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This is happening because your client app (vue.js) is expecting to receive some valid JSON object, but your server is giving a HTML page.
When attempting to convert some string like <html><head>... into a javascript object, your JSON parser fails and gives that error. To replicate this locally, open your developer console and run the following command:
JSON.parse("<html></html>")
To find out what exactly is going wrong, you need to look into the network tab of developer console and look at the server responses for API requests – you expect JSON but server might be serving index.html
Assuming your server side is all good and handles API requests as expected, then it might be a simple error in your vue component – instead of loading your tag data from /api/tag/1 (which gets a valid JSON string), you might be attempting to load /tag/1 (which will only get your index.html).
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