Answers for "(node:4) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead."

collection.ensureIndex is deprecated

mongoose.connect(dbURI, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
    useFindAndModify: true,
})

(node:3168) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead. (Use `node --trace-deprecation ...` to show where the warning was created)

mongoose.set('useCreateIndex', true);

(node:14800) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead. (Use `node --trace-deprecation ...` to show where the warning was created)

mongoose
  .connect(process.env.DB_CONNECTION, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    dbName: "business",
    useCreateIndex: true
  })

(node:2736) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.

mongoose.connect(
  url,
  {useCreateIndex: true },
  () => {
    console.log("MongoDB is connected!");
  }
);