2025-11-16 20:19:00
Hi all,
Sometime when my though wandering the world, I just wonder how amazing TCP was design. The world all connect together because of it. Sometime you disconnect your VPN, then re-connect, and your SSH connection just resume. How amazing resilient it is. Today we discover that by learning about TCP protocol.
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Developers earned $563K in September alone building automation tools on Apify. Now there’s $1M more in prizes through January 31. Build web scrapers, API wrappers, MCP servers for AI agents. Earn up to $2K per tool based on monthly active users, compete for $30K/$20K/$10K grand prizes, plus $2K weekly spotlight prizes. Ongoing marketplace revenue continues after the challenge ends.
The internet is incredible. It’s nearly impossible to keep people away from. But it can also be unreliable: packets drop, links congest, bits mangle, and data corrupts. Oh, it’s dangerous out there! (I’m writing this in Kramer’s tone)
Sometimes you just want something that: Works with your existing database, Doesn’t require external services, Is easy to understand and debug. That’s what the OP built. A search engine that uses your existing database, respects your current architecture, and gives you full control over how it works.
Marginalia is an experimental search engine. The Marginalia Search index has been partially rewritten to perform much better, using new data structures designed to make better use of modern hardware. This post will cover the new design, and will also touch upon some of the unexpected and unintuitive performance characteristics of NVMe SSDs when it comes to read sizes.
As a computer engineer who has spent half a decade working with caches at Intel and Sun, I’ve learnt a thing or two about cache-coherency. This was one of the hardest concepts to learn back in college – but once you’ve truly understood it, it gives you a great appreciation for system design principles.
I decided to experiment with writing an object store from scratch as a fun learning exercise, and to see how much I could get out of NVMe disks I had on my bare metal machines. Specifically, I wanted to really optimize for random reads and small objects — serving user content where the lower the latency, the better. This would not focus on other features; S3 is bottomless, distributed, and managed for example.
Postgres has an awesome amount of data collected in its own internal tables. Postgres hackers know all about this - but software developers and folks working with day to day Postgres tasks often miss out the good stuff. Today I want to walk through some of the most important Postgres internal data catalog details. What they are, what is in them, and how they might help you understand more about what is happening inside your database.
This could be a cheap way to have a Kafka-like consumer out of the box by consuming your Postgres WAL log. WAL log is like a stream of change happen to your database (update/create/delete) and you can decode them to JSON to see the change and act on them
A deep dive into how JavaScript source maps work under the hood, with examples showing how all the pieces fit together.
Beside the usualy way of await fetch to load JSON API, we now can also use import directly. We had this in NodeJS with build tool already but now it’s natively available in the browser too. Lets see when we should use what.
Easy-to-deploy, open source PostgreSQL function that provides a prioritized list of actions to improve database stability and performance.
Filter sensitive information from free text before sending it to external services or APIs, such as chatbots and LLMs.
Easily setup logical replication and switchover to new database with minimal downtime
a handy JavaScript plugin for generating and animating nice & clean dashboard gauges. It is based on Raphaël library for vector drawing
javascript navigation mesh construction and querying library for 3D floor-based navigation
Minimal neofetch-like weather CLI. Just fun code to read.
Public Open Relay To Access Localhost
A lightweight vLLM implementation built from scratch.
A modern static site generator by the creators of Material for MkDocs
OCR model that handles complex tables, forms, handwriting with full layout.
Perspective is an interactive analytics and data visualization component, which is especially well-suited for large and/or streaming datasets. Use it to create user-configurable reports, dashboards, notebooks and applications, then deploy stand-alone in the browser, or in concert with Python and/or Jupyterlab.
A minimalist extension and utility pair for time series analysis and visualization of PostgreSQL internal statistics.
Nagios check_postgres plugin for checking status of PostgreSQL databases. You probably cannot use this as it’s because it’s for Nagios but the script can adopt to any monitoring system.
Minimal RFC 5424 syslog collector and viewer based on DuckDB. Runs as a single, resource-friendly process
Advanced select dropdown without any dependencies
HTTP & OAuth Gateway and Web Application Firewall (WAF) based on ModSecurity
Lightweight status page for home infrastructure
2025-10-20 20:19:00
Hi all,
It’s already autumn and we will continue to get more issue moving forward. Hope everyone have a great haloween ahead. I also shared a story about someone almost got hack by being trick into running code for an interview. Remind so stay safe these day, never run untrusted code on your machine.
