JSON Copilot — JSON Formatter & Editor

About

JSON Copilot is a fast JSON formatter, validator, and viewer that lives in your browser's side panel — so you can clean up and read JSON right next to the tab you're working in, without switching to another site.

Paste any JSON — an API response, a webhook payload, a config file, or messy output from an LLM — and format, validate, explore, or fix it in seconds.

WHAT YOU CAN DO
 • Format & beautify JSON with proper indentation (2 or 4 spaces)
 • Minify JSON for production in one click
 • Validate JSON as you type — errors point to the exact line
 • Validate against a JSON Schema 
 • Explore deeply nested data as a collapsible, colour-coded tree 
 • Turn any JSON into an interactive mind map to see its whole shape at a glance 
 • Handle large files smoothly — built on the Monaco editor that powers VS Code

AI COPILOT
When plain formatting isn't enough, the built-in AI copilot can: • Explain an unfamiliar payload, field by field • Fix broken JSON — quote keys, drop trailing commas, close brackets • Flatten nested objects into flat dot-notation keys, ready for a spreadsheet • Generate a JSON Schema from a sample • Write a schema with AI-written descriptions for every property • Generate realistic test data

PRIVACY
Formatting, minifying, validation, the tree view, and the mind map all run locally in your browser — your JSON never leaves your device. Only data you choose to send to the AI copilot reaches our servers.

PRICING
The core tools are free, with no sign-up to format or validate. Create a free account for the AI copilot, the mind-map view, and saved projects — you start with 1,000 AI credits, no credit card.

GREAT FOR
 • Developers debugging API responses
 • Inspecting webhook payloads from Stripe, Shopify, GitHub and more
 • Cleaning up JSON from ChatGPT and other LLMs
 • Reading and validating config files
 • Anyone who works with JSON every day

Open JSON Copilot from the toolbar, dock it beside any tab, and keep your JSON tools one click away.