Project Story: JsonPlayground

Inspiration

As a developer, I constantly find myself working with raw JSON: copying API responses, debugging configs, formatting payloads, or comparing deeply nested objects. I often switch between multiple tools like online editors, browser extensions, or even VS Code just to format or validate simple JSON.

I wanted a lightweight, local-first tool that lives in the browser and works offline — fast, responsive, clean, and without the overhead of extensions or accounts. The One-Shot Competition on Bolt.new gave me the perfect creative constraint: build it all with a single prompt and no AI or backend.

What it does

JsonPlayground is a client-side JSON editor, formatter, validator, and comparator built with React and Tailwind CSS. It lets you:

• Paste or write raw JSON and get instant validation
• Format or minify JSON with one click
• Copy formatted output
• Enable comparison mode to see differences between two JSON objects
• Work completely offline, without backend or extensions
• Toggle between light and dark mode

How we built it

I designed the prompt to include reusable components for input, output, diff comparison, and error handling — all rendered within a responsive layout. I focused on utility and clarity: a large editor area, useful feedback, and minimal distractions.

The app was generated using Bolt's one-shot prompt builder. It uses useState and useEffect for all state logic, and native JSON.parse() and JSON.stringify() functions for formatting and validation.

Challenges we ran into

• Ensuring valid JSON input without blocking the UI
• Designing a comparison feature that’s both lightweight and readable
• Handling edge cases with trailing commas, comments, or invalid nesting
• Creating a consistent layout across desktop and mobile with Tailwind only
• Writing a complete spec in a single prompt without follow-up edits

Accomplishments that we're proud of

• Fully working JSON tool with formatting, validation, and comparison
• Built using only one prompt, without external libraries or backend logic
• Clean, responsive UI with zero clutter
• Fast UX with instant parsing and copy support

What we learned

• Prompt-driven development is a creative design discipline
• Tailwind CSS is powerful for building clean interfaces fast
• Keeping tools focused makes them more useful
• Native browser capabilities are often enough when used well

What's next for JsonPlayground

• Add support for collapsible trees in the output panel
• Highlight key differences visually in diff mode
• Local storage for draft recovery
• Export results to files (e.g., .json, .txt)
• Add support for JSON schema validation

Built With

• next.js
• tailwind
• typescript