Latest posts
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How I Deployed a Node.js App on a Cheap VPS with Nginx, HTTPS, and PM2 (Part 1: Server Setup)
Deploy a Node.js App on a Cheap VPS: Server Setup (Part 1) | SpiritCode” meta_description: Managed hosting is convenient, but the bill adds up fast once you have a few small projects. I moved one of my Node.js apps to a low-cost VPS, and I want to show you exactly how I did it, step…
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How I Automated Sales Tax Reports by State With Python and pandas
Learn how to turn a Shopify, Stripe or Square export into a monthly sales tax report by state, with an economic nexus check, using Python and pandas. Full code included. If you sell online to customers across the US, you already know the pain: every month you need to know how much you sold and…
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i Automated Invoice Follow-Ups for a Small US Business With Python (and Saved 6 Hours a Week)
Step-by-step Python script that sends invoice reminders automatically via Gmail: before the due date, on the due date, and when payments are late. Full code included. tags: [python, automation, small business, invoices, smtp] I Automated Invoice Follow-Ups for a Small US Business With Python (and Saved 6 Hours a Week) I was helping a small…
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How I Automated a Weekly Sales Report From a CSV With Python (and Emailed It to the Client)
A small US business kept building a weekly sales report by hand in Excel. Here’s how I automated it with Python and pandas and emailed it with Gmail’s SMTP. A small business owner I work with was spending about 30 minutes every Monday opening a CSV export from their sales system, summing columns in Excel,…
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How I Deployed a Node.js App on a Cheap VPS With Nginx, PM2, and Free SSL
I moved a Node.js app from my laptop to a low-cost Ubuntu VPS. Here’s exactly how I set up Nginx, PM2, and a free Let’s Encrypt SSL certificate. I had a small Node.js app running on localhost:3000 and needed it online at a real domain, with HTTPS, for a US client. Managed platforms are convenient,…
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How to Get Reliable Internet on a Farm in Rural Montana Without Cable
If you live on a farm or ranch in rural Montana, you already know the cable company isn’t coming. I’ve heard “we don’t service that area” so many times I could set it as my ringtone. The good news? You don’t need cable anymore. You can get internet that’s fast enough for video calls, streaming,…
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How to Get Reliable Internet on a Farm in Rural Montana Without Cable
If you live on a farm or ranch in rural Montana, you already know the cable company isn’t coming. I’ve heard “we don’t service that area” so many times I could set it as my ringtone. The good news? You don’t need cable anymore. You can get internet that’s fast enough for video calls, streaming,…
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Fixing NoClassDefFoundError: org/apache/http/conn/ssl/SSLConnectionSocketFactory in Spring Boot 3
You migrate to Spring Boot 3.2, maybe add spring-boot-starter-webflux along the way, and at runtime you get this: It’s easy to blame the new starter, but WebFlux is almost never the cause. Here’s what the error actually means and how to fix it. What the error means The package name tells you everything: Spring Boot…
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Fixing “Cannot read properties of undefined (reading ‘style’)” in SvelteKit
This error looks scary, but in SvelteKit it almost always comes down to one thing: your code touched a DOM element that wasn’t there yet. Here’s how to tell which case you’re in and how to fix it. One note first: if this started right after you upgraded @sveltejs/adapter-node, the adapter probably isn’t the cause.…
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Why does Next.js 14 fail to parse my multipart/form-data upload, and how do I test it with Burp Suite?
File uploads look simple until one request refuses to parse. The browser sends the file, the route handler receives it, and then request.formData() throws something like this: Nothing in the message points at the real cause. In most cases I’ve seen, the culprit is a single line in the client code: a hand-written Content-Type header…
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Why does Django 5 raise “ValueError: chunk_size must be provided when using QuerySet.iterator() after prefetch_related()”?
