JSON Compare
Compare JSON Differences Online
Compare two JSON objects and highlight added, removed, and changed values. All processing runs in your browser.
Browser-only processing. JSON input is not saved and is not sent to ToolGarage.
Input
Input
Output
| Path | Type | JSON A value | JSON B value |
|---|---|---|---|
| Run compare to see differences. | |||
JSON Compare is a browser-based tool that checks two JSON documents and shows values that were added, removed, changed, or kept the same. It is useful when reviewing API responses, application settings, exported data, test fixtures, and structured content before and after a change.
Paste JSON into JSON A and JSON B, or load .json and .txt files from your device. The tool compares the data automatically by default, and you can also click Compare whenever you want. Use the options to include or ignore key order, array order, string case, and value type differences.
When API fields are added, removed, renamed, or changed from one type to another, those changes can be difficult to spot in a large response. This tool highlights each path, making it easier to review release changes, debugging output, mock data, and integration test results.
JSON configuration files often change by small but important amounts. Comparing two versions helps confirm whether a feature flag, endpoint, timeout, locale, or nested setting changed as intended. The text export is also handy for leaving a compact review note.
For messy or minified JSON, use JSON Formatter first, then compare the result here. If your workflow uses both JSON and YAML, the JSON to YAML converter can help you inspect equivalent data structures across configuration formats.
The comparison runs entirely in your browser. ToolGarage does not upload, store, or transmit the JSON you paste into this page. Only non-sensitive preferences such as options, favorite tools, and recently used tool links may be stored in localStorage.
No. JSON input is processed in your browser and is not sent to the server.
By default, key order differences are ignored.
Yes. Array order is compared by default.
Yes. It is useful for checking changes in API responses.
Yes. You can load .json and .txt files.
Yes. The layout switches to one column on smaller screens.
JSON Compare is a free online utility that helps you compare two JSON documents and review added, removed, and changed values by path. It is designed for office workers, students, developers, IT administrators, and anyone who needs a quick result without installing dedicated software. The tool works through a standard web browser and can be used free of charge without creating an account. Its focused controls make it practical for both one-off personal tasks and repeat work.
Yes. You can use the tool free of charge and no account registration is required.
No. The tool runs in a modern web browser, so you do not need to install dedicated software.
Yes. The page is responsive, although a desktop browser may be easier for large files or detailed work.
ToolGarage does not intentionally retain your working data as saved tool content. Browser storage or server communication, when required by a specific feature, is limited to providing that feature.
Yes. Please review important results yourself and follow the rules, security policy, and file-handling requirements of your organization.
Review important outputs before using them. Processing is performed in the browser whenever the feature allows it; tools that must retrieve public website or DNS information communicate only as required to produce the requested result.
ToolGarage is operated by an active systems engineer in Hokkaido, Japan, with hands-on experience in system development, PC deployment, and web production. It provides free calculation, conversion, and diagnostic tools based on tasks encountered in real workplaces.
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