Practical field notes
Developer Guides
These guides explain the decisions behind common debugging tasks. They combine standards-based references with repeatable checks you can use before copying tool output into an application, ticket, or production workflow.
Structured data
How to debug invalid JSON without guessing
Find the first real syntax error, distinguish JSON from JavaScript, and verify the corrected payload.
AuthenticationHow to inspect a JWT without trusting it
Read token claims safely and understand what still must be verified by the receiving application.
Time and dataUnix timestamp troubleshooting
Recognize seconds, milliseconds, timezone display problems, and boundary errors.
EncodingBase64, URL encoding, and the boundary problem
Choose the correct encoding for bytes, URL components, and text without double-encoding data.