GraphQL Playground - Online Query & Schema Explorer
Execute GraphQL queries against any endpoint with variables and headers. Explore schema via introspection. All requests made directly from your browser.
UD5 Toolkit
Add a root field to start building your query.
Execute GraphQL queries against any endpoint with variables and headers. Explore schema via introspection. All requests made directly from your browser.
Enter a GraphQL endpoint, write a query, and see the response. Add headers and variables. Simple testing client.
Paste a JSON object and see a dynamic, draggable tree graph representation. Excellent for debugging nested data.
See interactive Venn diagrams for SQL JOINs: INNER, LEFT, RIGHT, FULL, CROSS. Understand set theory visually. Local static site.
Plot one or more mathematical functions f(x) on a 2D canvas. Zoom, pan, and see intersections. Great for calculus and algebra. Purely client‑side.
Paste a JSON array and filter/transform it using a simple path expression. Extract nested values without code. Local.
Paste a JSON object and generate PlantUML code for a class or object diagram. Preview rendered image.
Drag an angle around the unit circle and see sin, cos, tan values change live. Degrees and radians display. Perfect for learning trig.
Generate random icebreaker questions for meetings, parties, or classrooms. Categories for work, fun, and deep talks.
Fill in a form to generate a valid package.json for your Node.js project. Includes popular scripts and fields. Local only.
Paste a JSON Schema and automatically render a complete, styled HTML form with validation. Perfect for prototyping APIs. Works entirely in the browser.
Watch a simulation of how the JavaScript event loop handles synchronous code, microtasks, and macrotasks. Learn async.
Paste a sample JSON object and generate a basic JSON Schema describing its types and required fields. Local inference.
Paste a JSON array and view it as a formatted console.table() style output. Copy for terminal apps. Local.
Enter your FAQ questions and answers, and get ready‑to‑paste JSON-LD structured data. Boost search appearance.
Set a cron expression and see a calendar of the next 1,000 execution times. Never miss a schedule again.
Search and extract values from a large JSON object using dot/bracket notation. Quickly locate deeply nested fields. Data stays local in your browser.
Build cron expressions using a visual editor with dropdowns. See human-readable description and next run times. Easier than raw cron.
Fill in plaintiff, defendant, claim details and organize supporting documents. Print a summary for court. Local only.
Create JSON-LD structured data snippets for articles, products, and events. Fill in fields and copy the code. SEO helper.
Drag colored beads onto a virtual thread to design a repeating pattern. See total length. Save locally.
Enter up to 20 words and a title to generate a printable word search grid. Custom size.
Generate a QR code with a custom text label below or above. Perfect for printed signs. All generated locally as a single image.
Enter a list of words and generate a custom word search puzzle in PDF/PNG format. Great for teachers and parties. Local.
Create a Review or aggregateRating structured data. Perfect for star ratings in search results. Copy the code.
Run the classic FizzBuzz with custom rules. See the output for any range. A beginner programmer's playground.
Build a recipe rich snippet by filling out ingredients, cook time, and nutrition. Get the valid JSON-LD code.
Generate a LocalBusiness structured data snippet with name, address, phone, and opening hours. Boost local SEO.
Create a Product structured data with reviews, price, and availability. Boost your ecommerce visibility in search.
Experience the four stages of rock tumbling virtually. Start with rough stones and watch them polish over 'days'. Satisfying.