JSON Editor Guide
How to edit, format, validate, beautify, and view JSON using the free JSON Editor — everything below applies whether you got here from the editor, the viewer, or any of the standalone tools.
Features
- Code, Tree, Table, Graph, and Raw views of the same document
- Instant validation with precise line and column errors
- One-click formatting and beautifying with configurable indentation
- Minify JSON to a compact, transfer-optimized form
- Multi-tab workspace for working on several documents at once
- Side-by-side comparison with added/removed/modified highlighting
- Import from file drag-and-drop; export as JSON or a ZIP of tabs
- Offline-first — documents persist locally between sessions
How to Use the JSON Editor
- Paste JSON into the editor, or drag and drop a .json file onto the page.
- Switch between Code, Tree, or Table view depending on how you want to read or edit it.
- Fix any errors flagged inline — each one points to the exact line and column.
- Format or minify with a single command from the toolbar or command palette (⌘K).
- Copy the result or export it as a file when you're done.
JSON Formatting Example
Before — minified, hard to scan:
{"id":1,"name":"Ada Lovelace","roles":["engineer","writer"],"active":true}After — formatted with the JSON Formatter:
{
"id": 1,
"name": "Ada Lovelace",
"roles": ["engineer", "writer"],
"active": true
}Frequently Asked Questions
What is a JSON editor?
A JSON editor is a tool for writing, reading, and modifying JSON (JavaScript Object Notation) data. A good one does more than a plain text box — it highlights syntax, catches structural errors, and lets you explore deeply nested data as a tree or table instead of a single wall of text.
How do I edit JSON online?
Paste your JSON into the editor, or drag and drop a .json file onto the page. You can type directly in the Code view, or switch to Tree or Table view to edit individual values without hand-editing brackets and commas.
How do I format JSON?
Open the command palette (⌘K) or use the Format command to beautify your JSON with consistent indentation. The dedicated JSON Formatter page offers the same formatting with configurable indent width if you just need a quick one-off format.
How do I validate JSON?
Invalid JSON is flagged automatically as you type, with the exact line and column of the problem. For a focused validation-only workflow with detailed error messages, use the JSON Validator page.
How is a JSON viewer different from a JSON editor?
Same tool, different focus: opening the JSON Viewer starts you in Tree view for reading and exploring structure, while still letting you edit if you need to — nothing is locked read-only.
Can I view large JSON files?
Yes. Tree and Table view only render the nodes you expand, so large documents stay responsive instead of rendering thousands of lines of raw text at once.
Is this JSON editor free?
Yes. Every tool on this site is free, with no account, sign-up, or usage limit.
Is my JSON data private?
Yes — your JSON never leaves your browser. There's no backend and no server-side processing: documents are held in memory and persisted locally via your browser's IndexedDB storage, not uploaded anywhere.
Can I use this JSON editor on mobile?
Yes, the editor works in mobile browsers, though a larger screen makes working with deeply nested JSON considerably easier — Tree and Table view help here on smaller screens.
Ready to work? Open the JSON Editor, JSON Viewer, or browse every tool.