Utilizza l'API PageSpeed Insights per:
- Misura il rendimento di una pagina web.
- Ricevi suggerimenti su come migliorare il rendimento, l'accessibilità e la SEO della pagina.
L'API PageSpeed Insights restituisce dati reali del Report sull'esperienza utente di Chrome e dati di laboratorio di Lighthouse.
API Explorer
Per effettuare chiamate all'API PageSpeed Insights senza scrivere codice, dai un'occhiata a Explorer API.
Acquisizione e utilizzo di una chiave API
In alternativa, creane uno nella pagina Credenziali.
Una volta ottenuta una chiave API, la tua applicazione può aggiungere il parametro di querykey=yourAPIKey
a tutti gli URL di richiesta.
La chiave API è sicura per l'inserimento negli URL e non richiede alcuna codifica.
curl
Per provare l'API PageSpeed Insights dalla riga di comando:
- Apri un terminale.
-
Esegui questo comando. Sostituisci
yourAPIKey
con la tua chiave API.curl https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=https://web.dev/&key=yourAPIKey
La risposta è un oggetto JSON. Consulta Risposta per saperne di più su ciascuna proprietà dell'oggetto risposta.
{ "captchaResult": "CAPTCHA_NOT_NEEDED", "kind": "pagespeedonline#result", "id": "https://developers.google.com/", "loadingExperience": { "id": "https://developers.google.com/", "metrics": { "FIRST_CONTENTFUL_PAINT_MS": { "percentile": 3482, "distributions": [ { "min": 0, "max": 1000, "proportion": 0.37151728768042963 }, { "min": 1000, "max": 2500, "proportion": 0.4244153519077991 }, { "min": 2500, "proportion": 0.2040673604117713 } ], "category": "SLOW" }, "FIRST_INPUT_DELAY_MS": { "percentile": 36, "distributions": [ { "min": 0, "max": 50, "proportion": 0.960628961482204 }, { "min": 50, "max": 250, "proportion": 0.02888834714773281 }, { "min": 250, "proportion": 0.010482691370063388 } ], "category": "FAST" } }, "overall_category": "SLOW", "initial_url": "https://developers.google.com/" }, "originLoadingExperience": { "id": "https://developers.google.com", "metrics": { "FIRST_CONTENTFUL_PAINT_MS": { "percentile": 2761, "distributions": [ { "min": 0, "max": 1000, "proportion": 0.4236433226493666 }, { "min": 1000, "max": 2500, "proportion": 0.45045120795679117 }, { "min": 2500, "proportion": 0.1259054693938423 } ], "category": "SLOW" }, "FIRST_INPUT_DELAY_MS": { "percentile": 45, "distributions": [ { "min": 0, "max": 50, "proportion": 0.9537371485251699 }, { "min": 50, "max": 250, "proportion": 0.03044972719889055 }, { "min": 250, "proportion": 0.01581312427593959 } ], "category": "FAST" } }, "overall_category": "SLOW", "initial_url": "https://developers.google.com/" }, "lighthouseResult": { "requestedUrl": "https://developers.google.com/", "finalUrl": "https://developers.google.com/", "lighthouseVersion": "3.2.0", "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/72.0.3584.0 Safari/537.36", "fetchTime": "2018-11-01T03:03:58.394Z", "environment": { "networkUserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3559.0 Safari/537.36", "hostUserAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/72.0.3584.0 Safari/537.36", "benchmarkIndex": 590.0 }, "runWarnings": [], "configSettings": { "emulatedFormFactor": "desktop", "locale": "en-US", "onlyCategories": [ "performance" ] }, "audits": { "estimated-input-latency": { "id": "estimated-input-latency", "title": "Estimated Input Latency", "description": "The score above is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/estimated-input-latency).", "score": 1.0, "scoreDisplayMode": "numeric", "displayValue": "30 ms" }, "uses-rel-preconnect": { "id": "uses-rel-preconnect", "title": "Preconnect to required origins", "description": "Consider adding preconnect or dns-prefetch resource hints to establish early connections to important third-party origins. [Learn more](https://developers.google.com/web/fundamentals/performance/resource-prioritization#preconnect).", "score": 1.0, "scoreDisplayMode": "numeric", "details": { "headings": [], "type": "opportunity", "items": [], "overallSavingsMs": 0.0 } }, ... }, "categories": { "performance": { "id": "performance", "title": "Performance", "score": 0.96, "auditRefs": [ { "id": "first-contentful-paint", "weight": 3.0, "group": "metrics" }, { "id": "first-meaningful-paint", "weight": 1.0, "group": "metrics" }, ... ] } }, "categoryGroups": { "a11y-element-names": { "title": "Elements Have Discernible Names", "description": "These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader." }, "a11y-language": { "title": "Page Specifies Valid Language", "description": "These are opportunities to improve the interpretation of your content by users in different