If you enjoy BetterDev, please spread the word by sharing it with your friends. And if you’d like to support my work, buying me a coffee would be much appreciated.
The HubSpot Developer Platform gives you the tools to build, extend, and scale with confidence. Create AI-ready apps, integrations, and workflows faster with a unified platform designed to grow alongside your business.
May sound overwhelm but it’s very approachable with step by step building from previous foundation. Eg to write the initial boot loader you just need: loop: jmp loop
times 510-($-$$) db 0 dw 0xaa55
A very detail setup so you can prepare emulator to start learning these.
Every time you use a computer, caches work to ensure your experience is fast. Everything a computer does from executing an instruction on the CPU, to requesting your X.com feed, to loading this very webpage, relies heavily on caching. You are about to enjoy a guided, interactive tour of caching: the most elegant, powerful, and pervasive innovation in computing.
A visual introduction to big O notation.
This post is an introduction to consistent hashing, an algorithm for designing a hash table such that only a small portion of keys has to be recomputed when the table’s size changes.
By default all of the Postgres data stay in the same directory, under the same path and therefore the same volume. This limit our scale, many cloud provider has a max volume size, and they all share same IO. What can we do to put the database at different location instead?
Be careful out there with sophisicated phishing attempt nowadays. Bottom line is never ever run untrusted code directly on your machine.
Maybe you’re debugging a network request, but the stack trace has been laundered away by a batching mechanism. Maybe you have an enormous React codebase with kilometers of prop drilling, and you can’t be bothered to hit Go To References all morning. In any case, sometimes you just wish you could see where that specific object in the debugger was created.
Once you get into the business of starting threads, you’re probably also in the business of stopping them. However the former is much easier than the latter. With “stopping” I mean stopping the thread while giving it a chance to run some cleanup operations before fully terminating. Or in other words, we want to terminate a thread while ensuring that memory is freed, locks are released, logs are flushed, and so on
Rack middleware for blocking & throttling
A lightweight terminal UI for displaying Go tests
♪ A low-level library to play sound on multiple platforms ♪
keeps PostgreSQL/MySQL/MariaDB as your source of truth and publishes denormalized documents to Elasticsearch/OpenSearch—continuously and transactionally.
A PostgreSQL extension that provides infinite calendar functionality for recurring schedules with exceptions
Fast & free browser trusted HTTPS certificates
Visual Development for React, Vue, Svelte, Qwik, and more
2025-09-08 20:19:00
Hi all,
We came back with other issue. I had got a new job with lot of duties last few month but things are cooling down so we’re going back :).
My friend, Joel Dare has also start writing a news letter, you may consider to subscribe there. He’s also creator of neat which as its name, a very neat css framework.
If you enjoy BetterDev, please spread the word by sharing it with your friends. And if you’d like to support my work, buying me a coffee would be much appreciated.
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The Apollo “8-Ball” FDAI (Flight Director/Attitude Indicator) was a crucial instrument in Apollo spacecraft, used to display the vehicle’s orientation. The article details its complex internal workings, which include a multi-axis rotating ball mechanism driven by three motors and a servo loop. The specific unit examined was later modified for use in a Space Shuttle simulator, with changes made to its components and markings.
There are some latency numbers that every programmer should know, according to Jeff Dean, and one of them is branch misprediction, which costs around 5ns in 2012, and the latency remains roughly the same as the time of writing this post. So what is branch prediction, what happens when it’s mispredicted, and why is it costly?
Making programs slower can be useful to find race conditions, to simulate speedups, and to assess how accurate profilers are. To detect race conditions, we may want to use an approach similar to fuzzing. Instead of exploring a program’s implementation by varying its input, we can explore different instruction interleavings, thread or event schedules, by slowing down program parts to change timings. This approach allows us to identify concurrency bugs and is used by CHESS, WAFFLE, and NACD.
