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        before being able to upvote. Upvoting indicates when questions and answers are useful. (https://stackoverflow.com/help/whats-reputation) What's reputation and how do I get it?  Instead, you can save this post to reference later.     Save this post for later Not now           (https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon.png?v=c78bd457575a) (/questions/69068272/uncaught-typeerror-cannot-read-properties-of-undefined-reading-replace) Uncaught TypeError: Cannot read properties of undefined (reading 'replace')  (/questions/ask) Ask Question     (2021-09-06 01:10:19Z) Asked 3 years, 7 months ago  Modified (?lastactivity) (2022-05-16 01:27:00Z) 2 years, 11 months ago  (Viewed 197,710 times) Viewed 198k times         This question shows research effort; it is useful and clear  (70:3:31e,16:ab440a7ec5687e4a,10:1744940576,16:3bc91ddb128238c1,8:69068272,b6c3dbb64fc1a3428159ed856df7c5df27d03d4a7dc799388ab8c252db661973) 13  (This question does not show any research effort; it is unclear or not useful)    (70:3:31e,16:1fd7b364aa6d746b,10:1744940576,16:388bac6ed49abd23,8:69068272,42965909b8266faeb75a80e9805e716dec3d86b7703d7e62fc9f2025ad7d6beb)      Save this question.  (/posts/69068272/timeline)    Show activity on this post.    I am presenting this error when uploading the player to the server since locally it works fine. Let me explain a bit, the player locally shows the song that is playing, the one that is coming and the one that has already played, but when uploading to the server I get the following error: Uncaught TypeError: Cannot read properties of undefined (reading 'replace' ) in the following lines of code but I don't exactly understand why. I would like to know if you can guide me on this to finish this project and deliver it, thanks in advance. let song = data.currentSong .replace (/'/g , '\'' );
    currentSong = song.replace (/&/g , '&' ); let artist = data.currentArtist .replace (/'/g , '\'' );
    currentArtist = artist.replace (/&/g , '&' );    (/questions/tagged/javascript) (show questions tagged 'javascript') javascript  (/questions/tagged/replace) (show questions tagged 'replace') replace      (/q/69068272) (Short permalink to this question) Share  Share a link to this question     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/69068272/edit) () Improve this question  Follow (70:3:31e,16:b63269a3ea400a17,10:1744940576,16:367003419fa15792,8:69068272,38f018ef1278103578263f1c5cfada9c9bd06b82bb555bbf50b9c071fb738d0e)  Follow this question to receive notifications       asked (2021-09-06 01:10:19Z) Sep 6, 2021 at 1:10   (/users/16838071/diego-morejon) (Diego Morejon's user avatar)    (/users/16838071/diego-morejon) Diego Morejon Diego Morejon (reputation score) 165 (1 gold badge)  1  1 gold badge (1 silver badge)  1  1 silver badge (6 bronze badges)  6  6 bronze badges        3   I think your data.currentSong or data.currentArtist is undefined – (/users/6099811/navnath) (3,724 reputation) navnath  Commented (2021-09-06 01:14:32Z, License: CC BY-SA 4.0) Sep 6, 2021 at 1:14        But what difference could there be between the web server and the local server? On my local server, that is, it works fine on my laptop, but not on the web server. – (/users/16838071/diego-morejon) (165 reputation) Diego Morejon  Commented (2021-09-06 01:29:37Z, License: CC BY-SA 4.0) Sep 6, 2021 at 1:29        where you get /set data? can you share that code – (/users/6099811/navnath) (3,724 reputation) navnath  Commented (2021-09-06 01:49:35Z, License: CC BY-SA 4.0) Sep 6, 2021 at 1:49        (Use comments to ask for more information or suggest improvements. Avoid answering questions in comments.) Add a comment |  (Expand to show all comments on this post)          2 Answers 2   Sorted by:  (/questions/69068272/uncaught-typeerror-cannot-read-properties-of-undefined-reading-replace?answertab=scoredesc#tab-top) Reset to default   (scoredesc) Highest score (default)  (trending) Trending (recent votes count more)  (modifieddesc) Date modified (newest first)  (createdasc) Date created (oldest first)            This answer is useful  (70:3:31e,16:a539ede8e7a8b65c,10:1744940576,16:e1fb000a930d8f85,8:72170023,b3fc033196b48539987537d5481246339dc705865d0cc27b8907d9ead32f01de) 15  (This answer is not useful)    (70:3:31e,16:a38e43c988c6af5e,10:1744940576,16:7da50a442d4a199d,8:72170023,2c31ea3f660caa50cbe55b1bef22408bd3d6a6cb6f4788e204b4d5262da30e0c)      Save this answer.  (Loading when this answer was accepted…)     (/posts/72170023/timeline)    Show activity on this post.    I had the same error and I fixed it like this: Before: localizeDate (date ) {
   date = date.replace ("T" , "/" ); return date.replace (".000000Z" , "" );
 },   After: localizeDate (date ) { if (!date) return date = date.replace ("T" , "/" ); return date.replace (".000000Z" , "" );
},   The issue is that the function is called before any data loads from the server. You could also fix it with Promises, async/wait or loaders.   (/a/72170023) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/72170023/edit) () Improve this answer  Follow (70:3:31e,16:e17ed4e739ec8951,10:1744940576,16:98488f8d02819c16,8:72170023,a39ffbac9eaa130d967a3e4181fa930cb9f4a85619552f83ed9a973714ab2be8)  Follow this answer to receive notifications       (/posts/72170023/revisions) (show all edits to this post) edited (2022-05-16 01:27:00Z) May 16, 2022 at 1:27    (/users/14190543/zach-jensz) (Zach Jensz's user avatar)    (/users/14190543/zach-jensz) Zach Jensz (reputation score) 4,076 (6 gold badges)  6  6 gold badges (17 silver badges)  17  17 silver badges (31 bronze badges)  31  31 bronze badges     answered (2022-05-09 09:48:11Z) May 9, 2022 at 9:48   (/users/11516722/asyia) (Asyia's user avatar)    (/users/11516722/asyia) Asyia Asyia (reputation score) 151 (1 silver badge)  1  1 silver badge (6 bronze badges)  6  6 bronze badges        1 (number of 'useful comment' votes received) 1   Thanks I'm going to try this too, the other solution stopped working. – (/users/16838071/diego-morejon) (165 reputation) Diego Morejon  Commented (2022-05-10 03:10:45Z, License: CC BY-SA 4.0) May 10, 2022 at 3:10        (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)             This answer is useful  (70:3:31e,16:ca50f5a7bdfc6f94,10:1744940576,16:7e2a3e6eb16f0fae,8:69144850,57c1ace240ef98c2eb48c5f12c14330700882f1178c24bf086770cf930944745) 13  (This answer is not useful)    (70:3:31e,16:95797a9f0b51e785,10:1744940576,16:f246e38c0ed9205b,8:69144850,61d3e0d4d5a5d591ef10fd93b436c1d4d956b20fcaf169117a5b81e85e660ad7)      Save this answer.  (Loading when this answer was accepted…)     (/posts/69144850/timeline)    Show activity on this post.    In your example Uncaught TypeError: Cannot read properties of undefined (reading 'replace' ) can occur only if your variables song and/or artist are undefined . That means either data.currentSong or data.currentArtist or both of them getting you undefined result. Answer to your question:There could be some differences between the web server and the local server. For example, sometimes the jQuery version of local server is different than the web server. The exact source of the issue could be found, if you can share the code which is responsible to get you the data.   (/a/69144850) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/69144850/edit) () Improve this answer  Follow (70:3:31e,16:952e0abcbf10a258,10:1744940576,16:e5c760a1db281398,8:69144850,d98b8e0a663c5adca2086bd5839d9375bf0bcb3144ddf181dc391a19e9281fc8)  Follow this answer to receive notifications       answered (2021-09-11 16:31:44Z) Sep 11, 2021 at 16:31   (/users/7242609/fluent-themes) (Fluent-Themes's user avatar)    (/users/7242609/fluent-themes) Fluent-Themes Fluent-Themes (reputation score) 194 (1 silver badge)  1  1 silver badge (3 bronze badges)  3  3 bronze badges           (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) 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