This error tends to show up right after a Django 5 upgrade. A batch job that has run quietly for years, usually a report, an export, or a data backfill, suddenly fails on its first line of iteration. The code did not change. The Django version did. The message is accurate, but it does not…
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Fix Angular 17 Ivy Error “Cannot read property ‘ɵɵdefineInjectable’ of undefined” after TS 5.5 Upgrade
descricao: “Learn how to resolve the Angular 17 Ivy compilation error caused by TypeScript 5.5 incompatibility. Step‑by‑step fix and best practices.” # Angular 17 Ivy compilation error “Cannot read property ‘ɵɵdefineInjectable’ of undefined” after upgrading to TypeScript 5.5 I was in the middle of a sprint when our team decided to bump the monorepo’s TypeScript…
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Why Vault Token Renewal Stops After 24h with Kubernetes Auth v2.5.1
descricao: Learn why HashiCorp Vault token renewal halts after 24 hours using the Kubernetes auth method v2.5.1 and how to fix it. # Why does HashiCorp Vault token renewal stop after 24h when using Kubernetes auth method version 2.5.1 I was knee‑deep in a production rollout of a multi‑tenant service when our monitoring started screaming:…
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Why AWS WAF Shows “blocked: 403 – Missing required header” for API Gateway with Lambda Authorizer v2
descricao: “Learn why AWS WAF returns “blocked: 403 – Missing required header” when API Gateway uses Lambda authorizer v2 and how to correctly return the X‑Amzn‑Trace‑Id header.” # Why does AWS WAF log show “blocked: 403 – Missing required header” for API Gateway when using Lambda authorizer v2 I was in the middle of a…
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Spring Boot 3.2 CSRF Token ‘null’ with Thymeleaf Fragments & Angula
descricao: “Fix Spring Boot 3.2 CSRF validation error “Invalid CSRF Token ‘null’ supplied” when using Thymeleaf fragments and an Angular HttpClient interceptor.” # Spring Boot 3.2 fails CSRF validation with “Invalid CSRF Token ‘null’ supplied” when using Thymeleaf fragments and Angular frontend I ran into a nasty CSRF mismatch bug last month while rolling out…
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Why Terraform plan shows Provider version constraints must be a string
descricao: “Learn why Terraform 1.7 shows “Error: Provider version constraints must be a string” after adding version 5.0.0 and how to fix it.” # Why does Terraform plan show “Error: Provider version constraints must be a string” after adding provider version 5.0.0 I was in the middle of a quarterly upgrade cycle for a large…
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Fixing TypeError: Cannot read property ‘client’ of undefined in NestJS with Redis Transport
descricao: “Learn how to fix the TypeError ‘Cannot read property client of undefined’ in NestJS microservices after upgrading to ioredis 5.4. Step‑by‑step guide with code examples.” # Fixing “TypeError: Cannot read property ‘client’ of undefined” in NestJS microservice when using Redis Transport with ioredis 5.4 I ran into the dreaded `TypeError: Cannot read property ‘client’…
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MongoDB Atlas Change Stream Stops After Replica Set Step‑Down in Kubernetes
descricao: “Learn how to keep MongoDB Atlas change streams alive during primary elections in a Kubernetes StatefulSet deployment.” # MongoDB Atlas Change Stream Stops After Replica Set Step‑Down in Kubernetes StatefulSet I ran into a nasty production‑grade bug last quarter: my microservice, running inside a Kubernetes StatefulSet, would lose its MongoDB Atlas change stream every…
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Why Cloudflare Turnstile Returns error_code=1000 Behind Nginx HTTP/2
descricao: “Learn why Cloudflare Turnstile shows error_code=1000 when run behind an Nginx reverse proxy with HTTP/2 and how to fix it.” # Why does Cloudflare Turnstile return “error_code=1000” when deployed behind an Nginx reverse proxy with HTTP/2 I first ran into the dreaded `error_code=1000` when I tried to protect a legacy admin panel with Cloudflare…
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Resolving “Failed to fetch” CORS error with SameSite=None cookies in Safari 17
Learn how to fix the Failed to fetch” CORS error in Safari 17 when using fetch API with SameSite=None cookies by configuring Set-Cookie headers and ITP. # Resolving “Failed to fetch” CORS error when using fetch API with SameSite=None cookies in Safari 17 I hit this exact wall last month while rolling out a cross‑origin…
