Compare Two JSON Online – Free JSON Diff Tool

Two JSONs are identical

Left missing (present only in Right)

None

Left extra (not present in Right)

None

Different values in both

None

Right missing (present only in Left)

None

Right extra (not present in Left)

None

Different values in both

None

Equal in both

{
age: 25
meta: {
x: 1
y: 2
}
name: "Alice"
tags: [
0: "a"
1: "b"
]
}

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Full guide

JSON Compare Tool

What is JSON Compare?

JSON Compare (JSON Diff) is the process of comparing differences between two JSON datasets. In development, it's commonly used for:

  • API Response Comparison: Verify consistency before and after interface changes
  • Configuration File Comparison: Check environment configuration differences
  • Data Migration Verification: Ensure data integrity after migration
  • Version Difference Analysis: Compare data structures across versions

Features

Side-by-Side Comparison View

Left and right columns display differences at a glance:

Left ColumnRight Column
Left missing (only in Right)Right missing (only in Left)
Left extra (not in Right)Right extra (not in Left)
Different values (left value)Different values (right value)

Smart Normalization

  • Sort by Key Name: Ignore key order differences, focus on content
  • Path Tracking: Each difference shows JSON Pointer path

Local Processing

All comparisons happen in your browser, no data leakage concerns.

Use Cases

Case 1: API Response Verification

Left: Production API response
Right: Test API response
Result: Quickly locate field changes

Case 2: Configuration File Comparison

Left: Default configuration
Right: Current configuration
Result: View customized settings

Case 3: Data Version Comparison

Left: Old version data
Right: New version data
Result: Analyze data structure evolution

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