Online JSON Compare & Diff Tool

Visually compare two JSON objects side-by-side. View differences, format JSON instantly online.

No Data Stored

100% Client-Side

Free Forever

JSON Compare

Paste your JSON below. Edit directly in the panes to see live, VSCode-style comparison.

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Why use our JSON Compare tool?

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Side-by-Side Diff

View both JSON objects in parallel editors so differences are immediately obvious at a glance.

🎯

Precise Change Detection

Every added, removed, or modified key is highlighted — including deeply nested objects and arrays.

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100% Private

Comparison happens entirely in your browser. Your JSON data is never sent to any server.

📋

Copy & Paste Ready

Paste JSON from any source — API responses, config files, logs — and compare instantly.

What is JSON Diffing?

Comparing two JSON objects manually can be tedious and error-prone. A JSON Diff tool visually highlights the exact additions, deletions, and modifications between an original JSON document and a modified version. It can also be used as a powerful text compare tool.

How to Compare Two JSON Objects Online

Paste your original JSON into the left editor and the modified JSON into the right editor to compare JSON online. The JSON viewer will automatically align the structures and highlight the differences using a standard diff format.

Frequently Asked Questions

What is a JSON diff tool?

A JSON diff tool compares two JSON objects and highlights the differences — added keys, removed keys, and modified values. It's essential when debugging API changes or comparing configuration files.

Can it compare deeply nested JSON?

Yes. The comparison engine recursively traverses nested objects and arrays, showing differences at every level of the structure.

What if my JSON is invalid?

If either input contains invalid JSON, the tool will report a parse error so you can fix it before comparing.

Is there a size limit for JSON comparison?

There is no hard limit — but very large payloads (10MB+) may slow down rendering. For best performance, paste only the relevant parts of your JSON.