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Docker container scans report false positive CVE‑2024‑XXXX on Alpine 3.20 despite patching
descricao: “Learn how to configure Trivy and Snyk ignore rules to silence false positive CVE‑2024‑XXXX alerts on Alpine 3.20 Docker images.” I was in the middle of a production rollout for a Go microservice that ships in an Alpine 3.20 base image. The CI pipeline runs Trivy and Snyk on every build, and both tools started…
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Fix “Signature verification failed” in AWS SNS .NET 8 Lambda
descricao: “Learn how to fix Signature verification failed errors in .NET 8 Lambda when validating AWS SNS messages caused by certificate chain issues.” # Fixing “Signature verification failed” when validating AWS SNS messages in .NET 8 Lambda I was knee‑deep in a production incident last month when my .NET 8 Lambda started throwing `Signature verification…
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Fix React 18 useTransition Infinite Loop After Lazy Loading
descricao: “Learn how to diagnose and fix the ‘Maximum update depth exceeded’ error when using React 18 useTransition with React.lazy loaded components.” I hit this bug in production last month while rolling out a new code‑splitting strategy for a high‑traffic dashboard. I was swapping a useTransition‑wrapped state update with a React.lazy‑loaded detail view, and suddenly…
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Fix SvelteKit navigation error after lazy‑loaded store
descricao: “Learn how to fix the “Uncaught (in promise) TypeError: Cannot read properties of undefined (reading ‘push’)” error caused by a dynamically imported store in SvelteKit.” I ran into a weird crash in a production SvelteKit app that was using lazy‑loaded stores for feature flags. The moment a component tried to navigate with $app/navigation –…
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Why does AWS WAF block legitimate POST requests with “403 Forbidden” after adding a size constraint on the body for JSON payloads?
descricao: “Learn why AWS WAF returns 403 on valid JSON POSTs after adding a size constraint, and how to fix false positives.” I was knee‑deep in a production rollout for a new API endpoint when our monitoring started screaming 403 Forbidden on perfectly valid POSTs. The only change we’d made a few minutes earlier was…
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GitLab CI job hangs at “Running after_script” when Docker‑in‑Docker uses overlay2 on GitLab Runner 15.9
descricao: “Learn how to fix GitLab CI jobs hanging at “Running after_script” when using Docker‑in‑Docker with overlay2 on Runner 15.9. Step‑by‑step guide and FAQs.” I was in the middle of a release sprint when our CI pipeline started stalling at the very end of a job – the Running after_script line never completed. The job…
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GitHub Actions runner hangs with Docker BuildKit on macOS Ventura
descricao: “Learn why GitHub Actions runners freeze on macOS Ventura 13.4 when Docker BuildKit is enabled and how to fix the deadlock.” I hit this exact scenario last month while trying to speed up container builds in a private repo. My workflow was simple: spin up a macos-13 runner, install Docker Desktop (the default version…
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titulo_seo: “GitHub Actions runner hangs with Docker BuildKit on macOS Ventura”meta_descricao: “Learn why GitHub Actions runners freeze on macOS Ventura 13.4 when Docker BuildKit is enabled and how to fix the deadlock.”palavra_chave_foco: “GitHub Actions runner hangs when using Docker BuildKit on macOS Ventura 13.4”slug: “github-actions-runner-hangs-docker-buildkit-macos-ventura-13-4” tags: [“github-actions”, “docker”, “buildkit”, “macos”, “ci”] GitHub Actions runner hangs…
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Helm upgrade fails with “cannot re-use a name that is still in use” on AKS 1.29
descricao: “Learn why Helm 3.14 on AKS 1.29 throws “cannot re-use a name that is still in use” and how to fix release name collisions caused by stricter CRD handling.” I hit this exact error last month while trying to push a minor chart bump through our CI pipeline on an Azure Kubernetes Service (AKS)…
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Stop “ResizeObserver loop limit exceeded” in SvelteKit 2.0
descricao: “Learn the exact fix for the ResizeObserver loop limit exceeded error caused by Vite’s experimental prebundle in SvelteKit 2.0 projects.” I ran into a nasty ResizeObserver loop limit exceeded error the moment I turned on Vite’s experimental prebundle flag in a brand‑new SvelteKit 2.0 app. The console exploded, the UI flickered, and my dev server…
