A tiny CrUX API wrapper that supports record & history API, handles errors, and provides types.
Motivation: CrUX API is a fantastic tool to get RUM data without installing any script.
While using the API in Treo, we discovered a few complex cases like API errors, rate limits, not found entries, URLs normalization, and TypeScript notations. We decided to build the crux-api library to make working with the CrUX API easier.
Features:
- A tiny (500 bytes) wrapper for Chrome UX Report API;
- Supports both the record and history API;
- TypeScript notations for options and responses;
- Isomorphic: works in a browser and node.js;
- Returns
nullfor the404 (CrUX data not found)response; - Automatic retry when hits the API rate limits:
429 (Quota exceeded); - URL normalization helper to check the CrUX API index;
Install:
npm install crux-apiFetch URL-level data for a various form factors and connections:
import { createQueryRecord } from 'crux-api'
const queryRecord = createQueryRecord({ key: CRUX_API_KEY })
// fetch all dimensions
const jsonRecord = await queryRecord({ url: 'https://github.com/marketplace?type=actions', formFactor: 'DESKTOP' })The jsonRecord is null or an object with queryRecord response body, ex:
{
"record": {
"key": { "formFactor": "DESKTOP", "url": "https://github.com/marketplace" },
"metrics": {
"largest_contentful_paint_image_time_to_first_byte": { "percentiles": { "p75": 838 } },
"largest_contentful_paint_resource_type": { "fractions": { "text": 0.3544, "image": 0.6456 } },
"first_contentful_paint": {
"histogram": [
{ "start": 0, "end": 1800, "density": 0.9194 },
{ "start": 1800, "end": 3000, "density": 0.0576 },
{ "start": 3000, "density": 0.023 }
],
"percentiles": { "p75": 1208 }
},
"largest_contentful_paint_image_resource_load_delay": { "percentiles": { "p75": 176 } },
"navigation_types": {
"fractions": {
"back_forward_cache": 0.0398,
"prerender": 0.0089,
"navigate": 0.7618,
"navigate_cache": 0,
"reload": 0.0104,
"restore": 0.0079,
"back_forward": 0.1712
}
},
"round_trip_time": {
"histogram": [
{ "start": 0, "end": 75, "density": 0.4881 },
{ "start": 75, "end": 275, "density": 0.4041 },
{ "start": 275, "density": 0.1078 }
],
"percentiles": { "p75": 153 }
},
"cumulative_layout_shift": {
"histogram": [
{ "start": "0.00", "end": "0.10", "density": 0.9343 },
{ "start": "0.10", "end": "0.25", "density": 0.0511 },
{ "start": "0.25", "density": 0.0146 }
],
"percentiles": { "p75": "0.01" }
},
"experimental_time_to_first_byte": {
"histogram": [
{ "start": 0, "end": 800, "density": 0.6801 },
{ "start": 800, "end": 1800, "density": 0.2999 },
{ "start": 1800, "density": 0.02 }
],
"percentiles": { "p75": 846 }
},
"interaction_to_next_paint": {
"histogram": [
{ "start": 0, "end": 200, "density": 0.9682 },
{ "start": 200, "end": 500, "density": 0.023 },
{ "start": 500, "density": 0.0088 }
],
"percentiles": { "p75": 63 }
},
"largest_contentful_paint": {
"histogram": [
{ "start": 0, "end": 2500, "density": 0.9343 },
{ "start": 2500, "end": 4000, "density": 0.0418 },
{ "start": 4000, "density": 0.0239 }
],
"percentiles": { "p75": 1450 }
},
"largest_contentful_paint_image_element_render_delay": { "percentiles": { "p75": 146 } },
"largest_contentful_paint_image_resource_load_duration": { "percentiles": { "p75": 362 } }
},
"collectionPeriod": {
"firstDate": { "year": 2026, "month": 1, "day": 11 },
"lastDate": { "year": 2026, "month": 2, "day": 7 }
}
},
"urlNormalizationDetails": {
"originalUrl": "https://github.com/marketplace?type=actions",
"normalizedUrl": "https://github.com/marketplace"
}
}Fetch historic data for a URL:
import { createQueryHistoryRecord } from 'crux-api'
const queryHistoryRecord = createQueryHistoryRecord({ key: CRUX_API_KEY })
const jsonHistory = await queryHistoryRecord({ url: 'https://github.com/' }) // fetch ALL_FORM_FACTORSThe jsonHistory is null or an object with queryHistoryRecord response body, ex:
{
"record": {
"key": {
"url": "https://github.com/"
},
"metrics": {
"cumulative_layout_shift": {
"histogramTimeseries": [
{
"start": "0.00",
"end": "0.10",
"densities": [0.936, 0.9367, 0.9352, ...]