locales." }, ... }, "i18n": { "rendererFormattedStrings": { "varianceDisclaimer": "Values are estimated and may vary.", "opportunityResourceColumnLabel": "Opportunity", "opportunitySavingsColumnLabel": "Estimated Savings", "errorMissingAuditInfo": "Report error: no audit information", "errorLabel": "Error!", "warningHeader": "Warnings: ", "auditGroupExpandTooltip": "Show audits", "passedAuditsGroupTitle": "Passed audits", "notApplicableAuditsGroupTitle": "Not applicable", "manualAuditsGroupTitle": "Additional items to manually check", "toplevelWarningsMessage": "There were issues affecting this run of Lighthouse:", "scorescaleLabel": "Score scale:", "crcLongestDurationLabel": "Maximum critical path latency:", "crcInitialNavigation": "Initial Navigation", "lsPerformanceCategoryDescription": "[Lighthouse](https://developers.google.com/web/tools/lighthouse/) analysis of the current page on an emulated mobile network. Values are estimated and may vary.", "labDataTitle": "Lab Data" } } }, "analysisUTCTimestamp": "2018-11-01T03:03:58.394Z" }
JavaScript
Per provare l'API PageSpeed Insights da JavaScript:
-
Copia il codice di seguito. Il codice utilizza l'API PageSpeed Insights per misurare il rendimento di
https://web.dev/
e poi mostra i risultati./** * Fetches and displays PageSpeed Insights data. */ async function run() { const apiEndpoint = 'https://www.googleapis.com/pagespeedonline/v5/runPagespeed'; const targetUrl = 'https://web.dev/'; const url = new URL(apiEndpoint); url.searchParams.set('url', targetUrl); try { const response = await fetch(url); if (!response.ok) { throw new Error(`HTTP error! status: ${response.status}`); } const json = await response.json(); // See // https://developers.google.com/speed/docs/insights/v5/reference/pagespeedapi/runpagespeed#response // to learn more about each of the properties in the response object. showInitialContent(json.id); const cruxMetrics = { 'First Contentful Paint': json.loadingExperience.metrics.FIRST_CONTENTFUL_PAINT_MS?.category, 'Interaction to Next Paint': json.loadingExperience.metrics.INTERACTION_TO_NEXT_PAINT?.category, }; showCruxContent(cruxMetrics); const lighthouse = json.lighthouseResult; const lighthouseMetrics = { 'First Contentful Paint': lighthouse.audits['first-contentful-paint']?.displayValue, 'Speed Index': lighthouse.audits['speed-index']?.displayValue, 'Largest Contentful Paint': lighthouse.audits['largest-contentful-paint']?.displayValue, 'Total Blocking Time': lighthouse.audits['total-blocking-time']?.displayValue, 'Time To Interactive': lighthouse.audits['interactive']?.displayValue, }; showLighthouseContent(lighthouseMetrics); } catch (error) { console.error('Fetching PageSpeed Insights failed:', error); document.body.textContent = `Failed to fetch PageSpeed data. Check the console for errors.`; } } /** * Displays initial content, including the page ID. * @param {string} id The ID of the page being tested. */ function showInitialContent(id) { document.body.innerHTML = ''; // Clear previous content const title = document.createElement('h1'); title.textContent = 'PageSpeed Insights API Demo'; document.body.appendChild(title); const page = document.createElement('p'); page.textContent = `Page tested: ${id}`; document.body.appendChild(page); } /** * Displays CrUX metrics. * @param {!Object} cruxMetrics The CrUX metrics to display. */ function showCruxContent(cruxMetrics) { const cruxHeader = document.createElement('h2'); cruxHeader.textContent = 'Chrome User Experience Report Results'; document.body.appendChild(cruxHeader); for (const key in cruxMetrics) { const p = document.createElement('p'); p.textContent = `${key}: ${cruxMetrics[key]}`; document.body.appendChild(p); } } /** * Displays Lighthouse metrics. * @param {!Object} lighthouseMetrics The Lighthouse metrics to display. */ function showLighthouseContent(lighthouseMetrics) { const lighthouseHeader = document.createElement('h2'); lighthouseHeader.textContent = 'Lighthouse Results'; document.body.appendChild(lighthouseHeader); for (const key in lighthouseMetrics) { const p = document.createElement('p'); p.textContent = `${key}: ${lighthouseMetrics[key]}`; document.body.appendChild(p); } } run();
- Incolla il codice in un tag
script
in un file HTML. -
Apri il file HTML in un browser. Al termine dell'operazione, la pagina avrà il seguente aspetto: Figura 1.
Figura 1. La demo JavaScript
Passaggi successivi
- Consulta Risposta per scoprire di più su ciascuna proprietà nell'oggetto risposta.
- Per scoprire di più sulla modalità di calcolo delle misurazioni del rendimento, consulta Informazioni sull'API PageSpeed Insights.
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