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How to configure GitHub Actions to cache npm dependencies for Node.js 20 on self‑hosted Windows runners
Learn how to set up reliable npm caching in GitHub Actions on self‑hosted Windows runners using Node.js 20. Step‑by‑step guide with code. I was in the middle of a release sprint when our CI started taking 15‑20 minutes just to install npm packages on a self‑hosted Windows runner. The pipeline used Node.js 20, the runner was…
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How to fix “permission denied” when a Kubernetes initContainer tries to chmod /var/run/secrets/kubernetes.io/serviceaccount on EKS pods with runAsUser 1000
Learn how to resolve permission denied errors when an initContainer on EKS tries to chmod the serviceaccount token file while using runAsUser 1000. I was debugging a flaky CI/CD job that spun up an EKS pod, ran an initContainer that needed to tweak the service‑account token file permissions, and then crashed with a classic permission…
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Why does Django 5.0 raise ‘RuntimeError: coroutine not awaited’ when using async ORM inside a Celery task
Learn why Django 5.0 throws RuntimeError: coroutine not awaited when using async ORM inside a Celery task and how to fix it. I hit this exact error in production last month: a Celery worker tried to save a model with Django 5.0’s new async ORM and exploded with The stack trace pointed at my save() call…
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What causes “Permission denied (publickey)” for GitHub Actions when using deploy keys generated with ssh-keygen -t ed25519 -a 100?
Diagnose and fix “Permission denied (publickey)” errors in GitHub Actions when using high‑iteration ed25519 deploy keys generated with ssh-keygen -t ed25519 -a 100 I ran into a maddening “Permission denied (publickey)” error in a CI workflow that was supposed to push a built artifact back to a private repo. The only thing that looked different…
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Failed to verify JWT signature: key ID not found – Auth0 RSA256 daily rotation
Learn why Auth0 throws “Failed to verify JWT signature: key ID not found” after daily RSA256 key rotation and how to fix it. I was knee‑deep in a production rollout when the logs started screaming “Failed to verify JWT signature: key ID not found”. The only thing that had changed was that our Auth0 tenant…
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Hardening Node.js Applications Against Dependency Vulnerabilities Using Snyk and npm Audit
Learn to secure your Node.js applications from dependency vulnerabilities using Snyk and npm audit for better security As a Node.js developer, I’ve encountered my fair share of security issues, particularly when it comes to dependency vulnerabilities. It’s a problem that can sneak up on you, even with the most rigorous testing and code reviews. In…
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Django 4.1 Redis 7 Connection Fix
Solving ‘Cannot Connect to Redis Server’ error in Django 4.1 with Redis 7, step-by-step guide to resolving Redis connection issues I’ve recently encountered the dreaded ‘Cannot Connect to Redis Server’ error while working on a Django 4.1 project that utilizes Redis 7 as its cache backend. This issue can be frustrating, especially when you’re on…
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Securing GraphQL API with Apollo Server and JWT
Learn how to secure a GraphQL API with Apollo Server 3.6.2 and JSON Web Tokens (JWT) in a Node.js 18.12.1 application # Securing a GraphQL API with Apollo Server 3.6.2 and authentication using JSON Web Tokens (JWT) in a Node.js 18.12.1 Application I recently had to secure a GraphQL API with Apollo Server and authentication…
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React Accessibility for Visually Impaired
Learn how to implement accessibility features in a React 18.2.0 application for visually impaired users using ARIA attributes # Implementing Accessibility Features for Visually Impaired Users in a React 18.2.0 Application Using ARIA Attributes As a frontend developer, I’ve worked on several projects where accessibility was an afterthought. However, I recently had the opportunity to…
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Troubleshooting Vue.js Rendering Issues
Diagnose and resolve Vue.js rendering issues caused by third-party library conflicts with practical steps and code examples # Troubleshooting Vue.js Rendering Issues Caused by Third-Party Library Conflicts I’ve been working with Vue.js for a while now, and one of the most frustrating issues I’ve encountered is when my application’s rendering gets messed up due to…
