Dan Lumatic

Web developer. I write about the fiddly parts of web work: JSON formatting, base64, JWT debugging, timestamps, UUID versions. I like small tools that run entirely in the browser.

Joined on Oct 15, 2026

Dan Lumatic

Nov 5

An LLM edited a small model's weights directly and its math score rose 6x

#ai #machinelearning #webdev

6 min read

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Dan Lumatic

Nov 3

Why banks block AI agents at the login

#ai #cybersecurity #security #webdev

5 min read

Dan Lumatic

Nov 3

Image to base64: when inlining helps and when it hurts

#javascript #python #webdev #security

6 min read

Dan Lumatic

Nov 1

Gemini 4 Carbon tops the charts. You still can't use it.

#ai #gemini #google #machinelearning

2 min read

Dan Lumatic

Oct 29

JSON Patch explained: how to apply one in JavaScript and Python

#json #javascript #python #webdev

5 min read

Dan Lumatic

Oct 29

JWT verification failing? The error map that names the cause

#security #python #webdev #authentication

6 min read

Dan Lumatic

Oct 27

OpenAI's Red-Team Agents Chained Flaws Into microVM Escapes. Check Your Kata Version.

#ai #cybersecurity #openai #docker

5 min read

Dan Lumatic

Oct 26

UUIDs in Python: which version to use, what uuid1 leaks, and how to store them

#python #database #tutorial #postgres

6 min read

Dan Lumatic

Oct 22

JSON to CSV in Python: the pandas recipe that survives nested data

#python #pandas #data #tutorial

5 min read

Dan Lumatic

Oct 20

URL parts explained: how to parse a URL in Python and JavaScript

#web #beginners #javascript #python

6 min read

Dan Lumatic

Oct 17

Pretty print JSON in Python: json.dumps, json.tool, and the three errors you will hit

#beginners #python #json #tutorial

6 min read

DEV Community

Dan Lumatic

Badges

Writing Debut

An LLM edited a small model's weights directly and its math score rose 6x

Want to connect with Dan Lumatic?

Why banks block AI agents at the login

Image to base64: when inlining helps and when it hurts

Gemini 4 Carbon tops the charts. You still can't use it.

JSON Patch explained: how to apply one in JavaScript and Python

JWT verification failing? The error map that names the cause

OpenAI's Red-Team Agents Chained Flaws Into microVM Escapes. Check Your Kata Version.

UUIDs in Python: which version to use, what uuid1 leaks, and how to store them

JSON to CSV in Python: the pandas recipe that survives nested data

URL parts explained: how to parse a URL in Python and JavaScript

Pretty print JSON in Python: json.dumps, json.tool, and the three errors you will hit