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From my understanding, Vue is a client-side Javascript application.
For GET parameters, these appear in the URL and hence can be accessed by your Vue app (or any JS script).
POST params are only handled on the server-side. They cannot be accessed by a JS/Vue App. You have to think of an alternate way of making the params accessible to your application such as by setting cookies, sessionStorage, etc.
Refer: How to read the post request parameters using javascript
Source:stackexchange.com