Developer Tools

JSON Diff Checker

Compare two JSON values and show the differences clearly.

Tool

Use this JSON diff checker to compare two JSON objects or arrays and show added, removed, changed, and type-changed values by path. It is useful for APIs, configs, test fixtures, payload debugging, and version comparison.

Input

Output

About this tool

Use this JSON diff checker to compare two JSON objects or arrays and show added, removed, changed, and type-changed values by path. It is useful for APIs, configs, test fixtures, payload debugging, and version comparison.

Use json diff checker when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.

Learn more

JSON Diff Checker Guide

Read step-by-step usage guidance, best practices, and common mistakes.

JSON Diff Checker FAQ

See common questions and answers about input, output, and tool usage.

JSON Diff Checker Examples

Review practical input and output examples before running the tool.

Related Tools

Find similar and supporting tools for adjacent actions and follow-up tasks.

Why use this tool

Compares JSON structure more clearly than plain text comparison.
Useful for API payloads, configs, fixtures, and debugging.
Helps find changed paths and data types quickly.
Good for one-off before-and-after comparisons in the browser.
Runs directly in the browser with readable structured differences.

How to use

Paste the left and right JSON values into the supported input format.
Run the tool to compare them.
Review the added, removed, and changed paths.
Copy the result if needed for debugging or documentation.

Examples

Example

Input

{"name":"John"}
---
{"name":"Jane","role":"admin"}

Output

Changed and added JSON paths

Shows which values changed and which new keys were added.

Common errors

One side is not valid JSON and the diff cannot run.

Fix: Validate both JSON blocks before comparing them.

The user expects line-based text comparison instead of structure-aware diffing.

Fix: Use text diff if the main goal is raw text comparison.

Only part of the JSON was pasted and the result looks misleading.

Fix: Paste the full left and right structures before comparing.

FAQ

How do I provide the two JSON values?

You can use JSON input with left and right fields or separate the two blocks with a line containing ---.

What kinds of differences does it show?

It shows added, removed, changed, and type-changed values together with their JSON paths.

What usually makes JSON invalid?

Common issues include trailing commas, missing quotes around keys, broken brackets, and pasted partial objects or arrays.

Is this JSON diff checker free to use?

Yes. It works online in the browser.

When should I use JSON Diff Checker instead of Text Diff Checker?

Use JSON diff when you want structure-aware comparison by keys and paths. Use text diff when you only care about line-level differences.

Use cases

Comparing API responses before and after a code change.
Checking config differences between two versions.
Reviewing fixture or payload changes during debugging.