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GDPR Compliance in Node.js
Learn how to ensure GDPR compliance in Node.js applications using privacy-enhancing technologies # Complying with GDPR Regulations in Node.js Applications Using Privacy-Enhancing Technologies As a senior software engineer, I’ve recently found myself dealing with the complex task of ensuring GDPR compliance in our company’s Node.js applications. The General Data Protection Regulation (GDPR) is a comprehensive…
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Slow API Response Times in Express.js? Here’s My Fix
Description: Struggling with slow API response times in Express.js? I share the exact diagnostic process and fixes that worked for me in production — from queries to caching Why Your Express.js API Is Slow (And the Exact Steps I Took to Fix It) The first time I got paged for a slow endpoint in production,…
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Next.js Env Variables Not Loading? Here’s the Fix (2025)
Meta Description: Environment variables not loading in Next.js? I break down every common cause — from NEXT_PUBLIC_ prefixes to restart issues — with real fixes that worked for me. Why Your Environment Variables Aren’t Loading in Next.js (And How I Fixed It Every Time) The first time this happened to me, I spent almost an…
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Optimizing MongoDB Query Performance in Node.js
Improve MongoDB query speed in Node.js applications using indexing and caching strategies for better performance # Optimizing MongoDB Query Performance in Node.js 14 using Indexing and Caching I’ve recently worked on a Node.js project that relied heavily on MongoDB for data storage. As the dataset grew, we started noticing significant slowdowns in query performance. After…
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Protecting Vue.js against XSS
Learn how to prevent cross-site scripting attacks in Vue.js 2.6 using DOMPurify to sanitize user input # Protecting against cross-site scripting attacks in Vue.js 2.6 using DOMPurify I’ve worked on several Vue.js projects where security was a top priority. One of the common issues we faced was protecting against cross-site scripting (XSS) attacks. In this…
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Migrating Legacy Monoliths to AWS Serverless Architecture: What I Learned the Hard Way
Meta Description: I’ve migrated three legacy monoliths to AWS serverless. Here’s my real step-by-step process, the mistakes I made, and what I’d do differently. The first time I was handed a “simple serverless migration,” it was anything but simple. The application was a 12-year-old Java monolith running on EC2, with a single relational database, cron…
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Optimizing Docker Image Size for Python Microservices: How I Went From 1.2GB to Under 90MB
Meta Description: I cut my Python microservice images from 1.2GB to under 90MB. Here’s my exact process for optimizing Docker image size without breaking builds. The first time I shipped a Python microservice to production, I didn’t think twice about image size. I wrote a simple Dockerfile, pulled the default python:3.11 base image, installed my…
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Fixing Docker Permission Denied Errors on Ubuntu (The Complete Guide)
Meta Description: I hit the Docker permission denied error more times than I’d like to admit. Here’s every fix I’ve used on Ubuntu, from quick patches to root causes. The first time I saw permission denied while trying to connect to the Docker daemon socket, I did what most people do — I just typed…
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How to Avoid Rate Limits in Node.js Apps (Without Breaking Your Users)
Meta Description: Learn how I stopped hitting rate limits in production Node.js apps using throttling, queuing, caching, and smart retry strategies that actually work. I still remember the first time a production Node.js service I built got completely throttled by a third-party API in the middle of a traffic spike. Every outgoing request started returning…
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Why Your CSS Grid Breaks Only on iPhone: Fixing Layout Overlap in Mobile Safari
Meta Description: Debug CSS Grid layout overlap bugs in mobile Safari with real fixes for implicit rows, minmax, flex-basis conflicts, and viewport units. Introduction The first time I saw it, I genuinely thought I was losing my mind. A three-column CSS Grid layout that looked flawless in Chrome DevTools’ device emulator, tested clean in Firefox…