JSON Diff Online — Compare JSON Files

before.json

{
  "user": {
    "id": 42,
    "name": "Ada",
    "roles": ["admin", "editor"]
  },
  "plan": "pro",
  "active": true
}

after.json

{
  "active": true,
  "plan": "team",
  "user": {
    "id": 42,
    "name": "Ada Lovelace",
    "roles": ["admin", "editor", "owner"]
  },
  "limits": {
    "requests": 5000
  }
}

Click Compare to run a diff.

Guides for Diff

All guides →

Guide

Fix Invalid JSON: From 'What's Wrong' to a Clean File

Repair JSON that looks almost right — trailing commas, single quotes, unquoted keys — using a smart formatter that tolerates almost-JSON and then validates strictly.

Guide

Fix Trailing Comma in JSON

A trailing comma after the last object property or array item is valid in some JavaScript contexts, but it is not valid JSON.

Guide

Validate JSON Before API Requests

A quick validation pass before sending an API request can separate JSON syntax problems from authentication, schema, and backend errors.

How JSON Diff works

Paste two JSON (or YAML) documents and get an instant side-by-side comparison. Both documents are parsed and re-serialized with sorted keys before diffing, so differences in key order never create false positives — only real value changes are highlighted.

Use this as a jsondiff, json compare online, or** compare json online** tool for API responses, snapshot tests, fixture files, or webhook payloads. Compare json across two versions of the same document and spot drift in one pass.

Side-by-side view — deleted lines on the left, added lines on the right, unchanged lines in between
Summary metrics — counts of added, removed, changed, and unchanged fields at a glance
JSON & YAML — switch the format toggle to compare YAML documents
Key-order agnostic — {"a":1,"b":2} and {"b":2,"a":1} are treated as identical

FAQ

Why are sorted and unsorted versions reported as identical?

Because JSON objects are unordered by specification. This diff normalises keys before comparing, so {"a":1,"b":2} and {"b":2,"a":1} are equal — only real value differences are highlighted.