JSON CopilotJSON Copilot
Open Editor
Chrome Extension · Developer Tools

A JSON formatter that lives in your Chrome side panel

Format, minify, validate and visualize JSON right next to the tab you're working in — with a collapsible tree, an interactive mind map, and an AI copilot that explains and fixes messy payloads. No tab-switching, no pasting into a random website.

Add to Chrome Use the web app

Rolling out now — the Chrome Web Store link goes live once Google finishes reviewing the listing.

Free · Core tools run locally · No sign-up to format or validate

api.example.com/orders
JSON Copilot Chrome extension docked in the browser side panel, showing formatted JSON

Everything the web editor does — docked in a panel

The full JSON Copilot toolset, one click from your toolbar and beside whatever you're already looking at.

Format & validate

Clean, valid JSON in one click

Paste messy JSON and get clean, indented output — 2 or 4 spaces, your call. Need it small for production? Minify the whole thing in one click. Errors are caught as you type and point at the exact line that broke.

  • Pretty-print & minify
  • Real-time errors, down to the line
  • Validate against a JSON Schema
Formatted, validated JSON in the JSON Copilot side panel
Tree view

Explore deeply nested data

Turn a wall of brackets into a colour-coded, collapsible tree. Types are labelled — string, number, array — and you expand only the branches you care about. Built for deep API responses and long config files.

  • Collapsible nodes
  • Type-aware colouring
  • Made for big documents
Collapsible, type-coloured JSON tree view in the side panel
Mind map

See the whole shape at a glance

Render any JSON as an interactive, colour-coded mind map and take in its structure in one look. Click a node to jump straight to that line in the editor, and back again.

  • Colour-coded by type
  • Click a node, jump to the line
  • Pan, zoom & rearrange
Interactive JSON mind map in the JSON Copilot side panel
AI Copilot

Let AI do the tedious parts

When formatting isn't enough, the copilot explains an unfamiliar payload field by field, fixes broken JSON, flattens nested objects into dot-notation for a spreadsheet, and generates a JSON Schema or test data from a sample.

  • Explain & fix JSON
  • Flatten to dot-notation
  • Generate a schema or test data
AI Copilot explaining a JSON payload in the side panel

Up and running in three clicks

1

Add it to Chrome

Install JSON Copilot from the Chrome Web Store and pin it to your toolbar.

2

Click the icon on any tab

The panel opens on the side, next to whatever page you’re already looking at.

3

Paste your JSON

Format, validate, browse the tree or mind map, or ask the copilot — without leaving the tab.

Private by design

Your JSON stays in your browser

Formatting, minifying, validation, the tree view and the mind map all run locally in the extension — your JSON never leaves your device. The only data that reaches our servers is what you deliberately send to the AI copilot.

  • Format, minify & validate without ever uploading your data
  • Tree and mind-map views run entirely on your device
  • The AI copilot only sees the JSON you choose to send it
// formatted in the side panel
{
  "runs": "in your browser",
  "uploads": false,
  "tools": [
    "format",
    "validate",
    "tree",
    "mindmap"
  ]
}

Chrome extension FAQ

Yes. Formatting, minifying, validation and the tree view are free with no sign-up. A free account adds the AI copilot, the mind-map view and saved projects, and comes with 1,000 AI credits — no credit card.

Keep your JSON tools one click away

Add JSON Copilot to Chrome and format, validate and visualize JSON in the side panel — beside any tab.

Add to Chrome Or use the web app

In review — the Chrome Web Store link activates once Google approves the listing.