`The provided database string is invalid. Unable to parse URL. in database URL.` on invalid (?) connection string

Something in this connection string seems to be weird, but the error message also does not make sense:

Connection string:

mongodb://localhost:C2y6yDjf5/R+ob0N8A7Cgv30VRDJIWEHLM+4QDU5DE2nQ9nDuVTqobD4b8mGGyPMbIZnqyMsEcaGQy67XIw/Jw==@localhost:10255/e2e-tests?ssl=true

Error message:

D:\a\e2e-tests\e2e-tests\databases-windows\mongodb-azure-cosmosdb-emulator\script.ts:7:21

   4 
   5 // A `main` function so that we can use async/await
   6 async function main() {
→  7   await client.user.deleteMany(
  The provided database string is invalid. Unable to parse URL. in database URL. Please refer to the documentation in [prisma.io/docs/reference/database-reference/connection-urls](https://www.prisma.io/docs/reference/database-reference/connection-urls) for constructing a correct connection string. In some cases, certain characters must be escaped. Please check the string for any illegal characters.
    at cb (D:\a\e2e-tests\e2e-tests\databases-windows\mongodb-azure-cosmosdb-emulator\node_modules\@prisma\client\runtime\index.js:39809:17) {
  clientVersion: '3.10.0-dev.54',
  errorCode: undefined
}

[stevemu]

for me, I had to define the “authentication database” to make it work, so:

this didn’t work (in .env):

DATABASE_URL="mongodb+srv://user:[e-mail]/?retryWrites=true&w=majority"

this works:

DATABASE_URL="mongodb+srv://user:[e-mail]/my-db?retryWrites=true&w=majority"

otherwise I would get Error: Error parsing connection string: Database must be defined in the connection string error

[grantjayy]

@stevemu This worked for me - thank you for this