Seeking lists (in array form) of latitude, longitudes for streets and other places?

Question

I am trying to get an array of latitude and longitudes so that I can test line making on an app. My issue though is finding lists (in form of array) of latitude and longitude. This is an example of what I am looking for:

[ [ 37.33523566, -122.03254863], [ 37.33521504, -122.03254905 ], [ 37.33519572, -122.0325498 ], [ 37.33517518, -122.03255055 ], [ 37.33515083, -122.03255349 ], [ 37.3351212, -122.03256229 ], [ 37.33507162, -122.0326037 ], [ 37.33503868, -122.03265072 ], [ 37.33500926, -122.03272188 ], [ 37.33497737, -122.03281282 ], [ 37.33494812, -122.0329212 ], [ 37.33492222, -122.03304215 ], [ 37.33489242, -122.03318372 ], [ 37.33485843, -122.03334424 ], [ 37.33482105, -122.03350886 ], [ 37.33477977, -122.03369603 ], [ 37.33474691, -122.03389325 ], [ 37.33470894, -122.03411085 ], [ 37.33467638, -122.03432425 ], [ 37.33464561, -122.03455442 ], [ 37.33461946, -122.03478727 ], [ 37.33460316, -122.0350347 ], [ 37.33458564, -122.03529395 ], [ 37.3345628, -122.03556217 ], [ 37.3345597, -122.03583308 ], [ 37.33454847, -122.03611286 ], [ 37.33454218, -122.03638578 ], [ 37.33454235, -122.03666775 ], [ 37.33453849, -122.03695223 ], [ 37.33453874, -122.03724626 ], [ 37.33453652, -122.03753997 ], [ 37.33452613, -122.03783266 ], [ 37.33451917, -122.03813827 ], [ 37.33451284, -122.03845141 ], [ 37.33450379, -122.03875937 ], [ 37.33449629, -122.03908048 ], [ 37.33448791, -122.03941089 ], [ 37.33447622, -122.0397398 ], [ 37.33447068, -122.04007348 ], [ 37.33446519, -122.04041597 ], [ 37.3344584, -122.04077831 ], [ 37.33445283, -122.04113765 ], [ 37.3344499, -122.04149924 ], [ 37.33444604, -122.04187567 ], [ 37.33444843, -122.04226334 ], [ 37.33444952, -122.04265083 ], [ 37.33445363, -122.04302852 ], [ 37.33445945, -122.04342255 ], [ 37.33446146, -122.04380955 ], [ 37.33445832, -122.04420408 ], [ 37.33445442, -122.04458579 ], [ 37.33444763, -122.04496063 ], [ 37.33444244, -122.045341 ], [ 37.33443657, -122.04571727 ], [ 37.33441708, -122.04607568 ], [ 37.3343947, -122.04644121 ], [ 37.33436235, -122.04681002 ], [ 37.33431797, -122.04716524 ], [ 37.33426985, -122.04751058 ], [ 37.33420971, -122.04784191 ], [ 37.33414287, -122.04818683 ], [ 37.33406324, -122.04853007 ], [ 37.33398776, -122.04886543 ], [ 37.33390604, -122.04921638 ], [ 37.3338288, -122.04956959 ], [ 37.33375445, -122.04992666 ], [ 37.33367998, -122.05028306 ], [ 37.33360693, -122.05063996 ], [ 37.33352458, -122.05100549 ], [ 37.33344889, -122.05137547 ], [ 37.33336511, -122.05174034 ], [ 37.33328787, -122.05209673 ], [ 37.33321101, -122.05246948 ], [ 37.33313411, -122.05283635 ], [ 37.33305632, -122.05318781 ], [ 37.33298105, -122.0535463 ], [ 37.33290406, -122.05391527 ], [ 37.33282486, -122.05427997 ], [ 37.33275353, -122.05462472 ], [ 37.33268517, -122.05498531 ], [ 37.33260475, -122.05535361 ], [ 37.33252881, -122.05571688 ], [ 37.33245639, -122.05608208 ], [ 37.33238246, -122.05644652 ], [ 37.33236209, -122.05682698 ], [ 37.33232211, -122.05719234 ], [ 37.33229772, -122.05757204 ], [ 37.332289, -122.05795133 ], [ 37.33228724, -122.05833354 ], [ 37.33230505, -122.05871525 ], [ 37.33233606, -122.05909629 ], [ 37.33238246, -122.0594718 ], [ 37.33244004, -122.05984991 ], [ 37.33251376, -122.06021989 ], [ 37.33260198, -122.06059221 ], [ 37.33270432, -122.06095339 ], [ 37.33282574, -122.06131389 ], [ 37.3329513, -122.06167465 ], [ 37.33307736, -122.06203541 ], [ 37.33320782, -122.06239181 ], [ 37.33333498, -122.06274686 ], [ 37.33346293, -122.06310662 ], [ 37.33358639, -122.06346075 ], [ 37.33370957, -122.06381723 ], [ 37.33383844, -122.06417204 ], [ 37.33395407, -122.06452986 ], [ 37.33405917, -122.06489607 ], [ 37.33414928, -122.06526437 ], [ 37.33422447, -122.06562781 ], [ 37.33429383, -122.06600055 ], [ 37.33435409, -122.06636961 ], [ 37.33440019, -122.06674461 ], [ 37.33442928, -122.06711736 ], [ 37.3344465, -122.06749672 ], [ 37.3344543, -122.06787986 ], [ 37.33444654, -122.06826065 ], [ 37.33442613, -122.06864035 ], [ 37.33439537, -122.06901468 ], [ 37.33435661, -122.06939204 ], [ 37.33430397, -122.06976336 ], [ 37.33424182, -122.07013275 ], [ 37.33417438, -122.07050306 ], [ 37.33410968, -122.07087404 ], [ 37.33403923, -122.07123245 ], [ 37.33396475, -122.07160897 ], [ 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37.34208941, -122.09195687 ], [ 37.34229154, -122.092223 ], [ 37.3424959, -122.09246482 ], [ 37.342708, -122.092712 ], [ 37.34291352, -122.09295692 ], [ 37.34312416, -122.09320284 ], [ 37.34332805, -122.09343444 ], [ 37.34353735, -122.09368045 ], [ 37.34374576, -122.09392 ], [ 37.34394974, -122.09415478 ], [ 37.34415677, -122.09439031 ], [ 37.34434595, -122.09463741 ], [ 37.34453978, -122.09489641 ], [ 37.34472464, -122.09516438 ], [ 37.3448932, -122.0954383 ], [ 37.34505141, -122.09572596 ], [ 37.34520782, -122.0960117 ], [ 37.34534964, -122.09631924 ], [ 37.34548953, -122.096638 ], [ 37.34562364, -122.09695274 ], [ 37.34576798, -122.09727888 ], [ 37.34590884, -122.09760787 ], [ 37.34604924, -122.0979434 ], [ 37.34619047, -122.09828781 ], [ 37.34633112, -122.09862728 ], [ 37.3464786, -122.09896549 ], [ 37.3466164, -122.09929791 ], [ 37.34676434, -122.09963352 ], [ 37.34690805, -122.09997509 ], [ 37.34705171, -122.10032243 ], [ 37.34719244, -122.1006624 ], [ 37.34733473, -122.10099349 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37.38875059, -122.15884924 ], [ 37.38880101, -122.1592167 ], [ 37.38885423, -122.15958014 ], [ 37.38890729, -122.15994434 ], [ 37.38896215, -122.16030945 ], [ 37.38901726, -122.16067063 ] ]

I have tried using onthegomap.com but they export only in GPX and I have been unable to convert it to something like above.

Are there any databases for this or any websites that may facilitate this?

Answer 1

(From comment)

(if I understood correctly,) any geojson will be close enough to the format you are looking for. For example:

https://raw.githubusercontent.com/datasets/geo-countries/master/data/countries.geojson

Answer 2

I'm not sure where you are but for the UK you can download postcode to lat/long tables from a variety of sources.

UK postcodes to lat/long - this site also has a variety of other countries.

You then seem to be asking how to convert a csv into a list. Obviously for an app you don't want to have to load the csv every time as its a fairly expensive operation so you want to run it once and remember the result. This is an app programming question, however, rather than a question of where to source data.