Free Online JSON Editor, Validator & Visualizer

See your JSON like never before. Edit, validate, format, and visualize JSON data with unique constellation, tree, and graph views — entirely in your browser. No upload, no ads, no tracking of your data.

What is JSONEditor.net?

JSONEditor.net is a free, privacy-first online JSON editor built for developers. It runs 100% in your browser — your JSON data never leaves your computer. Use it to format, minify, validate, sort, repair, and convert JSON to CSV, XML, YAML, TypeScript interfaces, JSON Schema, SQL, Markdown tables, and more.

Why use a visual JSON editor?

Plain-text JSON quickly becomes unreadable past a few hundred lines. JSONEditor.net offers visual editing modes no other online editor provides:

  • Constellation View — render your JSON as a force-directed graph of connected nodes.
  • Building View — navigate large objects floor-by-floor like a building.
  • Circuit View — explore hierarchies as a radial layout.
  • Graph & Flow Views — interactive node-link diagrams powered by D3 and React Flow.
  • Tree, Table, Code, Split, Diff — classic views for everyday editing.

Features

  • Monaco code editor (the editor that powers VS Code) with syntax highlighting and auto-completion.
  • Real-time JSON validation with detailed error reporting.
  • JSON Schema validation (AJV) and automatic schema generation.
  • 18+ converters: JSON ↔ CSV, XML, YAML, TOML, TypeScript, JSON Schema, SQL, Markdown, Excel.
  • Side-by-side JSON Diff with Monaco DiffEditor.
  • Drag & drop file import, export to JSON / CSV / Excel.
  • Multi-tab workspace with auto-save and 50-step undo / redo.
  • 10+ ready-to-use JSON examples (users, products, API responses, configs).
  • Dark mode, command palette (Ctrl+K), keyboard shortcuts.
  • Installable as a PWA — works offline once loaded.

Privacy first — your data never leaves your browser

Unlike many online JSON tools, JSONEditor.net does not upload your data to any server. All parsing, validation, and conversion happens locally in your browser using JavaScript. We don’t store your JSON, we don’t see it, and we don’t track it.