I want to build a single-page developer tools website with: JSON formatter/validator, hash generator (MD5/SHA), regex tester, base64 encoder/decoder, color converter, and timestamp converter. It needs to be fast, SEO-friendly, and easy to deploy on a $5 VPS. Recommend a minimal tech stack. I want to build a single-page developer tools website with: JSON formatter/validator, hash generator (MD5/SHA), regex tester, base64 encoder/decoder, color converter, and timestamp converter. It needs to be fast, SEO-friendly, and easy to deploy on a $5 VPS. Recommend a minimal tech stack. I want to build a single-page developer tools website with: JSON formatter/validator, hash generator (MD5/SHA), regex tester, base64 encoder/decoder, color converter, and timestamp converter. It needs to be fast, SEO-friendly, and easy to deploy on a $5 VPS. Recommend a minimal tech stack. Create a FastAPI project structure for a developer tools website. Include: - app.py with FastAPI setup - templates/index.html with Jinja2 - static/css/style.css - static/js/app.js Mount static files, set up template engine. Include a basic responsive layout with a sidebar for tool navigation and a main content area. Create a FastAPI project structure for a developer tools website. Include: - app.py with FastAPI setup - templates/index.html with Jinja2 - static/css/style.css - static/js/app.js Mount static files, set up template engine. Include a basic responsive layout with a sidebar for tool navigation and a main content area. Create a FastAPI project structure for a developer tools website. Include: - app.py with FastAPI setup - templates/index.html with Jinja2 - static/css/style.css - static/js/app.js Mount static files, set up template engine. Include a basic responsive layout with a sidebar for tool navigation and a main content area. Add a JSON formatter endpoint to my FastAPI app. It should: 1. Accept POST /api/json/format with form data 2. Parse JSON and return prettified version (indent=2) 3. Return error with line/column number if invalid 4. Also add /api/json/minify and /api/json/validate endpoints Add a JSON formatter endpoint to my FastAPI app. It should: 1. Accept POST /api/json/format with form data 2. Parse JSON and return prettified version (indent=2) 3. Return error with line/column number if invalid 4. Also add /api/json/minify and /api/json/validate endpoints Add a JSON formatter endpoint to my FastAPI app. It should: 1. Accept POST /api/json/format with form data 2. Parse JSON and return prettified version (indent=2) 3. Return error with line/column number if invalid 4. Also add /api/json/minify and /api/json/validate endpoints Add hash generation endpoints: POST /api/hash/generate Accept text input and comma-separated algorithm list (md5, sha1, sha256, sha512). Return all hashes as JSON. Use Python's hashlib. Add hash generation endpoints: POST /api/hash/generate Accept text input and comma-separated algorithm list (md5, sha1, sha256, sha512). Return all hashes as JSON. Use Python's hashlib. Add hash generation endpoints: POST /api/hash/generate Accept text input and comma-separated algorithm list (md5, sha1, sha256, sha512). Return all hashes as JSON. Use Python's hashlib. Add POST /api/regex/test that accepts a pattern, test string, and flags. Return all matches with their positions, groups, and named groups. Handle regex errors gracefully. Support flags: ignorecase, multiline, dotall. Add POST /api/regex/test that accepts a pattern, test string, and flags. Return all matches with their positions, groups, and named groups. Handle regex errors gracefully. Support flags: ignorecase, multiline, dotall. Add POST /api/regex/test that accepts a pattern, test string, and flags. Return all matches with their positions, groups, and named groups. Handle regex errors gracefully. Support flags: ignorecase, multiline, dotall. Add /api/base64/encode and /api/base64/decode endpoints. Handle both text and URL-safe base64. Detect auto if text contains URL-unsafe chars. Add /api/base64/encode and /api/base64/decode endpoints. Handle both text and URL-safe base64. Detect auto if text contains URL-unsafe chars. Add /api/base64/encode and /api/base64/decode endpoints. Handle both text and URL-safe base64. Detect auto if text contains URL-unsafe chars. Add /api/color/convert endpoint. Accept a color in any format (hex, rgb, hsl, named color). Return the color in all formats: hex, rgb, hsl, plus a complementary color and contrast check (#000 and #fff). Add /api/color/convert endpoint. Accept a color in any format (hex, rgb, hsl, named color). Return the color in all formats: hex, rgb, hsl, plus a complementary color and contrast check (#000 and #fff). Add /api/color/convert endpoint. Accept a color in any format (hex, rgb, hsl, named color). Return the color in all formats: hex, rgb, hsl, plus a complementary color and contrast check (#000 and #fff). Add /api/timestamp/convert endpoint. Accept either a Unix timestamp or human date string. Return: Unix timestamp, ISO 8601, relative time ("3 hours ago"), and date in multiple timezones. Add /api/timestamp/convert endpoint. Accept either a Unix timestamp or human date string. Return: Unix timestamp, ISO 8601, relative time ("3 hours ago"), and date in multiple timezones. Add /api/timestamp/convert endpoint. Accept either a Unix timestamp or human date string. Return: Unix timestamp, ISO 8601, relative time ("3 hours ago"), and date in multiple timezones. <div hx-post="/api/json/format" hx-target="#result" hx-swap="innerHTML" hx-indicator="#spinner"> <textarea name="input_text" placeholder="Paste your JSON here..."