Troubleshooting Guides

Short, practical explanations for errors developers hit constantly — what causes them, and the fastest way to fix them.

JSON

• Fixing "Unexpected token" in JSON
• JSON trailing comma error, explained
• JSON Schema "additionalProperties" errors, explained

JWT

• JWT signature verification failed — causes and fixes
• "jwt malformed" / "Not enough segments" error, explained
• RS256 vs HS256: which JWT algorithm should you use?

Timestamps & Identifiers

• Unix timestamp: seconds vs milliseconds
• UUID v4 vs v7: which one should you use?
• "Invalid character" / invalid Base64 string, explained

YAML & Regex

• YAML bad indentation error, explained
• "Invalid regular expression" error, explained