Developer Tools & Utilities — 12 Claude Artifact Prompts

Developer Utilities You Actually Need — Built Instantly in Claude

Developers constantly switch between tiny utility websites for formatting, testing, and converting. These 12 Claude Artifact prompts build the most useful developer tools right inside Claude — from a JSON formatter with tree view to a regex tester with plain-English explanations. No ads, no cookies, no tracking — just the tool you need.

What's Inside (12 Developer Tool Prompts)

• JSON Formatter & Validator — Paste JSON, get syntax-highlighted, indented output with collapsible tree view. Validates structure, highlights errors with line numbers, shows data types, and includes minify/prettify toggle. Path navigator shows JSONPath for any node.
• Regex Tester with Explanation — Enter a regex pattern and test strings. See matches highlighted in real-time with capture groups color-coded. The killer feature: plain-English explanation of what each regex component does. Includes a regex cheat sheet sidebar.
• CSS Gradient Generator — Visual gradient builder with color picker, angle/direction controls, multiple color stops, and gradient type selection (linear, radial, conic). Live preview on a customizable element. Copy CSS code with vendor prefixes.
• SVG Path Editor — Visual SVG path editor with control point manipulation. Draw paths by clicking, adjust curves with handles, see the SVG path data update in real-time. Import existing SVG paths for editing. Export clean SVG code.
• Base64 Encoder/Decoder — Encode text, files, or images to Base64 and decode back. Supports data URI format for images. Shows byte size comparison (original vs encoded). Handles UTF-8, ASCII, and binary content correctly.
• JWT Token Decoder — Paste a JWT token, instantly see decoded header, payload, and signature verification status. Color-coded sections, expiration time check (expired/valid with countdown), and claims explanation. No token data leaves your browser.
• Cron Expression Builder — Visual cron builder with dropdown selectors for minute, hour, day, month, and weekday. Shows next 10 execution times. Supports standard cron and extended syntax. Plain-English description of the schedule. Common presets included.
• HTTP Status Code Reference — Searchable, categorized reference for all HTTP status codes. Each code shows: number, name, description, common causes, example response headers, and when to use it in your API. Filterable by category (2xx, 3xx, 4xx, 5xx).
• Markdown Table Generator — Visual table builder: set rows and columns, type content in cells, choose alignment per column. Generates clean markdown table syntax. Import from CSV/TSV. Also generates HTML table equivalent.
• Git Command Builder — Interactive git command builder for complex operations. Select what you want to do (rebase, cherry-pick, bisect, etc.), answer questions about your situation, and get the exact git commands with explanations. Safer than Googling.
• API Endpoint Tester — Simple API testing tool: enter URL, method, headers, and body. Send the request and see the response with syntax highlighting, timing, and header inspection. Supports GET, POST, PUT, PATCH, DELETE. (Note: limited by browser CORS policies.)
• SQL Query Formatter — Paste messy SQL, get beautifully formatted output with consistent indentation, keyword capitalization, and clause alignment. Supports MySQL, PostgreSQL, and SQLite dialects. Includes a minify option for deployment.

How to Use

1. Open Claude (claude.ai) with Artifacts enabled
2. Copy the prompt for the developer tool you need
3. Tool appears as an interactive Artifact — use immediately
4. All processing happens in your browser — no data sent to external servers
5. Bookmark frequently-used conversations for quick access

Works With

Claude (claude.ai) with Artifacts. Also works with Gemini Canvas. All tools are self-contained JavaScript — no external dependencies or API calls.