UIDv7 is a highly important and long-awaited feature that addresses a major pain point for developers who use UUIDs as primary keys in databases. Unlike older versions like UUIDv4, which are randomly generated and lead to poor performance and index bloat in B-tree indexes, UUIDv7 incorporates a Unix Epoch timestamp. This makes it time-ordered, ensuring that new UUIDs are inserted sequentially, which significantly improves performance for write-heavy workloads. The article emphasizes that this quiet but impactful addition “brings the best of both worlds” by providing global uniqueness while also being sortable and performance-friendly.
I always like syntax highling algorithm. It’s something we take for granted and didn’t ask how it can be done. Andy walked us through how he do it for his own shell language.
The webpage describes a new method for GPU text rendering that uses vector data of glyphs instead of pre-baked textures, addressing issues like poor quality with certain fonts and large texture sizes. The approach involves loading raw Bézier curves, sending them to the GPU, and rasterizing them at runtime with a temporal accumulation technique for high-quality anti-aliasing. This method also allows for customized subpixel anti-aliasing to eliminate color fringing on different monitor layouts.
Collaboratively editing strings of text is a common desire in peer-to-peer applications. For example, a note-taking app might represent each document as a single collaboratively-edited string of text.
The algorithm presented here is one way to do this. It comes from a family of algorithms called CRDTs, which I will not describe here. It’s similar to the approaches taken by popular collaborative text editing libraries such as Yjs and Automerge. Other articles have already been written about these similar approaches (see the references section below), but this article also has a nice interactive visualization of what goes on under the hood.
Speed kills rigor. In startups, the pressure to ship fast pushes teams to report anything that looks like an improvement. That’s how p-hacking happens. This piece breaks down three common cases—and how to avoid them
explains how Compiler Explorer works, a popular online tool for compiling code and viewing assembly output. The site handles millions of compilations annually, using Google’s nsjail tool for security to isolate compilation processes. To manage a massive 4 terabyte collection of over 4,700 compiler versions and reduce latency, it uses squashfs images mounted over NFS. The article concludes by discussing the site’s future plans, including the addition of an AI explanation tool and user accounts.
Have you ever scratch your head and see why your program seems hang? with very low CPU utilization? When you do strace it just show a bunch of FUTEX. In this short article we just learn some useful options and flags of strace to debug these easiser
the short of it is: they’re cool for appending notes from automated systems (like ticket or build systems) but not really for having interactive conversations with other developers (at least not yet)
A reimplementation of Stable Diffusion 3.5 in pure PyTorch. The Hacker News thread also had a lot of userful and great comment.
a Makefile formatter and linter. It only took 50 years!
Natural (“version number”) sorting with support for: name, legal doc numbering,
A tiny query language for filtering structured data
JavaScript UI component for interacting with audio waveforms
Animation engine for explanatory math videos
Link-Layer MAC spoofing GUI for macOS
run and test HTTP requests with plain text.
Active-active Replication Extension for PostgreSQL (pgactive)
Cloud-Native PostgreSQL WAL receiver. Stream, compress, encrypt, upload, retain and monitor your WAL archive.
Tiny S3 client. Edge computing ready. No-dep. In Typescript. Works with @cloudflare @minio @Backblaze @digitalocean @garagehq
A powerful, real-time log analysis terminal UI inspired by k9s. Analyze log streams with beautiful charts, AI-powered insights, and advanced filtering - all from your terminal
2025-06-08 20:19:00
Hi all,
I recently becomes a heavy LLM user in coding, It helps me write a lot of helper and tedious script which will take me days or even weeks now I can do in 1⁄10 of time. It is great when you know how to do something but dont’ want to sit down and write it. Especially on UI. So I plan to share more about LLM/AI to help all of us.
On other note, Mozilla is shutting down Pocket on July 8, 2025. In spirit of self-hosted, I had switch to linkding. I wrote this simple script to import Pocket archive to linkding. The script was written by Gemini btw.
If you enjoy BetterDev, please spread the word by sharing it with your friends. And if you’d like to support my work, buying me a coffee would be much appreciated.
Customer Data You Can Depend On
We know you run your business on data, so you better be able to depend on it.
