🛠️ All DevTools

[Testing] Show HN: Mock FedCM Integrations MockFedCM is a free FedCM Relying Party (RP) and Identity Provider (IdP) for testing FedCM integrations. Simulate real-world authentication flows, debug your implementation, and validate user experiences—all without needing a production IdP or RP.

[Other] Show HN: Mark 1.0, a notation that unifies JSON, HTML, JSX, XML, YAML, and more Author of Mark Notation here.<p>Mark is a unified notation for both object and markup data, combining the best of JSON, HTML, and XML with a clean syntax and succinct data model.<p>I&#x27;m glad to announce the 1.0 Release of Mark. This release is just the start of a long journey to make web a better platform to store and exchange data.<p>Your feedback welcome!

[DevOps] Fair-code workflow automation platform with native AI capabilities. Combine visual building with custom code, self-host or cloud, 400+ integrations.

[Monitoring/Observability] Agent for collecting, processing, aggregating, and writing metrics, logs, and other arbitrary data.

[Code Quality] Show HN: Fluent-state: a new fresh take on local React state Hi HN<p>I built *fluent-state*, a lightweight React hook that replaces useState, useReducer, useMemo, and useEffect.<p>It gives you:<p>- A fluent, proxy-based API: `state.user.name(&#x27;Joe&#x27;)` - Immutable updates without spread logic - Automatic dependency tracking - Built-in `compute` for reactive, memoized derived state (no useMemo needed) - Built-in `effect` for reactive side-effects with automatic dependency tracking (no useEffect needed) - Zero boilerplate, full control<p>Designed for local state, nested structures, and clean, declarative code.<p>Demo: <a href="https:&#x2F;&#x2F;stackblitz.com&#x2F;edit&#x2F;vitejs-vite-uh4kyzkf?file=src%2FApp.tsx" rel="nofollow">https:&#x2F;&#x2F;stackblitz.com&#x2F;edit&#x2F;vitejs-vite-uh4kyzkf?file=src%2F...</a> GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;marsbos&#x2F;fluent-state">https:&#x2F;&#x2F;github.com&#x2F;marsbos&#x2F;fluent-state</a> NPM: <a href="https:&#x2F;&#x2F;www.npmjs.com&#x2F;package&#x2F;fluent-state" rel="nofollow">https:&#x2F;&#x2F;www.npmjs.com&#x2F;package&#x2F;fluent-state</a><p>Try it out plz.

[Other] Show HN: UML is dead – so I'm building the tool to revive it Hi HN,<p>UML diagrams were meant to standardise system design, but they’ve become outdated — slow to build, hard to change, and rarely used in practice. Most tools feel clunky, and diagrams often go stale fast.<p>I’m building RapidChart, a tool to bring diagramming back to life — fast, flexible, and developer-first.<p>What makes it different:<p>Cursor-style interface for rapid diagram creation<p>Fully customisable and exportable<p>AI-assisted (works with GPT-4, Claude, etc.)<p>100% free<p>This began as part of my research at Imperial College London, and I’d really value your feedback.<p>Here’s the link: <a href="https:&#x2F;&#x2F;www.rapidcharts.ai" rel="nofollow">https:&#x2F;&#x2F;www.rapidcharts.ai</a><p>Thanks!

[Other] The ultimate UI kit for Go & templ developers templUI Pro builds on templUI — the open source UI kit for Go & templ. 200+ premium UI blocks, ready to copy & paste. No frontend frameworks, no build tools — just Go, Vanilla JS, HTML & Tailwind.

[Other] Online Text Tools to Improve Work Efficiency Free online tools for text processing, case and format conversion. All tools run locally in your browser for privacy. No downloads needed.

[Other] Online coding platform with collaborative problem solving AlgoRux is a coding platform for C, C++, Python, PHP & JavaScript. Practice daily problems, join weekly contests, and collaborate in real time with friends. Perfect for learners, interview prep, and competitive programmers. Try it at algorux.com!

[Other] Trusted, Ready to Use Enterprise IoT Server AtomIoT is an enterprise IoT server to connect, monitor & manage smart devices via LoRaWAN, MQTT, or HTTP. With logs, FOTA, alerts & digital twins. Ideal for companies and customers that make hardware. Get devices online in minutes.

[Other] Logical implication is a comparison operator

[Other] Show HN: Object database for LLMs that persists across chats (MCP server) I’d like to use LLMs for remembering all kinds of things: fitness, to-do lists, contacts, bug reports, research links, whatever. But there is no way to do that now.<p>For example, if I find a great coding tutorial in chat, or tell it how much I ran yesterday, it forgets that when I close the chat. Even if I keep the chat history, I still need to scour through lots of messages to find the data I want. Ideally, Claude would remember all this, and I’d be able to find it later with ease. This is what my team built.<p>It is a collaborative database you add to any LLM that supports MCP. (Claude Code, Desktop, and Pro for now; ChatGPT will soon). You can add, update, and search for items in the database inside chat. You can easily create your own object schemas. There is an automatically generated web UI for using the database. It generates maps, charts, calendars, tables, lists, and other UI elements. You can share or publish the database as well.<p>Over time, we want to make this database powerful enough to make our lives much simpler by letting LLMs replace a bunch of the apps and software services we use daily.

