01 / PASTE
Add both payloads
Paste the original JSON and the updated JSON into side-by-side editors, or load a sample to explore the tool.
Umentoz MinuteJSON
MinuteJSONby UmentozCompare JSON payloads before they break production.
MinuteJSON is a secure, offline-capable JSON diff and schema inspection tool that runs entirely in your browser. Paste two payloads, catch breaking changes, and export clean summaries without exposing sensitive data.
100% client-sideNo account requiredWorks offline
Original payload{
"user": {
"id": 1042,
"status": "active",
"plan": "pro"
}
}
"user": {
"id": 1042,
"status": "active",
"plan": "pro"
}
}
Updated payload{
"user": {
"id": "1042",
"status": "active",
"tier": "pro"
}
}
"user": {
"id": "1042",
"status": "active",
"tier": "pro"
}
}
1added field
1removed field
2breaking changes
Private by designPayloads stay in your browser
Structural comparisonPaths, values, and types
Breaking-change alertsRemoved keys and type changes
Clean exportsMarkdown and JSON Patch
How MinuteJSON works
From two payloads to a clear answer.
No upload flow, configuration, or account setup. MinuteJSON validates and compares JSON as you work.
02 / COMPARE
Inspect structural differences
MinuteJSON identifies added, removed, value-changed, and type-changed fields at their exact JSON paths.
03 / ACT
Review and export
Filter to breaking changes, jump directly to affected paths, and export a Markdown summary or JSON Patch.
JSON breaking changes
Know what changed—and what could break.
Not every difference carries the same risk. MinuteJSON distinguishes ordinary value updates from structural changes that can break clients, integrations, tests, and automations.
Removed fields
A key expected by a consumer no longer exists in the updated payload.
Type changes
A field changes from one JSON type to another, such as a number becoming a string.
Added fields
A new path appears in the updated JSON without removing an existing contract.
Value changes
The path and type remain stable while the field's value changes.
Privacy-first JSON comparison
Your payloads stay on your device.
MinuteJSON performs JSON validation, comparison, filtering, and export processing locally in the browser. Your pasted payloads are not sent to a backend, stored on Umentoz servers, or written to server logs.
No backend payload storageNo server-side JSON processingLocal browser persistenceOffline-capable
Features
A focused JSON diff tool for real workflows.
Built for quick payload inspection before API changes reach downstream consumers.
Real-time validation
Catch invalid JSON immediately with useful syntax guidance before running a comparison.
Side-by-side editors
Keep the original and updated payload visible together for faster inspection.
Formatting controls
Prettify, minify, clear, or load sample JSON from either editor.
Clickable JSON paths
Select a comparison result to jump directly to the affected field.
Useful filters
View all changes, only breaking changes, or ordinary value changes.
Portable exports
Download a readable Markdown diff summary or standards-based JSON Patch.
Local persistence
Recover your current comparison after an accidental refresh without creating an account.
Offline support
Continue inspecting payloads without a network connection after the app is available offline.
Zero-upload workflow
Work with internal or sensitive payloads without intentionally transmitting them for comparison.
Who it is for
Built for teams that depend on stable payloads.
Developers
Review API responses and identify contract changes during implementation.
QA engineers
Compare expected and actual payloads while investigating test failures.
API teams
Spot removed keys and type changes before publishing a new response format.
Product teams
Understand payload changes affecting integrations, analytics, and automations.
Questions
MinuteJSON FAQ
Does MinuteJSON upload my JSON to a server?
No. JSON validation and comparison run locally in your browser. MinuteJSON does not require your payloads to be uploaded for processing.
What JSON differences does MinuteJSON detect?
It detects added fields, removed fields, changed values, and fields whose JSON type has changed. Results include the relevant JSON path.
What counts as a breaking JSON change?
MinuteJSON flags removed fields and type changes as breaking because downstream consumers may rely on those paths and value types.
Can I use MinuteJSON offline?
Yes. Its service-worker-supported design allows the app to remain available offline after the required files have been cached by your browser.
Which export formats are available?
You can export a human-readable Markdown comparison summary or a machine-readable JSON Patch.
Ready to compare?
Catch the breaking change now.
Open MinuteJSON and compare two payloads directly in your browser.