></textarea> <button type="submit">Format</button> </div> <div id="result"></div> <div hx-post="/api/json/format" hx-target="#result" hx-swap="innerHTML" hx-indicator="#spinner"> <textarea name="input_text" placeholder="Paste your JSON here..."></textarea> <button type="submit">Format</button> </div> <div id="result"></div> <div hx-post="/api/json/format" hx-target="#result" hx-swap="innerHTML" hx-indicator="#spinner"> <textarea name="input_text" placeholder="Paste your JSON here..."></textarea> <button type="submit">Format</button> </div> <div id="result"></div> Build a responsive UI for my developer tools site using htmx. Each tool should: - Have a clean card-based layout - Show a loading spinner during API calls - Display results with syntax highlighting - Have a "copy to clipboard" button - Work on mobile without horizontal scrolling Use CSS Grid for the layout. Dark mode support. Build a responsive UI for my developer tools site using htmx. Each tool should: - Have a clean card-based layout - Show a loading spinner during API calls - Display results with syntax highlighting - Have a "copy to clipboard" button - Work on mobile without horizontal scrolling Use CSS Grid for the layout. Dark mode support. Build a responsive UI for my developer tools site using htmx. Each tool should: - Have a clean card-based layout - Show a loading spinner during API calls - Display results with syntax highlighting - Have a "copy to clipboard" button - Work on mobile without horizontal scrolling Use CSS Grid for the layout. Dark mode support. Create a systemd service file for my FastAPI app running on port 8000 with uvicorn. Also give me an nginx config that: - Proxies / to the FastAPI app - Enables gzip compression - Adds security headers - Handles static file caching Create a systemd service file for my FastAPI app running on port 8000 with uvicorn. Also give me an nginx config that: - Proxies / to the FastAPI app - Enables gzip compression - Adds security headers - Handles static file caching Create a systemd service file for my FastAPI app running on port 8000 with uvicorn. Also give me an nginx config that: - Proxies / to the FastAPI app - Enables gzip compression - Adds security headers - Handles static file caching sudo cp devtoolkit.service /etc/systemd/system/ sudo systemctl enable devtoolkit sudo systemctl start devtoolkit sudo nginx -t && sudo systemctl reload nginx sudo cp devtoolkit.service /etc/systemd/system/ sudo systemctl enable devtoolkit sudo systemctl start devtoolkit sudo nginx -t && sudo systemctl reload nginx sudo cp devtoolkit.service /etc/systemd/system/ sudo systemctl enable devtoolkit sudo systemctl start devtoolkit sudo nginx -t && sudo systemctl reload nginx Generate meta tags, Open Graph tags, and structured data (JSON-LD) for a developer tools website. Include WebApplication schema. Optimize for "online JSON formatter", "hash generator online", "regex tester" keywords. Generate meta tags, Open Graph tags, and structured data (JSON-LD) for a developer tools website. Include WebApplication schema. Optimize for "online JSON formatter", "hash generator online", "regex tester" keywords. Generate meta tags, Open Graph tags, and structured data (JSON-LD) for a developer tools website. Include WebApplication schema. Optimize for "online JSON formatter", "hash generator online", "regex tester" keywords. I'm building [feature description] for my [tech stack] project. Context: - Current file structure: [list files] - Existing patterns: [describe patterns] - Requirements: [specific requirements] Please generate: 1. The complete code with inline comments 2. Any necessary imports or dependencies 3. Error handling for edge cases 4. Brief explanation of your approach I'm building [feature description] for my [tech stack] project. Context: - Current file structure: [list files] - Existing patterns: [describe patterns] - Requirements: [specific requirements] Please generate: 1. The complete code with inline comments 2. Any necessary imports or dependencies 3. Error handling for edge cases 4. Brief explanation of your approach I'm building [feature description] for my [tech stack] project. Context: - Current file structure: [list files] - Existing patterns: [describe patterns] - Requirements: [specific requirements] Please generate: 1. The complete code with inline comments 2. Any necessary imports or dependencies 3. Error handling for edge cases 4. Brief explanation of your approach - Complex CSS animations — often produces verbose, non-performant code - Cross-browser quirks — sometimes suggests non-standard APIs - Security hardening — you still need to review every line - Performance optimization — needs specific guidance, not generic advice - Always provide context — don't make the AI guess your project structure - Be specific about inputs/outputs — define exact data types and formats - Mention existing patterns — AI will follow your conventions - Request edge case handling — this is where most bugs hide - Iterate in small chunks — one feature at a time, not the whole app - I wouldn't use AI for a mission-critical production system without thorough code review - The AI is a force multiplier, not a replacement — you still need to understand what you're building - Security is your responsibility — always audit authentication, input validation, and data handling - Testing still matters — AI-generated code needs tests just like human-written code