},
{
"start": "0.10",
"end": "0.25",
"densities": [0.0599, 0.0593, 0.0609, ...]
},
{
"start": "0.25",
"densities": [0.0041, 0.0041, 0.0039, ...]
},
{ ... }
],
"percentilesTimeseries": {
"p75s": ["0.05", "0.05", ...]
}
},
"experimental_time_to_first_byte": { ... },
"first_contentful_paint": { ... },
"largest_contentful_paint_image_element_render_delay": { ... },
"largest_contentful_paint_resource_type": { ... },
"navigation_types": { ... },
"round_trip_time": { ... },
"form_factors": { ... },
"interaction_to_next_paint": { ... },
"largest_contentful_paint": { ... },
"largest_contentful_paint_image_resource_load_delay": { ... },
"largest_contentful_paint_image_resource_load_duration": { ... },
"largest_contentful_paint_image_time_to_first_byte": { ... },
},
"collectionPeriods": [
{
"firstDate": { "year": 2025, "month": 7, "day": 27 },
"lastDate": { "year": 2025, "month": 8, "day": 23 }
},
{ ... }
]
}
}Returns a queryRecord function.
- createOptions.key (required) - CrUX API key, use https://goo.gle/crux-api-key to generate a new key;
- createOptions.fetch (optional, default:
window.fetch) - pass a WHATWG fetch implementation for a non-browser environment;
Fetches CrUX API using queryRecord options:
- queryOptions.url or queryOptions.origin (required) – the main identifier for a record lookup;
- queryOptions.formFactor (optional, defaults to all form factors) - the form factor dimension:
PHONE|DESKTOP|TABLET. - queryOptions.collectionPeriodCount (optional, default is 25) - the number of collection periods to return between 1 and 40
Returns a Promise with a raw queryRecord response or null when the data is not found.
import { createQueryRecord } from 'crux-api'
const queryRecord = createQueryRecord({ key: process.env.CRUX_API_KEY })
const res = await queryRecord({
url: 'https://github.com/marketplace?type=actions',
formFactor: 'DESKTOP',
})
// res -> URL-level data for https://github.com/marketplaceReturns a function that fetches [CrUX History API using queryHistoryRecord options:
import { createQueryHistoryRecord } from 'crux-api'
const queryHistory = createQueryHistoryRecord({ key: process.env.CRUX_API_KEY })
const res = await queryHistory({ url: 'https://www.github.com/' })Normalize a URL to match the CrUX API internal index.
It is a URL's origin + pathname (source).
import { normalizeUrl } from 'crux-api'
console.log(normalizeUrl('https://github.com/marketplace?type=actions')) // https://github.com/marketplace (removes search params)
console.log(normalizeUrl('https://github.com')) // https://github.com/ (adds "/" to the end)The crux-api is designed to return data and automatically handles errors. It returns an object for 200 responses, retries after 429, and returns null for 404.
For 400 and 5xx it throws a relevant error.
Below are all known responses of Chrome UX Report API for easier debugging and development (The API documentation is vague about errors, please, submit an issue, if you know other responses).
