How to Fix “Vue Warn Error in Mounted Hook Typeerror This Store is Undefined” in Vuex

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The error message “TypeError: this.$store is undefined” typically occurs in Vue.js when you are trying to access the Vuex store in a component’s mounted hook, but the component is not properly connected to the store.

To fix this error, you need to make sure that the component is properly connected to the store using the Vuex library.

Here are some steps you can take to fix this error:

  1. First, make sure that you have properly installed the Vuex library and imported it into your Vue.js project.
  2. Then, in your component, make sure that you are importing the Vuex library and using the mapState helper function to map the store’s state to the component’s computed properties.
  3. Check that you have defined the store property in the Vue instance and passed it the Vuex store.
  4. Finally, make sure that you are accessing the Vuex store correctly in your component’s mounted hook by using this.$store.

Here is an example of how to properly connect a component to the Vuex store:

<template>
  <div>{{ message }}</div>
</template>

<script>
import { mapState } from 'vuex'

export default {
  computed: {
    ...mapState({
      message: state => state.message
    })
  },
  mounted() {
    console.log(this.$store.state.message)
  }
}
</script>

In this example, we are using the mapState helper function to map the message property of the store’s state to the component’s message computed property. We are also accessing the store’s message state in the mounted hook using this.$store.state.message.

Make sure to double-check that you have followed all the above steps to properly connect the component to the Vuex store.

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