Compare JSON Files

About this tool

Everything this JSON diff tool checks

CompareFiles is a free tool to compare JSON online — paste two API responses, config files, or payloads and see every difference instantly. The comparison runs entirely in your browser, so nothing is ever uploaded or stored.

• Baseline and Candidate — Baseline (left) is the expected or reference response; Candidate (right) is the one you're checking against it. Differences are always reported as changes from Baseline to Candidate.
• Compares automatically — as soon as both panels hold valid JSON, a comparison runs with no extra step. Uncheck Compare responses to pause it while you edit.
• Field-by-field differences — value changes and type mismatches are called out separately, not lumped together.
• Missing-field detection — spot anything present on only one side, in either direction.
• Structure changes — catch shape drift, such as added, removed, or renamed keys, independent of the actual values.
• Ordered or unordered array comparison — match array items by position, or by content when order doesn't matter.
• Ignore paths — exclude noisy fields such as timestamps or request IDs with an exact path, a * wildcard, or a recursive **, with JSON Pointer support.
• Paste, drop, or fetch — load JSON by pasting it directly, dragging in a file, or importing from a URL or cURL command.
• Advanced View — reveals comparison settings and the full results below the panels: differences, missing fields, and structure findings, with filtering, review notes, and per-field ignore controls.
• Shareable reports — export findings as a Markdown report for a pull request or ticket.