Format, validate & understand JSON with an AI copilot
Built for the messy JSON you deal with every day: API responses, webhook payloads, and LLM output. Beautify and validate it, explore it as a tree or mind map, then reshape it with AI.
No sign-up to format · Core processing runs in your browser · 1,000 free AI credits on signup
No JSON handy? Load a sample
From broken webhook to clean schema
Seven steps, end to end. Click through them, or load the broken payload and try it yourself.
A raw webhook body from your logs, with a few errors in it.
{
"event": "order.paid",
"status": active,
"amount": 4999,
"items": ["sku_1", "sku_2",],
"customer": {
"email": "ada@example.com"
}One JSON, every angle
The same payload, formatted, explored, visualized, and explained. Scroll through what you get.
Clean, valid JSON in one click
Beautify messy JSON, minify it for production, and catch errors as you type with line-level messages that point to the problem.
- Pretty-print & minify
- Real-time syntax validation
- Validate against a JSON Schema
{
"user": {
"id": 1042,
"name": "Ada Lovelace",
"email": "ada@example.com",
"active": true,
"roles": [
"admin",
"editor"
],
"address": {
"city": "London",
"zip": "EC1A"
}
},
"orders": [
{
"id": "A-9001",
"total": 129.99,
"paid": true
},
{
"id": "A-9002",
"total": 49.5,
"paid": false
}
]
}Explore deeply nested data
Browse large objects and arrays as a collapsible, type-coloured tree, and expand only the branches you care about.
- Collapsible nodes
- Type-aware colouring
- Built for big documents
See the whole shape at a glance
Turn any JSON into an interactive, colour-coded mind map that shows structure and relationships at a glance.
- Colour-coded by type
- Multiple layouts
- Pan, zoom & rearrange
Let AI do the tedious parts
Explain an unfamiliar payload, flatten nested data, or generate a JSON Schema, all inside the editor.
- Explain JSON
- Flatten JSON
- Generate JSON Schema
- Schema + AI descriptions
Summary
An account object with a user profile and a list of orders. Each order tracks an id, total amount, and payment status.
user.emailstringPrimary contact address for the account holder.
user.activebooleanWhether the account is currently enabled.
user.roles[]stringPermission roles granted to the user.
orders[].totalnumberOrder amount charged, in USD.
Everything stays in sync
Click any field in the output, a node on the mind map, or a card in the AI explanation. The match lights up across all three. Try it:
user.emailSummary
A user profile with an id, name, contact email, status flag, and assigned roles.
user.idnumberUnique identifier for the user record.
user.namestringFull display name of the account holder.
user.emailstringPrimary contact address for the account.
user.activebooleanWhether the account is currently enabled.
user.rolesstring[]Permission roles granted to the user.
Every JSON tool, one tab
Format, validate, convert, visualize, and document JSON. Core tools and converters run in your browser; Copilot tools run in the editor.
Core tools · run in your browser
Convert & transform · run in your browser
Where the AI Copilot helps
Common jobs the AI Copilot handles in a couple of clicks.
Decode an unfamiliar API response
Paste a payload you have never seen and get a clear explanation of what each field means.
Explain JSONFlatten data for a spreadsheet
Collapse nested objects into flat dot-notation keys, ready to map to columns or export to CSV.
Flatten JSONGenerate a validation schema
Infer types, required fields, and constraints from a sample so you can validate future data.
JSON SchemaDocument your data model
Produce a JSON Schema with AI-written descriptions for every property, so you ship data-model docs without writing them by hand.
Schema + DescribeDebug a large payload fast
Click any field in the AI result to jump straight to it in the editor and mind map, and back again.
Mind Map SyncOnboard to a new codebase
Make sense of config files and fixtures without reading every line by hand.
Explain JSONRepair broken JSON
Paste invalid JSON; the AI quotes keys, drops trailing commas, and closes brackets, then you apply the fix in one click.
Fix & ValidateMore AI actions on the way
See what the AI returns
One input, four actions. Pick one to see the output it produces.
{
"user": {
"id": 42,
"name": "Ada",
"active": true
},
"tags": ["admin", "editor"]
}user.id: Unique identifier for the user, as an integer.user.name: The user's display name.user.active: Whether the account is currently enabled.tags: Roles assigned to the user, as an array of strings.Your data stays in your browser
Formatting, minifying, validation, schema checks, conversions (CSV, YAML, XML, TypeScript), tree view, and mind maps all run locally. Your JSON never leaves your device. Only the data you send to the AI Copilot, or save to a project, touches our servers.
- Format, minify & validate without ever uploading your data
- Schema validation and tree/mind-map views run entirely offline
- AI features send only the JSON you choose to transform
// formatted in-browser { "name": "JSON Copilot", "private": true, "features": [ "format", "validate", "mindmap", "ai" ] }
Frequently asked questions
Yes. Core formatting, validation, schema checks, tree view, and mind maps all run locally in your browser, so your JSON never leaves your device. Only data you send to the AI Copilot or save to a project reaches our servers.
Learn more about: Is my JSON data safe and private?Built for the data you handle at work
Your JSON often holds customer records, payment events, and access tokens. The core tools keep all of it on your device.
Runs in your browser
Format, validate, tree, and mind map never upload your JSON.
No account to start
Open the editor and format or validate right away, for free.
AI is opt-in
The AI only sees the JSON you choose to send it. Nothing else leaves your device.
Ready to clean up your JSON?
Open the editor and start formatting. No sign-up required.
Open the Editor