âś… 200: URL-level CrUX History API data
curl -d url='https://github.com/' \
-d formFactor=DESKTOP \
'https://chromeuxreport.googleapis.com/v1/records:queryHistoryRecord?key=CRUX_API_KEY'{
"record": {
"key": { "formFactor": "DESKTOP", "url": "https://github.com/" },
"metrics": {
"cumulative_layout_shift": {
"histogramTimeseries": [
{
"start": "0.00",
"end": "0.10",
"densities": [
0.9451, 0.9459, 0.9458, 0.9435, 0.9439, 0.9483, 0.9478, 0.9486, 0.9472, 0.9455, 0.9383, 0.9262, 0.8933,
0.856, 0.8275, 0.8092, 0.8117, 0.8178, 0.8232, 0.8265, 0.8278, 0.8336, 0.8417, 0.8511, 0.8577
]
},
{
"start": "0.10",
"end": "0.25",
"densities": [
0.0515, 0.0508, 0.051, 0.0529, 0.0524, 0.0485, 0.0491, 0.048, 0.0497, 0.0509, 0.0574, 0.0683, 0.0989,
0.1345, 0.1613, 0.179, 0.1756, 0.1696, 0.1636, 0.1602, 0.159, 0.154, 0.1461, 0.1375, 0.1313
]
},
{
"start": "0.25",
"densities": [
0.0034, 0.0033, 0.0032, 0.0035, 0.0036, 0.0033, 0.0031, 0.0034, 0.0031, 0.0036, 0.0043, 0.0056, 0.0078,
0.0096, 0.0112, 0.0118, 0.0128, 0.0125, 0.0132, 0.0133, 0.0132, 0.0124, 0.0123, 0.0114, 0.011
]
}
],
"percentilesTimeseries": {
"p75s": [
"0.05",
"0.05",
"0.05",
"0.05",
"0.05",
"0.04",
"0.04",
"0.04",
"0.04",
"0.04",
"0.05",
"0.06",
"0.07",
"0.08",
"0.08",
"0.09",
"0.08",
"0.08",
"0.08",
"0.08",
"0.08",
"0.08",
"0.08",
"0.08",
"0.08"
]
}
},
"first_contentful_paint": {
"histogramTimeseries": [
{
"start": 0,
"end": 1800,
"densities": [
0.8693, 0.8688, 0.8704, 0.8652, 0.866, 0.8617, 0.8647, 0.8692, 0.8702, 0.8697, 0.8685, 0.8702, 0.8737,
0.8726, 0.8727, 0.8725, 0.8671, 0.8653, 0.863, 0.8622, 0.8642, 0.8659, 0.8648, 0.8599, 0.8552
]
},
{
"start": 1800,
"end": 3000,
"densities": [
0.0841, 0.0841, 0.0842, 0.087, 0.088, 0.0905, 0.0896, 0.0861, 0.085, 0.0853, 0.0853, 0.0837, 0.0823,
0.0815, 0.0818, 0.0818, 0.0852, 0.0866, 0.087, 0.087, 0.0865, 0.0857, 0.0873, 0.0895, 0.0924
]
},
{
"start": 3000,
"densities": [
0.0466, 0.0471, 0.0455, 0.0478, 0.046, 0.0479, 0.0457, 0.0448, 0.0448, 0.045, 0.0462, 0.0461, 0.044,
0.0459, 0.0455, 0.0457, 0.0477, 0.0481, 0.05, 0.0507, 0.0493, 0.0484, 0.0479, 0.0506, 0.0524
]
}
],
"percentilesTimeseries": {
"p75s": [
1340, 1341, 1342, 1360, 1364, 1366, 1359, 1337, 1328, 1324, 1325, 1324, 1315, 1310, 1306, 1297, 1313, 1327,
1335, 1341, 1329, 1328, 1337, 1352, 1380
]
}
},
"interaction_to_next_paint": {
"histogramTimeseries": [
{
"start": 0,
"end": 200,
"densities": [
0.9261, 0.9262, 0.929, 0.9341, 0.9369, 0.9378, 0.9415, 0.9408, 0.9414, 0.942, 0.9422, 0.9435, 0.9443,
