PrettyJSON

Overview

PrettyJSON is a free online JSON formatter and validator built for developers who work with JSON daily. It formats and validates in real-time as you type, powered by Monaco Editor (the same editor behind VS Code). The tool goes beyond basic formatting — it supports diffing, format conversion, shareable links, and works fully offline as a PWA.

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What Users Can Do

• Format & validate JSON in real-time — Instant feedback as you type with clear error messages
• Pretty print or minify — Toggle between beautified and compact output
• Compare two JSON objects — Side-by-side diff view to spot differences
• Convert formats — Export to YAML, CSV, or TypeScript interfaces
• Import from anywhere — Paste, upload a file, drag & drop, or fetch directly from a URL
• Explore with tree view — Interactive, collapsible JSON tree with search
• Share with a link — Generate expiring URLs (1 hour to 1 week) to share formatted JSON
• Export as JSON5 — Support for comments and trailing commas
• Sort keys alphabetically — Keep objects consistent and easier to compare
• Use keyboard shortcuts — Ctrl/Cmd + Enter to format, Ctrl/Cmd + M to minify
• Install as an app — Works offline as a PWA on mobile and desktop

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Why I Built This

Most online JSON formatters are cluttered with ads, lack advanced features, or don't work offline. I wanted a clean, fast tool that covers the full workflow — format, validate, compare, convert, and share — without leaving the browser. Building it as a PWA means it works even without an internet connection, which is useful when working with local APIs or on the go.

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Tech Stack

• Next.js 16, TypeScript
• Monaco Editor
• Tailwind CSS 4, shadcn/ui
• Zustand (state management)
• nuqs (URL state)
• Neon PostgreSQL + Drizzle ORM (share links)