"ConnectionError" when trying to run a SELECT statement from an Express typescript app using mssql package
📰 Reddit r/learnprogramming
Fix ConnectionError when connecting to SQL Server from an Express TypeScript app using mssql package
Action Steps
- Check SQL Server instance configuration to ensure it allows both Windows and SQL Server authentication
- Verify SQL Server is listening on the specified IP address and port 1433
- Update config options in the Express app to match the SQL Server instance configuration
- Test the connection using a tool like sqlcmd to isolate the issue
- Apply the correct connection string in the mssql package configuration
Who Needs to Know This
Backend developers and database administrators can benefit from this solution to resolve connection issues with SQL Server
Key Insight
💡 Ensure SQL Server instance configuration matches the connection string in the mssql package
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🚨 Fix ConnectionError in Express TypeScript app with mssql package 🚨
Key Takeaways
Fix ConnectionError when connecting to SQL Server from an Express TypeScript app using mssql package
Full Article
The error is: "ConnectionError: Failed to connect to localhost\SQLEXPRESS01 in 30000ms at connectListener (C:\...\mssql\lib\tedious\connection-pool.js86:17)" I made sure that the SQL Server instance is set to allow both Windows auth and SQL Server auth. I also configured SQL Server to listen on a specific IP address and port 1433, which I added into my config options in my Express app submitted by <a href="https://www.reddit.c
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