JSON Diff

JSON Diff - Compare JSON Objects Online

Compare two JSON objects and instantly see all differences. Shows added, removed, and changed values with their JSONPath locations.

Paste two JSON objects or arrays into the side-by-side input panels. Click Compare to analyze structural and value differences. The tool highlights added properties (present in the second JSON only), removed properties (present in the first JSON only), and changed values where keys exist in both but values differ. Each difference displays the JSONPath showing its location in the structure. Nested objects and arrays are recursively compared. Color coding (green for additions, red for removals, yellow for changes) makes differences immediately apparent. All comparison logic runs in your browser.

API developers verify that response format changes between versions don't break client contracts. QA engineers compare expected vs. actual JSON outputs from automated tests to identify failures. DevOps teams diff configuration files between staging and production environments to spot inconsistencies. Data pipeline engineers validate JSON transformations by comparing input and output to ensure no data loss occurred.

Order matters in arrays—[1,2,3] vs. [3,2,1] shows every element as changed even if the same values exist. If you need set-like comparison, sort arrays before diffing. Deep nesting can produce hard-to-read JSONPaths—expand the path in a text editor to understand the location. Null vs. undefined vs. missing keys are different states—ensure your comparison accounts for the distinction that matters to your use case. For large JSON files, diff performance degrades; consider sampling or splitting into logical chunks.

All processing happens directly in your browser. Your files never leave your device — no server uploads, no cloud storage, no data retention. The tool works offline once loaded, requires no registration, and is completely free with no usage limits.