JSON Diff Online — Semantic & Text Comparison
Compare two JSON documents with semantic path highlighting or classic line-by-line text diff. DiffForge parses and normalizes JSON locally, then shows exactly what changed — keys added, values modified, and fields removed. No upload, no account, fully offline.
Semantic Path Diff
See changes at the key and value level instead of scanning raw lines. Added fields glow green, removed fields red, and modified values show old → new inline. Nested objects and arrays stay collapsible so large payloads stay readable.
Text Diff for Large JSON
Switch to Text mode for side-by-side or unified line diff powered by diff2html. Ideal when you need Git-style patches, word-level highlights, or HTML export for audit trails. Array reordering is shown as line changes rather than moves.
100% Client-Side
Your JSON never leaves the browser. Parsing, semantic comparison, and text diff rendering all run locally — safe for API responses, config files, and production payloads you cannot send to a server.