Comparing JSON objects manually is tedious and error-prone, especially with deeply nested structures. This tool performs a deep structural comparison of two JSON documents, highlighting every difference (added keys, removed keys, changed values, and type changes) in a color-coded table view.
Compare two JSON objects and see all differences highlighted. Added, removed, and changed values are shown with their full paths.
| Type | Path | Left Value | Right Value |
|---|---|---|---|
| ~ changed | $.version | "1.0.0" | "2.0.0" |
| ~ changed | $.description | "A collection of developer tools" | "A comprehensive suite of developer tools" |
| - removed | $.age | 30 | -- |
| ~ changed | $.config.theme | "dark" | "light" |
| ~ changed | $.config.notifications | true | false |
| + added | $.config.autoSave | -- | true |
| + added | $.features[3] | -- | "validators" |
| ~ changed | $.address.city | "NYC" | "LA" |
| ~ changed | $.address.zip | "10001" | "90001" |
| + added | $.phone | -- | "+1234567890" |
Paste your first JSON document into the left panel and the second into the right panel. Click 'Compare' to perform a deep diff. The tool highlights differences using color coding: green for added keys/values, red for removed keys/values, and yellow for changed values. A summary shows the total count of additions, deletions, and modifications.
JSON diffing is essential for comparing API responses between environments (staging vs. production) to catch discrepancies, reviewing configuration changes in JSON config files before deployment, debugging data transformations by comparing input and output JSON, verifying database migration results by comparing exported records before and after migration, tracking changes in JSON-based state management stores during development, comparing package.json files across project branches, and validating that API schema changes are backward compatible.
The diff algorithm performs a recursive deep comparison of two JSON trees. For objects, it identifies keys present in only one side (additions/deletions) and keys present in both with differing values (modifications). For arrays, elements are compared by index position. Type changes (e.g., string to number) are flagged separately from value changes. The tool handles edge cases like null values, empty objects vs. empty arrays, and numeric precision differences.
The tool recursively compares two JSON trees node by node. For each key in both objects, it checks if the values are equal. Added keys (only in the second JSON), removed keys (only in the first), and modified values are all identified and displayed with color coding. Arrays are compared index-by-index.
The tool handles JSON documents up to several megabytes. The comparison runs synchronously on the main thread, so very large documents may briefly freeze the UI during processing.
The tool detects four types of changes: added keys (present only in the second JSON), removed keys (present only in the first JSON), modified values (same key with different values), and type changes (e.g., a string changing to a number). All differences are shown in a flat table with color coding.
Transform, format, generate, and encode data instantly. Private, fast, and always free.
Browse All Tools