JSON

JSON Editor

Edit JSON with instant feedback — validation, statistics, and formatting update as you type.

Editing and validation happen locally in your browser. Nothing is uploaded, logged, or stored.

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Start typing or paste JSON, e.g. {"name": "Ada"}...

How to use

  1. Paste existing JSON or start typing from scratch.
  2. Watch the badge: it flips between Valid and Invalid with the exact parser error as you edit.
  3. Use Format or Minify to clean up the document in place.
  4. Copy the finished JSON when you are done.

A scratchpad for JSON

This editor is built for the quick-fix workflow: tweak an API payload, adjust a config snippet, or hand-write a fixture. Every keystroke re-parses the document, so syntax errors surface immediately with the engine's own message, and the header shows key count, array count, and nesting depth so you always know the shape of what you're building.

Unlike a plain textarea, formatting is one click away and never leaves the editor — no copy/paste round-trips. For read-only exploration of a big document, the JSON Viewer is a better fit; to compare two versions after editing, use the JSON Diff tool.

Examples

Tweak an API payload

Paste a request body, flip a couple of fields, verify it stays valid, and copy it back into your HTTP client.

Hand-write config

Build a small config object from scratch with live confirmation that every brace and comma is in place.

Frequently Asked Questions

Is my data uploaded anywhere?+
No. The editor runs entirely in your browser — nothing is sent to a server, even for validation.
Does validation slow down typing?+
No. Parsing happens in the browser and re-runs only when the text changes; documents of a few megabytes still validate instantly.
Can I undo changes?+
Yes — the editor is a standard textarea, so your browser's undo (Ctrl/Cmd+Z) works exactly as usual.
What do the statistics mean?+
Keys counts every object key at all depths, arrays counts array values, and depth is the maximum nesting level — a quick shape summary of your document.

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