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
- Open Claude (claude.ai) with Artifacts enabled
- Copy the prompt for the developer tool you need
- Tool appears as an interactive Artifact — use immediately
- All processing happens in your browser — no data sent to external servers
- 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.
AI & Automation
