Disable "development mode" warning in VueJS

Open file app.js and add the next code

Vue.config.productionTip = false

Read more in Vue Api

As of Vue.JS 2.2.0 the development warning can be disabled as follows:

Vue.config.productionTip = false

should be added to main.js (or main.ts if using TypeScript)

In Vue 3, Vue.config.productionTip = false has been removed without an alternative to disable the "development mode" warning (see Vue 3 Migration Guide).