[Other] Run TypeScript code without worrying about configuration

[Other] Show HN: Conductor, a Mac app that lets you run a bunch of Claude Codes at once

[Other] Show HN: kiln – Git-native, decentralized secret management using age Hi HN, I&#x27;ve been building this tool for the past couple of weeks to solve a problem that seems universal across development teams: sharing environment variables securely.<p>You know the drill - someone needs the staging database URL, so it gets shared over chat. Production API keys end up in plaintext files. Or you set up some complex secret management system that becomes a single point of failure during critical deployments.<p>At Zerodha, we&#x27;re a stock broker with strict regulatory requirements. Our infrastructure needs to be auditable, and our data must stay with us for instant recovery. But the deeper issue was that every solution we tried made deployments dependent on external services.<p>We tried GitLab CI&#x27;s built-in secrets, but they&#x27;re stored unencrypted and only repository maintainers can access them. HashiCorp Vault was too complex to manage with painful ACL setup, plus it&#x27;s now crippled by their BSL license change. AWS Secrets Manager would create the vendor lock-in we wanted to avoid.<p>The breaking point came when we wanted to manage secrets through Terraform for idempotency and better infrastructure-as-code practices. But Terraform has no built-in way to encrypt secrets without relying on external providers. We could either store secrets in plaintext in our Terraform configs or add yet another external dependency to our deployment pipeline.<p>That&#x27;s when I had the idea: what if we could inject encrypted environment variables directly into Terraform, so anyone with the right key could deploy without hunting down secrets from different systems? As I iterated through this idea, I realized the same pattern would work for any application - from personal projects to team deployments.<p>So I built kiln. It encrypts environment variables using age encryption into files that live alongside your code. No servers, no network calls, no external dependencies. Each team member gets their own key, and you control access per environment.<p>Here&#x27;s how it works:<p><pre><code> # Generate a new age key, or use your existing SSH keys kiln init key # Initialize with your team&#x27;s public keys kiln init config --recipients &quot;alice=$(curl https:&#x2F;&#x2F;gitlab.company&#x2F;alice.keys)&quot; --recipients &quot;me=$(cat ~&#x2F;.ssh&#x2F;id_ed25519.pub)&quot; # Set secrets (prompts securely, never shows in terminal) kiln set DATABASE_URL kiln set API_KEY # Run your app with decrypted environment kiln run npm start # These encrypted files are safe to commit git add .kiln.env kiln.toml </code></pre> Why not SOPS? SOPS is great for general file encryption, but kiln is built specifically for the environment variable workflow. It has commands like &quot;run&quot;, &quot;export&quot;, and built-in team management. Think &quot;SOPS for .env files&quot; with a focus on developer UX.<p>Why not raw age encryption? Age is perfect for the crypto layer, but terrible for day-to-day team workflows. Try managing 20 team members across 5 environments with raw age commands - you&#x27;ll go insane. kiln handles the orchestration.<p>As for technical details, kiln:<p>- Uses age encryption (modern, audited, simple)<p>- Works with existing SSH keys or generates new age keys<p>- Role-based access via TOML configuration<p>- Single, cross-platform Go binary<p>- Zero network dependencies - everything works offline<p>- MIT licensed<p>The game-changer: secrets travel with code. No more &quot;can someone send me the staging secrets?&quot; in chat. No more broken deploys because the secret service is down. No more hoping your vendor doesn&#x27;t change their pricing or licensing.<p>Try it out - I&#x27;m confident it&#x27;ll help improve your team&#x27;s deployment workflows. Feel free to ask me any questions!<p>GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;thunderbottom&#x2F;kiln">https:&#x2F;&#x2F;github.com&#x2F;thunderbottom&#x2F;kiln</a><p>Docs: <a href="https:&#x2F;&#x2F;kiln.sh" rel="nofollow">https:&#x2F;&#x2F;kiln.sh</a><p>Or install now: go install github.com&#x2F;thunderbottom&#x2F;kiln@latest

[Other] API Documentation Browser

[DevOps] WasmEdge is a lightweight, high-performance, and extensible WebAssembly runtime for cloud native, edge, and decentralized applications. It powers serverless apps, embedded functions, microservices, smart contracts, and IoT devices.

[Testing] Find secrets with Gitleaks 🔑

[Other] Show HN: Easy alternative to giflib – header-only decoder in C Hi HN, I made a lightweight, header-only GIF decoder in C, inspired by stb-style libraries. No dynamic allocation, portable, and optimized for embedded devices.<p>GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;Ferki-git-creator&#x2F;TurboStitchGIF-HeaderOnly-Fast-ZeroAllocation-PlatformIndependent-Embedded-C-GIF-Decoder">https:&#x2F;&#x2F;github.com&#x2F;Ferki-git-creator&#x2F;TurboStitchGIF-HeaderOn...</a><p>Would love feedback or suggestions.

[Other] Parsing Protobuf like never before See also <a href="https:&#x2F;&#x2F;buf.build&#x2F;blog&#x2F;hyperpb" rel="nofollow">https:&#x2F;&#x2F;buf.build&#x2F;blog&#x2F;hyperpb</a> (via <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=44661785">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=44661785</a>)