {
                  "type":3,
                  "id":"8F26376CBD35F32E850C9DBEC39882D4",
                  "request_id":"8F26376CBD35F32E850C9DBEC39882D4",
                  "ip_addr":"52.203.36.44",
                  "full_url":"https://docs.webpagetest.org/",
                  "is_secure":1,
                  "method":"GET",
                  "host":"docs.webpagetest.org",
                  "url":"https://css-tricks.com/",
                  "raw_id":"8F26376CBD35F32E850C9DBEC39882D4",
                  "frame_id":"E57BDA2151E08AC948685BFE69680D5E",
                  "documentURL":"https://docs.webpagetest.org/",
                  "responseCode":200,
                  "request_type":"Document",
                  "load_ms":178,
                  "ttfb_ms":173,
                  "load_start":557,
                  "load_start_float":556.647,
                  "bytesIn":5465,
                  "objectSize":5465,
                  "objectSizeUncompressed":22360,
                  "chunks":[
                     {
                        "ts":734.825,
                        "bytes":5465
                     }
                  ],
                  "expires":"",
                  "cacheControl":"max-age=900,must-revalidate",
                  "contentType":"text/html",
                  "contentEncoding":"br",
                  "socket":42,
                  "protocol":"HTTP/2",
                  "dns_start":4,
                  "dns_end":182,
                  "connect_start":182,
                  "connect_end":353,
                  "ssl_start":353,
                  "ssl_end":556,
                  "securityDetails":{
                     "protocol":"TLS 1.3",
                     "keyExchange":"",
                     "keyExchangeGroup":"X25519",
                     "cipher":"AES_256_GCM",
                     "certificateId":0,
                     "subjectName":"docs.webpagetest.org",
                     "sanList":[
                        "docs.webpagetest.org"
                     ],
                     "issuer":"R3",
                     "validFrom":1619467227,
                     "validTo":1627243227,
                     "signedCertificateTimestampList":[
                        {
                           "status":"Verified",
                           "origin":"Embedded in certificate",
                           "logDescription":"Sectigo 'Mammoth' CT log",
                           "logId":"6F5376AC31F03119D89900A45115FF77151C11D902C10029068DB2089A37D913",
                           "timestamp":1619470827302,
                           "hashAlgorithm":"SHA-256",
                           "signatureAlgorithm":"ECDSA",
                           "signatureData":"3046022100A2BCD9F63B5797CB092A1186C47BBA07159B64A547AB70F712A2365232D80C29022100D0F30E54E297A03A68369920C0D941D7A0FF3840478D681039FC4156BF21BA81"
                        },
                        {
                           "status":"Verified",
                           "origin":"Embedded in certificate",
                           "logDescription":"Google 'Xenon2021' log",
                           "logId":"7D3EF2F88FFF88556824C2C0CA9E5289792BC50E78097F2E6A9768997E22F0D7",
                           "timestamp":1619470827299,
                           "hashAlgorithm":"SHA-256",
                           "signatureAlgorithm":"ECDSA",
                           "signatureData":"3045022069E20E80E8FBAF20B7DE722D0104F91084379684D20200DD621EAD7A7254C0930221008C377DFEC43CB8395661CEC67259D1F8A955D5046D5B96191CAC7569DFEC0D83"
                        }
                     ],
                     "certificateTransparencyCompliance":"compliant"
                  },
                  "initiator":"",
                  "initiator_line":"",
                  "initiator_column":"",
                  "initiator_type":"script",
                  "priority":"HIGHEST",
                  "initial_priority":"VeryHigh",
                  "server_rtt":null,
                  "headers":{
                     "request":[
                        ":method: GET",
                        ":authority: docs.webpagetest.org",
                        ":scheme: https",
                        ":path: /",
                        "upgrade-insecure-requests: 1",
                        "user-agent: Mozilla/5.0 (Linux; Android 6.0.1; Moto G (4)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Mobile Safari/537.36 PTST/210419.211328",
                        "accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
                        "sec-fetch-site: cross-site",
                        "sec-fetch-mode: navigate",
                        "sec-fetch-dest: document",
                        "accept-encoding: gzip, deflate, br",
                        "accept-language: en-US,en;q=0.9"
                     ],
                     "response":[
                        "content-type: text/html; charset=UTF-8",
                        "date: Tue, 27 Apr 2021 11:58:35 GMT",
                        "etag: "50dfb5ef4ccf18da5e07c09a798f25c4-ssl-df"",
                        "strict-transport-security: max-age=31536000",
                        "x-content-type-options: nosniff",
                        "x-frame-options: SAMEORIGIN",
                        "x-xss-protection: 1; mode=block",
                        "content-encoding: br",
                        "content-length: 5465",
                        "age: 5842",
                        "server: Netlify",
                        "vary: Accept-Encoding",
                        "cache-control: max-age=900,must-revalidate",
                        "x-nf-request-id: c2eaf3a4-2a5a-4666-ab88-50a4385ecc91-7870268",
                        ":status: 200"
                     ]
                  },
                  "bytesOut":1741,
                  "score_cache":-1,
                  "score_cdn":100,
                  "score_gzip":100,
                  "score_cookies":-1,
                  "score_keep-alive":100,
                  "score_minify":-1,
                  "score_combine":-1,
                  "score_compress":-1,
                  "score_etags":-1,
                  "dns_ms":178,
                  "connect_ms":171,
                  "ssl_ms":203,
                  "gzip_total":5465,
                  "gzip_save":0,
                  "minify_total":null,
                  "minify_save":null,
                  "image_total":null,
                  "image_save":null,
                  "cache_time":null,
                  "cdn_provider":"Netlify",
                  "server_count":null,
                  "created":4,
                  "http2_stream_id":1,
                  "http2_stream_dependency":0,
                  "http2_stream_weight":256,
                  "http2_stream_exclusive":1,
                  "http2_server_settings":{
                     "SETTINGS_MAX_CONCURRENT_STREAMS":150,
                     "SETTINGS_MAX_HEADER_LIST_SIZE":131072
                  },
                  "tls_version":"TLS 1.3",
                  "tls_resumed":"False",
                  "tls_next_proto":"h2",
                  "tls_cipher_suite":4866,
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                        "-----BEGIN CERTIFICATE-----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n-----END CERTIFICATE-----n"
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                     "number":12
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               "connections":5,
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               "osVersion":"Linux 5.4.0-1045-aws",
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               "osPlatform":"x86_64 x86_64",
               "date":1619530556.95751,
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               "browser_version":"90.0.4430.85",
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               "detected_apps":{
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               },
               "base_page_ip_ptr":"ec2-52-203-36-44.compute-1.amazonaws.com",
               "base_page_cname":"",
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                        "name":"HasMarkerPseudoElement",
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                     "512":{
                        "name":"CSSPropertyGridRowGap",
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                     },
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                        "name":"CSSPropertyVariable",
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                     "534":{
                        "name":"CSSPropertyHyphens",
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                     },
                     "592":{
                        "name":"CSSPropertyGap",
                        "firstUsed":803.963
                     }
                  },
                  "AnimatedCSSFeatures":[
                     
