[Vuejs]-Data not binding to the textarea

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Guessing that the axios request is inside any lifecycle hook or any method…this inside success callback does not point to the vue instance, that’s why you cannot mutate the data property.

Use an arrow function instead:

axios({
            method: 'post',
            url: 'http://localhost/test,
            responseType: 'json',
            data: {
              data: this.test
            }
          }).then( (response) => {
            this.test= response.data
          }).catch( (error) => {
            console.log(error)
          });

Fat arrow functions => bind this lexically, so you have this pointing the vue instance

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