JSON Diff & Compare

Paste two JSON snippets and instantly see the structural differences. Toggle 'sort keys' to compare structurally (ignoring key order) — useful when comparing API responses, config files, or data dumps where key order varies. Shows a colored line-by-line diff with added/removed counts and a copyable unified diff. Validates each side independently and shows parse errors inline. Everything runs in your browser.

Left JSON

Right JSON

Sort keys (compare structurally, ignore key order)

+4 -2

Diff

 {
-  "city": "Bethesda",
+  "city": "DC",
+  "joined": "2026-05-18",
   "name": "Saurav",
   "tags": [
     "dev",
-    "ai"
+    "ai",
+    "founder"
   ]
 }

Related Tools

Improve My Prompt

Paste any LLM prompt and get specific, actionable fixes against 12 best-practice rules from Anthropic, OpenAI, and Google. Free, no login.

CLAUDE.md Reviewer

Paste your existing CLAUDE.md and get specific, numbered suggestions for fixing vague rules, missing sections, and token waste. AI-powered, free.

Word & Character Counter

Count words, characters, sentences, and reading time in Markdown. Free online Markdown-aware word counter.

Link Extractor

Extract all URLs and links from Markdown text. Free online Markdown link extractor.

About JSON Diff & Compare

Free online JSON diff tool. Compare two JSON objects side-by-side with structural sorting. See added, removed, and changed keys with colored output. No signup, browser-only. This tool runs entirely in your browser — no data is sent to any server. Your content stays private and secure. MarkdownMe provides free, fast, and reliable Markdown tools for developers, writers, and anyone who works with Markdown.