0.9463, 0.9492, 0.9509, 0.9539, 0.9549, 0.955, 0.9561, 0.9565, 0.9561, 0.9565, 0.9532, 0.9504
]
},
{
"start": 200,
"end": 500,
"densities": [
0.0536, 0.0536, 0.0518, 0.0471, 0.045, 0.0427, 0.0392, 0.0398, 0.0389, 0.0384, 0.0392, 0.039, 0.0388,
0.0391, 0.0372, 0.0362, 0.0346, 0.0329, 0.0335, 0.0318, 0.032, 0.0321, 0.0314, 0.033, 0.0341
]
},
{
"start": 500,
"densities": [
0.0203, 0.0202, 0.0193, 0.0187, 0.0182, 0.0194, 0.0193, 0.0194, 0.0196, 0.0196, 0.0186, 0.0174, 0.0168,
0.0146, 0.0136, 0.0129, 0.0115, 0.0122, 0.0115, 0.0121, 0.0115, 0.0118, 0.0121, 0.0138, 0.0154
]
}
],
"percentilesTimeseries": {
"p75s": [79, 78, 78, 75, 71, 69, 67, 67, 67, 67, 67, 67, 67, 67, 66, 64, 63, 63, 62, 63, 63, 63, 62, 62, 62]
}
},
"largest_contentful_paint": {
"histogramTimeseries": [
{
"start": 0,
"end": 2500,
"densities": [
0.8137, 0.8162, 0.8207, 0.821, 0.8292, 0.8457, 0.8513, 0.8548, 0.8529, 0.8538, 0.8622, 0.8726, 0.8638,
0.8423, 0.8222, 0.8047, 0.8033, 0.7977, 0.7969, 0.7948, 0.7952, 0.7885, 0.784, 0.7786, 0.7738
]
},
{
"start": 2500,
"end": 4000,
"densities": [
0.1206, 0.1185, 0.1154, 0.1168, 0.1094, 0.0982, 0.0947, 0.09, 0.0931, 0.0924, 0.0854, 0.078, 0.0841,
0.0985, 0.1126, 0.1252, 0.1261, 0.1278, 0.1282, 0.1294, 0.129, 0.1317, 0.1368, 0.1391, 0.1435
]
},
{
"start": 4000,
"densities": [
0.0657, 0.0653, 0.0638, 0.0621, 0.0614, 0.0561, 0.054, 0.0552, 0.054, 0.0538, 0.0524, 0.0494, 0.0521,
0.0591, 0.0651, 0.0701, 0.0706, 0.0745, 0.0749, 0.0758, 0.0758, 0.0798, 0.0792, 0.0823, 0.0827
]
}
],
"percentilesTimeseries": {
"p75s": [
2172, 2157, 2134, 2137, 2075, 1964, 1931, 1893, 1915, 1910, 1842, 1766, 1825, 1967, 2095, 2201, 2218, 2234,
2245, 2257, 2253, 2282, 2317, 2338, 2380
]
}
},
"largest_contentful_paint_image_element_render_delay": {
"percentilesTimeseries": {
"p75s": [
331, 323, 313, 309, 273, 253, 251, 251, 258, 263, 258, 254, 256, 265, 280, 316, 320, 322, 320, 318, 335,
374, 385, 388, 389
]
}
},
"largest_contentful_paint_image_resource_load_delay": {
"percentilesTimeseries": {
"p75s": [
203, 189, 185, 182, 185, 187, 188, 188, 187, 178, 180, 185, 190, 207, 231, 328, 344, 357, 373, 392, 411,
583, 592, 430, 292
]
}
},
"largest_contentful_paint_image_resource_load_duration": {
"percentilesTimeseries": {
"p75s": [
139, 142, 144, 142, 173, 176, 176, 177, 171, 176, 188, 183, 179, 172, 151, 137, 139, 142, 145, 150, 151,
145, 142, 143, 146
]
}
},
"navigation_types": {
"fractionTimeseries": {
"back_forward_cache": {
"fractions": [
