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I tried to run it and it said an error like the title. and this is my code:
const URI = process.env.MONGODB_URL; mongoose.connect(URI, { useCreateIndex: true, useFindAndModify: false, useNewUrlParser: true, useUnifiedTopology: true }, err => { if(err) throw err; console.log('Connected to MongoDB!!!') }) I set the MONGODB_URL in .env :
MONGODB_URL = mongodb+srv://username:<password>@cluster0.accdl.mongodb.net/website?retryWrites=true&w=majority How to fix it?
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The error is because of the new version of the mongoose i.e version 6.0. 6. useNewUrlParser , useUnifiedTopology , useFindAndModify , and useCreateIndex are no longer supported options. Mongoose 6 always behaves as if useNewUrlParser , useUnifiedTopology , and useCreateIndex are true , and useFindAndModify is false .
What version of Mongoose are you using? The useCreateIndex option has been deprecated for a while and removed as of the Mongoose 6 release per No More Deprecation Warning Options: useNewUrlParser , useUnifiedTopology , useFindAndModify , and useCreateIndex are no longer supported options.
How to use it. The unified topology is available now behind the useUnifiedTopology feature flag. You can opt in to using it by passing the option to your MongoClient constructor: const client = MongoClient('mongodb://localhost:27017', { useUnifiedTopology: true });
useNewUrlParser : The underlying MongoDB driver has deprecated their current connection string parser. Because this is a major change, they added the useNewUrlParser flag to allow users to fall back to the old parser if they find a bug in the new parser.
From the Mongoose 6.0 docs:
useNewUrlParser, useUnifiedTopology, useFindAndModify, and useCreateIndex are no longer supported options. Mongoose 6 always behaves as if useNewUrlParser, useUnifiedTopology, and useCreateIndex are true, and useFindAndModify is false. Please remove these options from your code.
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