                  ]
               },
               "maxFID":0,
               "TTIMeasurementEnd":3458,
               "LastInteractive":900,
               "TotalBlockingTime":0,
               "step":1,
               "effectiveBps":35446,
               "effectiveBpsDoc":86349,
               "domTime":0,
               "aft":0,
               "titleTime":0,
               "domLoading":0,
               "server_rtt":0,
               "smallImageCount":4,
               "bigImageCount":0,
               "maybeCaptcha":0,
               "testID":"210427_AiDcXW_8bd098a817944af61f7db97e4463e622",
               "pages":{
                  "details":"https://www.webpagetest.org/details.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&run=1",
                  "checklist":"https://www.webpagetest.org/performance_optimization.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&run=1",
                  "breakdown":"https://www.webpagetest.org/breakdown.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&run=1",
                  "domains":"https://www.webpagetest.org/domains.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&run=1",
                  "screenShot":"https://www.webpagetest.org/screen_shot.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&run=1"
               },
               "thumbnails":{
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                  "checklist":"https://www.webpagetest.org/result/210427_AiDcXW_8bd098a817944af61f7db97e4463e622/1_optimization_thumb.png",
                  "screenShot":"https://www.webpagetest.org/result/210427_AiDcXW_8bd098a817944af61f7db97e4463e622/1_screen_thumb.png"
               },
               "images":{
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                  "connectionView":"https://www.webpagetest.org/results/21/04/27/AiDcXW/8bd098a817944af61f7db97e4463e622/1_connection.png",
                  "checklist":"https://www.webpagetest.org/results/21/04/27/AiDcXW/8bd098a817944af61f7db97e4463e622/1_optimization.png",
                  "screenShot":"https://www.webpagetest.org/getfile.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&file=1_screen.jpg"
               },
               "rawData":{
                  "scriptTiming":"https://www.webpagetest.org/getgzip.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&file=1_script_timing.json",
                  "headers":"https://www.webpagetest.org/results/21/04/27/AiDcXW/8bd098a817944af61f7db97e4463e622/1_report.txt",
                  "pageData":"https://www.webpagetest.org/results/21/04/27/AiDcXW/8bd098a817944af61f7db97e4463e622/1_IEWPG.txt",
                  "requestsData":"https://www.webpagetest.org/results/21/04/27/AiDcXW/8bd098a817944af61f7db97e4463e622/1_IEWTR.txt",
                  "utilization":"https://www.webpagetest.org/results/21/04/27/AiDcXW/8bd098a817944af61f7db97e4463e622/1_progress.csv",
                  "trace":"https://www.webpagetest.org/getgzip.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&compressed=1&file=1_trace.json.gz"
               },
               "videoFrames":[
                  {
                     "time":0,
                     "image":"https://www.webpagetest.org/getfile.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&video=video_1&file=ms_000000.jpg",
                     "VisuallyComplete":0
                  },
                  {
                     "time":900,
                     "image":"https://www.webpagetest.org/getfile.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&video=video_1&file=ms_000900.jpg",
                     "VisuallyComplete":98
                  },
                  {
                     "time":1000,
                     "image":"https://www.webpagetest.org/getfile.php?test=210427_AiDcXW_8bd098a817944af61f7db97e4463e622&video=video_1&file=ms_001000.jpg",
                     "VisuallyComplete":100
                  }
               ],
               "domains":{
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                     "bytes":76903,
                     "requests":8,
                     "cdn_provider":"Netlify",
                     "connections":2
                  },
                  "www.google.com":{
                     "bytes":42,
                     "requests":1,
                     "cdn_provider":"Google",
                     "connections":1
                  },
                  "www.google-analytics.com":{
                     "bytes":19573,
                     "requests":2,
                     "cdn_provider":"Google",
                     "connections":1
                  },
                  "stats.g.doubleclick.net":{
                     "bytes":2,
                     "requests":1,
                     "cdn_provider":"Google",
                     "connections":1
                  }
               },
               "breakdown":{
                  "html":{
                     "color":[
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                     ],
                     "bytes":5465,
                     "bytesUncompressed":22360,
                     "requests":1
                  },
                  "js":{
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                     "bytes":19569,
                     "bytesUncompressed":49153,
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                  },
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                     "color":[
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                     "bytesUncompressed":0,
                     "requests":0
                  },
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                     ],
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               },
               "consoleLog":[
                  
