Show HN: Helix – AI-powered API mocking with strict schema enforcement https://ift.tt/Ej06ukA

Show HN: Helix – AI-powered API mocking with strict schema enforcement Helix is a dynamic mock server that generates data on the fly using LLMs (supports Ollama, DeepSeek, Groq). Key difference from other AI generators: Schema Enforcement. One of the biggest issues with LLMs is non-deterministic output. To solve this, Helix allows you to provide a "System Schema" (using TypeScript interfaces, JSON Schema, or plain text rules). The engine ensures the generated JSON strictly adheres to your defined keys and types, while still generating realistic values for the content. Features: - Local-First: Works completely offline with Ollama (Llama 3.2 is recommended). - Schema Safety: You can force strict structure compliance so your frontend doesn't break. - Chaos Mode: Optionally simulate latency and error rates. - Stack: Python 3.11, FastAPI, Redis, Docker. It's open source (AGPLv3). I'd love to hear your feedback, especially regarding the schema validation approach! Repo: https://ift.tt/nFemi5o https://ift.tt/nFemi5o December 19, 2025 at 05:28AM

Show HN: MephistoMail – RAM-only ephemeral email with client-side privacy tools https://ift.tt/U2kzHoN

Show HN: MephistoMail – RAM-only ephemeral email with client-side privacy tools Hi HN, I’m building MephistoMail, a privacy-focused disposable email service designed to decouple digital identity from online services. After seeing how many "temp mail" providers log IP addresses or sell metadata, I wanted to build something that prioritizes total digital hygiene. New Key Features: Volatile Memory Storage: We use a RAM-only infrastructure. No incoming messages or session data are ever written to a physical HDD. Once the session terminates, the data is cryptographically wiped. Client-Side Password Generator: Integrated entropy-based generator that runs locally in your browser. Create high-security passwords for your registrations without them ever touching our servers. Secure QR Handoff: Transfer your active "burner" session from desktop to mobile instantly via an encrypted QR link. No need to type complex random addresses on your phone. Multi-Account Tunneling: Manage multiple anonymous identities simultaneously through a unified interface. Custom Alias Creation: Define your own usernames on our secure domains for more professional-looking temporary identities. The Stack: Frontend: React, Tailwind CSS, Lucide icons. Backend Logic: Powered by Mail.tm's stable API for zero-latency delivery. Privacy: Strict No-Logs policy, TLS 1.3 encryption, and no tracking cookies. I’m looking for technical feedback on the UX and the "Persona" tool integration. URL: https://www.mephistomail.site/ Source: https://ift.tt/1Ka8fdO Happy to answer any questions about the implementation! https://www.mephistomail.site/ December 19, 2025 at 12:45AM

Show HN: Daily Set Puzzle – I rebuilt it after setgame.com's SSL cert expired https://ift.tt/jf1K7Mr

Show HN: Daily Set Puzzle – I rebuilt it after setgame.com's SSL cert expired https://ift.tt/rZLHsuw December 18, 2025 at 11:36PM

Show HN: SourceMinder, a Context Aware Code Search for Solo Devs and Claude Code https://ift.tt/0SvGmZx

Show HN: SourceMinder, a Context Aware Code Search for Solo Devs and Claude Code Hello HN. Here's the TLDR from the linked blog post: After running into context window issues on my first two projects, I developed a tool for making Claude Code use fewer tokens by creating an indexer that provides context in the search results. Built with sqlite and tree-sitter, it currently supports the following languages: C, Go, PHP, Python, and TypeScript. Get the code here: https://ift.tt/jsGtkXh Happy to answer any questions about it here, and open to critical feedback. Thanks! https://ift.tt/YC5J08k December 18, 2025 at 12:08AM

Show HN: MDXport – Browser-Based Markdown to PDF Using Typst and WASM https://ift.tt/flMnuxj

Show HN: MDXport – Browser-Based Markdown to PDF Using Typst and WASM Hi HN, I built this because I was frustrated with existing Markdown-to-PDF converters. Most of them rely on HTML/CSS (puppeteer) which often messes up pagination and tables, or they require uploading data to a server (privacy concerns). MDXport is a purely client-side tool. The Stack: - Core: Typst (a modern LaTeX alternative) compiled to WebAssembly. - Privacy: Zero data leaves your browser. All rendering happens locally via WASM. - Feature: It handles page breaks and complex tables much better than standard CSS print drivers. I also added some heuristics to automatically fix common formatting errors from LLM generated markdown (e.g., broken nested lists or overflowing tables). It's currently an MVP. No sign-up required, free to use. I'd love to hear your feedback on the rendering quality compared to Pandoc/LaTeX. Link: https://www.mdxport.com https://ift.tt/X0Jhx2m December 17, 2025 at 08:46PM

Show HN: Mephisto – A RAM-only, ad-free disposable email PWA built with React https://ift.tt/9xPcqsf

Show HN: Mephisto – A RAM-only, ad-free disposable email PWA built with React Hi HN, I built Mephisto because I was frustrated with the current state of disposable email services—most are riddled with intrusive ads, trackers, and captchas. I wanted a tool that felt like a proper developer utility rather than a spam farm. The stack is React, Vite, and Tailwind. Key architectural decisions: 1. Volatile Memory: The backend writes nothing to disk. Once a session terminates, the data is irretrievable. 2. Client-Side Entropy: The password generator runs locally in the browser; keys are never sent to the server. 3. PWA: It's installable and designed for low latency using WebSockets for incoming mail (no polling). 4. Mobile Handoff: You can transfer an active session to mobile via an encrypted QR code. It is completely free and open for public use. I'd love to hear your feedback on the implementation and UI. https://mephistomail.site December 17, 2025 at 06:54AM

Show HN: I built middleware to connect legacy SOAP APIs to AI agents in 2 weeks https://ift.tt/zGoby1c

Show HN: I built middleware to connect legacy SOAP APIs to AI agents in 2 weeks After 6 months integrating AI voice agents with old systems, I got tired of fighting SOAP from 2003. Built Hopeless to turn 6-month integrations into 2 weeks. ~70% token reduction. Works with any legacy system. https://ift.tt/JnjhCpM December 17, 2025 at 05:39AM