0.0074, 0.0067, 0.0065, 0.0066, 0.0067, 0.0086, 0.0095, 0.0113, 0.0121, 0.0101, 0.0091, 0.0069, 0.0061,
0.0062, 0.006, 0.0056, 0.0063, 0.0071, 0.0072, 0.0084, 0.0092, 0.0099, 0.0097, 0.0099, 0.0106
]
},
"prerender": {
"fractions": [
0.2518, 0.2512, 0.2497, 0.2488, 0.2483, 0.2486, 0.2509, 0.2532, 0.2552, 0.2575, 0.2571, 0.2577, 0.2581,
0.2585, 0.2584, 0.2597, 0.261, 0.2618, 0.2607, 0.2571, 0.2514, 0.2497, 0.2518, 0.2554, 0.2591
]
},
"navigate": {
"fractions": [
0.6292, 0.6319, 0.6335, 0.6335, 0.6342, 0.6339, 0.6315, 0.6307, 0.6292, 0.6288, 0.6294, 0.6311, 0.6302,
0.6305, 0.631, 0.6315, 0.6305, 0.6288, 0.6292, 0.6305, 0.6367, 0.6402, 0.6392, 0.6359, 0.6328
]
},
"navigate_cache": {
"fractions": [
0.0014, 0.0013, 0.0012, 0.0016, 0.0012, 0.0012, 0.0016, 0.0013, 0.0013, 0.0015, 0.0017, 0.0016, 0.0014,
0.0013, 0.0014, 0.0019, 0.0013, 0.0015, 0.0018, 0.0016, 0.0019, 0.0013, 0.0016, 0.0015, 0.0014
]
},
"reload": {
"fractions": [
0.017, 0.0165, 0.0169, 0.0168, 0.0169, 0.0167, 0.0169, 0.0164, 0.0166, 0.0166, 0.0164, 0.016, 0.0161,
0.0161, 0.016, 0.0155, 0.0159, 0.0164, 0.0166, 0.0171, 0.0164, 0.0164, 0.0165, 0.0164, 0.0165
]
},
"restore": {
"fractions": [
0.0043, 0.0038, 0.0044, 0.0045, 0.0046, 0.0042, 0.0045, 0.0042, 0.0042, 0.0044, 0.0045, 0.0039, 0.0046,
0.0042, 0.0045, 0.0042, 0.004, 0.0041, 0.0039, 0.0038, 0.0042, 0.0036, 0.0037, 0.0041, 0.004
]
},
"back_forward": {
"fractions": [
0.0888, 0.0885, 0.0878, 0.0881, 0.088, 0.0868, 0.085, 0.0829, 0.0813, 0.081, 0.0816, 0.0827, 0.0835,
0.0832, 0.0828, 0.0813, 0.081, 0.0802, 0.0804, 0.0814, 0.0802, 0.0789, 0.0774, 0.0767, 0.0756
]
}
}
},
"experimental_time_to_first_byte": {
"histogramTimeseries": [
{
"start": 0,
"end": 800,
"densities": [
0.6456, 0.6462, 0.6443, 0.6345, 0.6327, 0.6346, 0.6437, 0.6608, 0.6692, 0.6764, 0.6684, 0.6564, 0.6508,
0.6455, 0.6453, 0.6514, 0.6416, 0.6308, 0.6274, 0.6247, 0.6327, 0.6358, 0.6285, 0.6181, 0.5995
]
},
{
"start": 800,
"end": 1800,
"densities": [
0.3051, 0.3048, 0.3066, 0.3142, 0.3122, 0.3088, 0.2989, 0.2833, 0.2767, 0.2712, 0.2774, 0.2891, 0.2949,
0.2974, 0.2941, 0.2867, 0.2921, 0.3005, 0.3038, 0.305, 0.3, 0.2968, 0.304, 0.3119, 0.3298
]
},
{
"start": 1800,
"densities": [
0.0493, 0.049, 0.049, 0.0513, 0.0551, 0.0565, 0.0574, 0.0559, 0.0541, 0.0525, 0.0541, 0.0544, 0.0543,
0.057, 0.0606, 0.0619, 0.0663, 0.0687, 0.0688, 0.0703, 0.0673, 0.0674, 0.0675, 0.07, 0.0706
]
}
],
"percentilesTimeseries": {
"p75s": [
948, 948, 951, 965, 969, 972, 964, 941, 929, 919, 928, 944, 952, 958, 959, 952, 966, 979, 985, 989, 979,