               ]
            }
         }
      }
   },
   "statusCode":200,
   "statusText":"Test Complete",
   "webPagetestVersion":"20.06"
}

With the current promotional pricing, API access starts at $9.89/month (if you pay annually) which is 1,200 tests per month. That would be 40 tests a day, which is a great starting point for most actively developed projects. There is pricing that scales up to 25,000 tests a month for $131.99/month. And if you need even more than that, you can talk to them and they’ll get you sorted—they have scaling-friendly pricing, making it more affordable than other SaaS performance testing tools.

So with API access, what can you do? Well, that’s the point of an API: you can do whatever you want. An obvious choice is building performance dashboards for your company. Building them yourself means you can focus on exactly the tracking and reporting that matters most to your company. Not to mention that you can store the data internally, build the UIs internally, and generally keep everything in-house like so many companies like to do.

Here’s another idea. You could build alerting tools. Here’s a Node wrapper for the API. It supports JSON Test Specs. You set up your performance tests to run and your performance metrics you want to hit, and get results like:

I’m sure you can imagine shooting results like that to a Slack channel, an email, a SMS message, etc.

Alerting people to performance problems is some big girl pants stuff that way more companies should be doing.

Just so you know, while you get data back from the API and it’s likely you’ll store it yourself, that data is also stored on WebPageTest for 13 months. So as long as you know the test ID, you can get it again, not to mention use the WebPageTest UI for looking at the data without having to build your own dashboard.

There is a GitHub Action for the WebPageTest API. So with very little setup, you can have your PRs have a bunch of performance information. Super cool.

I know everyone is so hot on Core Web Vitals right now. Look at that. All three of them sitting right there in the Pull Request.

This can be a part of a cultural change toward a more performance focused development team at a company.

Just to put a point on it, one of the strengths of WebPageTest is that it reports from literally real browsers, and not just Chrome. Lighthouse is a nice performance tool too, but it’s Chrome-only. So is doing your own browser controlling with a tool like Puppeteer. WebPageTest supports Chrome, and Firefox, Edge, and even Brave. It reports way more performance metrics, and does it from physical locations all around the world.

I’m a big believer that the most important analytics, performance or otherwise, are metrics that you decide upon yourselves as a company, because they reflect some clear value. Maybe you’re trying to fix a problem and you can only fix what you measure. Maybe you know that you sell more widgets when page speed stays high. Maybe you you need to keep an eye on particular contractors who have a habit of not optimizing images.

With the amount of detailed data you get from the WebPageTest API, you can track just about anything you can dream of. And you don’t have to rely on only what WebPageTest does by default. You can script WebPageTest to run code on your site. Say you need to perform special steps before testing, you can. Even cooler, you can report custom metrics, which are then added to the API data. Say you wanted to know how many <svg> elements were on the page, test if a captcha loaded, or check if any elements had duplicate IDs. You script it up and use the custom metrics for that.

WebPageTest also supports the standard Custom Marks / Custom Timing stuff. So for example performance.mark('playback-start'); will report that timing when you run that anywhere in your JavaScript. Or you could do <button elementtiming="buy-now-button">Buy Now</button> to register when that element first paints and get that data. Those kind of custom metrics are pretty damn important because they reflect your site’s most important functionality.



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