Suppose the following JSON object was stored as string that I have also done a JSON.parse() on in javascript. (you do not really need to look at it before seeing the question at the bottom)

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{ "tracks" : { "href" : "https://api.spotify.com/v1/search?query=swalla&type=track&market=US&offset=0&limit=20", "items" : [ { "album" : { "album_type" : "single", "artists" : [ { "external_urls" : { "spotify" : "https://open.spotify.com/artist/07YZf4WDAMNwqr4jfgOZ8y" }, "href" : "https://api.spotify.com/v1/artists/07YZf4WDAMNwqr4jfgOZ8y", "id" : "07YZf4WDAMNwqr4jfgOZ8y", "name" : "Jason Derulo", "type" : "artist", "uri" : "spotify:artist:07YZf4WDAMNwqr4jfgOZ8y" }, { "external_urls" : { "spotify" : "https://open.spotify.com/artist/0hCNtLu0JehylgoiP8L4Gh" }, "href" : "https://api.spotify.com/v1/artists/0hCNtLu0JehylgoiP8L4Gh", "id" : "0hCNtLu0JehylgoiP8L4Gh", "name" : "Nicki Minaj", "type" : "artist", "uri" : "spotify:artist:0hCNtLu0JehylgoiP8L4Gh" }, { "external_urls" : { "spotify" : "https://open.spotify.com/artist/7c0XG5cIJTrrAgEC3ULPiq" }, "href" : "https://api.spotify.com/v1/artists/7c0XG5cIJTrrAgEC3ULPiq", "id" : "7c0XG5cIJTrrAgEC3ULPiq", "name" : "Ty Dolla $ign", "type" : "artist", "uri" : "spotify:artist:7c0XG5cIJTrrAgEC3ULPiq" } ], "available_markets" : [ "AD", "AR", "AT", "AU", "BE", "BG", "BO", "BR", "CA", "CH", "CL", "CO", "CR", "CY", "CZ", "DE", "DK", "DO", "EC", "EE", "ES", "FI", "FR", "GB", "GR", "GT", "HK", "HN", "HU", "ID", "IE", "IS", "IT", "JP", "LI", "LT", "LU", "LV", "MC", "MT", "MX", "MY", "NI", "NL", "NO", "NZ", "PA", "PE", "PH", "PL", "PT", "PY", "SE", "SG", "SK", "SV", "TH", "TR", "TW", "US", "UY", "VN" ], "external_urls" : { "spotify" : "https://open.spotify.com/album/2e5CxfyEwBW115beiwh7Mc" }, "href" : "https://api.spotify.com/v1/albums/2e5CxfyEwBW115beiwh7Mc", "id" : "2e5CxfyEwBW115beiwh7Mc", "images" : [ { "height" : 640, "url" : "https://i.scdn.co/image/87d0b1856d2c2ce55fdb4c8129e47a6df6f33aff", "width" : 640 }, { "height" : 300, "url" : "https://i.scdn.co/image/8662260c958cbc63a0f0c671cc95de5bf14f59f2", "width" : 300 }, { "height" : 64, "url" : "https://i.scdn.co/image/2800e9f3f5aadf99620ef196b0d94e602128539f", "width" : 64 } ], "name" : "Swalla (feat. Nicki Minaj & Ty Dolla $ign)", "type" : "album", "uri" : "spotify:album:2e5CxfyEwBW115beiwh7Mc" }, "artists" : [ { "external_urls" : { "spotify" : "https://open.spotify.com/artist/07YZf4WDAMNwqr4jfgOZ8y" }, "href" : "https://api.spotify.com/v1/artists/07YZf4WDAMNwqr4jfgOZ8y", "id" : "07YZf4WDAMNwqr4jfgOZ8y", "name" : "Jason Derulo", "type" : "artist", "uri" : "spotify:artist:07YZf4WDAMNwqr4jfgOZ8y" }, { "external_urls" : { "spotify" : "https://open.spotify.com/artist/0hCNtLu0JehylgoiP8L4Gh" }, "href" : "https://api.spotify.com/v1/artists/0hCNtLu0JehylgoiP8L4Gh", "id" : "0hCNtLu0JehylgoiP8L4Gh", "name" : "Nicki Minaj", "type" : "artist", "uri" : "spotify:artist:0hCNtLu0JehylgoiP8L4Gh" }, { "external_urls" : { "spotify" : "https://open.spotify.com/artist/7c0XG5cIJTrrAgEC3ULPiq" }, "href" : "https://api.spotify.com/v1/artists/7c0XG5cIJTrrAgEC3ULPiq", "id" : "7c0XG5cIJTrrAgEC3ULPiq", "name" : "Ty Dolla $ign", "type" : "artist", "uri" : "spotify:artist:7c0XG5cIJTrrAgEC3ULPiq" } ], "available_markets" : [ "AD", "AR", "AT", "AU", "BE", "BG", "BO", "BR", "CA", "CH", "CL", "CO", "CR", "CY", "CZ", "DE", "DK", "DO", "EC", "EE", "ES", "FI", "FR", "GB", "GR", "GT", "HK", "HN", "HU", "ID", "IE", "IS", "IT", "JP", "LI", "LT", "LU", "LV", "MC", "MT", "MX", "MY", "NI", "NL", "NO", "NZ", "PA", "PE", "PH", "PL", "PT", "PY", "SE", "SG", "SK", "SV", "TH", "TR", "TW", "US", "UY", "VN" ], "disc_number" : 1, "duration_ms" : 216408, "explicit" : true, "external_ids" : { "isrc" : "USWB11700237" }, "external_urls" : { "spotify" : "https://open.spotify.com/track/6kex4EBAj0WHXDKZMEJaaF" }, "href" : "https://api.spotify.com/v1/tracks/6kex4EBAj0WHXDKZMEJaaF", "id" : "6kex4EBAj0WHXDKZMEJaaF", "name" : "Swalla (feat. Nicki Minaj & Ty Dolla $ign)", "popularity" : 87, "preview_url" : "https://p.scdn.co/mp3-preview/9aa4e0500aae8b33d04f031c454688890ab06468?cid=8897482848704f2a8f8d7c79726a70d4", "track_number" : 1, "type" : "track", "uri" : "spotify:track:6kex4EBAj0WHXDKZMEJaaF"

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What code can I write to always just extract the string following this sequence of characters -> "type" : "track", "uri" :

In this case I want to extract the string "spotify:track:6kex4EBAj0WHXDKZMEJaaF" seen at the end of that block, but the parsed JSON string will not always be in this order and might not be in the same position.