Twilio Segment was purpose-built so that you don’t have to worry about your data. Forget the data chaos, dissolve the silos between teams and tools, and bring your data together with ease.
So that you can spend more time innovating and less time integrating.
Talk to sales and get a guided tour of Twilio Segment tailored to your business.
People say many things about entropy: entropy increases with time, entropy is disorder, entropy increases with energy, entropy determines the arrow of time, etc.. But I have no idea what entropy is, and from what I find, neither do most other people. This is the introduction I wish I had when first told about entropy, so hopefully you find it helpful. My goal is that by the end of this long post we will have a rigorous and intuitive understanding of those statements, and in particular, why the universe looks different when moving forward through time versus when traveling backward through time.
The Cinema Industry is using its own standards for creating and distributing movies in a secure way. The DCI (Digital Cinema Initiatives) specification defines everything from file formats and encryption to the projection systems itself.
The specification itself is publicly available but relies on various IEEE (Institute of Electrical and Electronics Engineers) and SMPTE (Society of Motion Picture and Television Engineers) standards, which have to be purchased.
At scale of OpenAI, I imagine they might shard PostgreSQL. But they utilize an unsharded architecture with one writer and multiple readers, demonstrating that PostgreSQL can scale gracefully under massive read loads.
Email is very well distributed where you cannot get lock down by a provider. As long asyou own domain, you can move email anywhere. In email world, generally SMTP is for sending email and IMAP is for receiving mail. In this article, we focus on IMAPv4.
In this section, I talk about why VPCs were invented and how they work. This is critical to understand because almost everything you do in AWS will happen inside of VPC. If you don’t understand VPCs, it will be difficult to understand any of the other networking concepts.
Printing on unix-like operating systems like Linux or macOS is usually done through the CUPS daemon. CUPS is responsible for handling printer configuration, scheduling print jobs and actually talking to the printer over the wire. In this article we discuss a printer system for ticket using FGL. And they implement a CUPS driver to take the rastered pixel data and ouput FGL.
A deeper look at how PostgreSQL logical replication works, from WAL internals and logical decoding to streaming protocols and replica lag. If you’ve ever wondered what’s happening under the hood, this post connects the dots.
Think of this post as your field guide to a new way of building software. By the time you finish reading, you’ll understand not just the how but the why behind AI-assisted development that actually works.
diffing dataset is very useful in data engineering. incremental syncing, detect drift etc. how can we create a tool that could efficiently diff large SQL datasets across different databases and servers. This article build such as a tool with: Divide, Hash, And Conquer
Instead of renting the GPU we can pay up-front cost to build a server with GPU. This post can serve as a simple foundation into this process with sourcing parts and assbler thing together.
Every backend dev will hit file limit at some point and we run something like ulimit -n 65000 to fix it. But how we debug it, how we find out how many file it openning? and what is these file descriptor.
Warpstream control plane is written in Go, which has excellent built-in support for debugging application memory issues with pprof. We’ve used pprof hundreds of times in the past to debug performance issues, and usually memory leaks are particularly easy to spot. But in this case, this isn’t something that pprof could help with.
Curated collection of system prompts for top AI tools. Perfect for AI agent builders and prompt engineers. Incuding: ChatGPT, Claude, Perplexity, Manus, Claude-Code, Loveable, v0, Grok, same new, windsurf, notion, and MetaAI.
A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools and more.
Customer Data You Can Depend On
We know you run your business on data, so you better be able to depend on it.
Twilio Segment was purpose-built so that you don’t have to worry about your data. Forget the data chaos, dissolve the silos between teams and tools, and bring your data together with ease.
So that you can spend more time innovating and less time integrating.
Talk to sales and get a guided tour of Twilio Segment tailored to your business.
Use Ruby DSL to let AI Model call function inside your Ruby app
A Ruby implementation of a Model Context Protocol (MCP) server for Rails projects. This server allows LLMs (Large Language Models) to interact with Rails projects
A Go implementation of the Model Context Protocol (MCP), enabling seamless integration between LLM applications and external data sources and tools.
Go bindings for the Chafa terminal graphics library. Render high quality images on the terminal without CGO or external dependencies.
offers a modern, Pythonic interface to FFmpeg, providing extensive support for complex filters with detailed typing and documentation.
