A tiny CrUX API wrapper that supports record & history API, handles errors, and provides types.
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:
null for the 404 (CrUX data not found) response;429 (Quota exceeded);Install:
npm install crux-api
Fetch 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_FACTORS
The 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.
window.fetch) - pass a WHATWG fetch implementation for a non-browser environment;Fetches CrUX API using queryRecord options:
PHONE | DESKTOP | TABLET.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/marketplace
Returns 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).
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 } },
{ "firstDate": { "year": 2025, "month": 8, "day": 31 }, "lastDate": { "year": 2025, "month": 9, "day": 27 } },
{ "firstDate": { "year": 2025, "month": 9, "day": 7 }, "lastDate": { "year": 2025, "month": 10, "day": 4 } },
{ "firstDate": { "year": 2025, "month": 9, "day": 14 }, "lastDate": { "year": 2025, "month": 10, "day": 11 } },
{ "firstDate": { "year": 2025, "month": 9, "day": 21 }, "lastDate": { "year": 2025, "month": 10, "day": 18 } },
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]
}
}
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FAQs
A tiny CrUX API wrapper that supports record & history API, handles errors, and provides types.
The npm package crux-api receives a total of 451 weekly downloads. As such, crux-api popularity was classified as not popular.
We found that crux-api demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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