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Backend Engineering How to Implement JWT Authentication Properly — Access Tokens, Refresh Tokens, and Common Mistakes Database Systems How to Diagnose and Fix MySQL Replication Lag Cyber Security How to Audit Linux File Permissions and Find Security Holes Cyber Security How to Harden SSH and Stop Brute Force Attacks on Linux Servers — Read the Logs Before You Lock the Door Database Systems How to Find and Fix Slow Queries in PostgreSQL — Read EXPLAIN ANALYZE Before You Add Random Indexes Backend Engineering How to Implement JWT Authentication Properly — Access Tokens, Refresh Tokens, and Common Mistakes Database Systems How to Diagnose and Fix MySQL Replication Lag Cyber Security How to Audit Linux File Permissions and Find Security Holes Cyber Security How to Harden SSH and Stop Brute Force Attacks on Linux Servers — Read the Logs Before You Lock the Door Database Systems How to Find and Fix Slow Queries in PostgreSQL — Read EXPLAIN ANALYZE Before You Add Random Indexes
Diagram showing JWT token flow between client and server
Backend Engineering

How to Implement JWT Authentication Properly — Access Tokens, Refresh Tokens, and Common Mistakes

Most JWT tutorials store tokens in localStorage and skip refresh flow. Here's how to implement JWT auth that actually holds up in production — proper token pairs, secure storage, and revocation.

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MySQL SHOW REPLICA STATUS showing high Seconds_Behind_Master
Database Systems

How to Diagnose and Fix MySQL Replication Lag

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Linux terminal showing find command results for SUID files
Cyber Security

How to Audit Linux File Permissions and Find Security Holes

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