Online webgl photo editor with effects, filters and cropping
Browser’s End-user Automation CLI Hub. Potentialize All Tasks Regarding Online Life.
442 open source icons in 2 styles, made for interfaces. MIT license
Build by the fame depesz, it tells you what you got between 2 PG version.
A simple list of all PostgreSQL parameter.
airplay to an ios device, use your iphone as an airplay receiver
Python tool for converting files and office documents to Markdown.
Effortless LLM extraction from documents
Postgres MCP Pro is an open source Model Context Protocol (MCP) server built to support you and your AI agents throughout the entire development process—from initial coding, through testing and deployment, and to production tuning and maintenance.
Postgres extension and service for automated failover and high-availability
🔥 ~6x faster, stricter, configurable, extensible, and beautiful drop-in replacement for golint
Advanced PostgreSQL & Pgbouncer Metrics Exporter for Prometheus
2025-03-31 20:19:00
Hi all,
So this week, Github CodeQL leaked their token; the token was only publicly exposed for about 2 seconds, but that’s enough. Then, we had Malware found on npm infecting local packages with a reverse shell. And an atop heap issue. The world truly fell apart last week, no joke. That’s why it’s helpful to be paranoid whenever we run any piece of software on our CI, on our dependencies—always vet them yourself.
If you enjoy BetterDev, please spread the word by sharing it with your friends. And if you’d like to support my work, buying me a coffee would be much appreciated.
An in-depth exploration of the evolution of PostgreSQL’s buffer manager locking mechanisms over three decades, highlighting key design decisions and their impact on performance and concurrency.
A guide offering practical advice on crafting technical blog posts that effectively engage and inform developer audiences, emphasizing clarity, structure, and relevance.
An overview of identity tokens, detailing their role in authentication and authorization processes, and providing best practices for implementing secure and efficient access control mechanisms.
A technical analysis by Google’s Project Zero team on the NSO Group’s BLASTPASS exploit, which targeted Apple’s iMessage using malicious WebP images to achieve zero-click remote code execution.
A concise reference guide summarizing key algorithms related to visual data processing, offering quick insights into their applications and implementations.
If you have some old Raspberry Pi hardware lying around, this could be a great hobby project.
An examination of the relationship between MySQL’s transaction throughput and the filesystem’s synchronization operations, discussing how fsync frequency impacts database performance.
An article discussing techniques to enhance shell history search functionality, including the integration of tools like fzf for more efficient command retrieval and improved productivity.
A discussion on transformative PostgreSQL design patterns, such as using UUID primary keys, implementing timestamp fields, enforcing strict foreign key constraints, utilizing schemas for organization, and employing enum tables for data integrity.
A comprehensive guide addressing PostgreSQL’s transaction isolation anomalies, providing practical examples and strategies to understand and mitigate issues like dirty reads, lost updates, and phantom reads.
Single sign-on for SSH is a dream. No longer dealing with keys, editing ~/authorized_keys files, or modifying LDAP or PAM configurations. Easy to revoke and offboard developers.
An introduction to the Model Context Protocol (MCP), explaining its purpose, functionality, and how it can streamline development processes by providing contextual model information.
A fast approximate nearest neighbor search library for Go
A simple Physics engine in GoLang
A Rust implementation of a fast audio fingerprinting system inspired by Shazam, for audio recognition and identification. It focuses on speed, efficiency and simplicity
A ledger implementation in PostgreSQL
A tool by AMD to run LLM Agents on Ryzen AI PCs in Minutes
Generative View Synthesis with Diffusion Models
a foundation model for SVG generation that transforms vectorization into a code generation task. Using a vision-language modeling architecture, StarVector processes both visual and textual inputs to produce high-quality SVG code with remarkable precision.
The slightly more awesome standard unix password manager for teams
an Apache-Licensed, secure, fast and easy to use Apache Iceberg REST Catalog written in Rust. Apache Iceberg is a project that allow us to run SQL query on a set of file(CSV, Parquet, JSON) directly from storage such as S3.
This package provides a simple way to generate unique, symmetric identicons based on an input string (e.g., an email address or username). It uses an MD5 hash to create a deterministic pattern and color scheme, then mirrors the design for a visually appealing avatar.