973, 984, 997, 1022
]
}
},
"largest_contentful_paint_image_time_to_first_byte": {
"percentilesTimeseries": {
"p75s": [
1089, 1111, 1127, 1150, 1094, 1047, 1038, 1031, 1032, 1012, 1005, 1009, 1009, 1028, 1048, 1065, 1082, 1101,
1107, 1114, 1103, 1056, 1065, 1103, 1150
]
}
},
"largest_contentful_paint_resource_type": {
"fractionTimeseries": {
"image": {
"fractions": [
0.1295, 0.1312, 0.1352, 0.1377, 0.2061, 0.3335, 0.3686, 0.3699, 0.324, 0.3144, 0.3984, 0.5194, 0.5014,
0.3875, 0.2758, 0.1556, 0.1529, 0.1501, 0.1482, 0.1469, 0.1462, 0.1563, 0.1572, 0.1513, 0.1471
]
},
"text": {
"fractions": [
0.8705, 0.8687, 0.8648, 0.8623, 0.7939, 0.6664, 0.6314, 0.6301, 0.676, 0.6855, 0.6016, 0.4806, 0.4986,
0.6125, 0.7242, 0.8443, 0.8471, 0.8499, 0.8518, 0.853, 0.8538, 0.8437, 0.8428, 0.8486, 0.8529
]
}
}
},
"round_trip_time": {
"histogramTimeseries": [
{
"start": 0,
"end": 75,
"densities": [
0.472, 0.4757, 0.4798, 0.482, 0.4855, 0.4872, 0.4922, 0.4981, 0.5012, 0.5042, 0.5014, 0.4997, 0.4982,
0.4954, 0.4921, 0.4908, 0.4887, 0.4839, 0.4748, 0.4628, 0.4653, 0.4737, 0.4846, 0.4928, 0.496
]
},
{
"start": 75,
"end": 275,
"densities": [
0.4313, 0.4283, 0.4261, 0.4205, 0.4188, 0.4163, 0.4133, 0.4113, 0.4105, 0.4083, 0.4098, 0.4108, 0.411,
0.4119, 0.416, 0.4167, 0.417, 0.4211, 0.4276, 0.4354, 0.4348, 0.4299, 0.42, 0.414, 0.412
]
},
{
"start": 275,
"densities": [
0.0966, 0.096, 0.0941, 0.0975, 0.0957, 0.0965, 0.0946, 0.0905, 0.0883, 0.0875, 0.0888, 0.0895, 0.0908,
0.0927, 0.0919, 0.0925, 0.0943, 0.095, 0.0976, 0.1018, 0.0999, 0.0964, 0.0954, 0.0932, 0.092
]
}
],
"percentilesTimeseries": {
"p75s": [
152, 151, 150, 150, 150, 150, 147, 144, 143, 141, 143, 143, 144, 144, 145, 145, 146, 147, 150, 155, 154,
151, 147, 145, 144
]
}
}
},
"collectionPeriods": [
{ "firstDate": { "year": 2025, "month": 7, "day": 27 }, "lastDate": { "year": 2025, "month": 8, "day": 23 } },
{ "firstDate": { "year": 2025, "month": 8, "day": 3 }, "lastDate": { "year": 2025, "month": 8, "day": 30 } },
{ "firstDate": { "year": 2025, "month": 8, "day": 10 }, "lastDate": { "year": 2025, "month": 9, "day": 6 } },
{ "firstDate": { "year": 2025, "month": 8, "day": 17 }, "lastDate": { "year": 2025, "month": 9, "day": 13 } },
{ "firstDate": { "year": 2025, "month": 8, "day": 24 }, "lastDate": { "year": 2025, "month": 9, "day": 20 } },
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]
}
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