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Authentication failed
Databases

MongoDB "Authentication failed": the authSource is usually what's wrong

Fix MongoDB "Authentication failed": set authSource correctly, encode special characters in the URI, check which database holds the user, and handle Docker volumes.

Beginner · 4 min read

ECONNREFUSED 127.0.0.1:27017
Databases

MongoDB "connect ECONNREFUSED 127.0.0.1:27017": why it refuses, and how to fix it

Fix MongoDB "connect ECONNREFUSED 127.0.0.1:27017" and ::1:27017: start mongod, read exit code 14, check bindIp, IPv6 localhost in Node.js, and Docker service names.

Beginner · 4 min read

E11000
Databases

MongoDB "E11000 duplicate key error": read which index, and which value

Fix MongoDB "E11000 duplicate key error": read the index and value in the message, solve dup key null with a partial index, clean up duplicates, handle upsert races.

Beginner · 3 min read