2025-03-25 20:19:00
Hi all,
Last week, NextJS has a new security vulnerability, CVE-2025-29927 that allow by pass middleware auth checking by setting a header to trick it into thinking this is an internal request and skip the auth middleware check. If you’re hosted on Vercel there is no action to take, but if you run the vercel server in your infra, you should update.
Another one for k8s, if you’re running ingress-nginx, you should update this patch. The attack require the ability to have a pod already running inside K8S network, such as sharing namespace with other users, or exposing admission controller webhook to internet. So if your cluster is dedicated to you, and not doing stuff like host network or expose admission controller service, you can buy sometime for the upgrade.
If you enjoy BetterDev, please spread the word by sharing it with your friends. And if you’d like to support my work, buying me a coffee would be much appreciated.
A classic tale of Linux horror. You’re SSH’d into a machine, you make one wrong move, and suddenly your system is broken. This post walks through how to recover from this self-inflicted nightmare.
RIGHT JOIN is an esoteric feature in the SQL language, and hardly ever seen in the real world, because almost every RIGHT JOIN can just be expressed as an equivalent LEFT JOIN. There is, however, one place in the SQL language where RIGHT JOIN is surprisingly ubiquitous and today we learn about it.
An approachable introduction to the magic of zero-knowledge proofs—how they let you prove something without revealing the details. Perfect for anyone curious about cryptography without diving into hardcore math.
This one’s a bit outside the usual programming realm, but trust me—it’s fascinating. A deep dive into how solar panels actually work, the engineering behind them, and why understanding electricity at this level is surprisingly useful.
Syncing data is one of those things that sounds easy until you try to build it. This post walks through a synchronization engine design that’s both simple and powerful.
A deep dive into how macOS can unintentionally leak sensitive data like passwords, thanks to clipboard behavior and debugging tools. A must-read for anyone who cares about security.
Ever tried putting text over an image and ended up with weird background overlaps? This post explains why that happens and how to fix it. If you do anything with CSS, you’ll want to bookmark this one.
BPF is like a superpower for peeking into Linux. Whether you care about performance monitoring, security, or just love cool system hacks, this is a fantastic read.
A nostalgic yet technical look at how null pointer dereferences have plagued macOS over the years. Great for those who love debugging deep OS issues.
AI-powered recommendations are everywhere, but how do they really work? This post explores how LLMs are changing search and recommendation engines for the better.
If you’re a Rubyist curious about parallelism, this is for you. A practical look at Ruby’s Ractors and how they enable truly parallel execution without locks.
A Game Boy emulator written in Rust.
A Rack web server written in Ruby from scratch.
an HTML5 Canvas JavaScript framework that extends the 2d context by enabling canvas interactivity for desktop and mobile applications.
Need to run untrusted code safely? This sandboxing tool might be your new best friend.
A physics engine in Go that makes simulating motion, collisions, and forces as simple as possible.
A blazing-fast plotting library for massive datasets, using modern GPU rendering to keep things smooth.
Parsing gigabytes of JSON per second. Zig port of simdjson with fundamental features.
A Model Context Protocol (MCP) server that provides browser automation capabilities using Playwright. This server enables LLMs to interact with web pages through structured accessibility snapshots, bypassing the need for screenshots or visually-tuned models.
Powerful devtools for Ruby on Rails. Inspired by the Laravel Debugbar.
an open source agent that monitors your database, finds root causes of issues, and suggests fixes and improvements. It’s like having a new SRE hire in your team, one with extensive experience in Postgres.
Free Online version of pgFormatter a PostgreSQL SQL syntax beautifier (no line limit here up to 100000 characters). This SQL formatter/beautifier supports keywords from SQL-92, SQL-99, SQL-2003, SQL-2008, SQL-2011 and PostgreSQL specifics keywords. May
A database schema management tool that works like Terraform—diff, apply, and keep your schema in check.
Define your API once in a simple tsp file, then generate OpenAPI, gRPC, client code, and docs automatically.
A fast, memory-safe web server powered by Rust. Similar to Caddy or Nginx but written in Rust.
