JSON Compare — Free Online JSON Diff Tool

JSON Compare — Free Online JSON Diff Tool. Free online JSON compare tool. Paste two JSON objects to instantly see differences, added keys, and removed values — all processed in your browser with no data uploaded.

Instantly compare JSON objects and find differences with our free online JSON diff tool. Paste two JSON payloads side by side to get a color-coded view of added, removed, and changed keys — all computed client-side with no data uploaded to any server.

Perfect for QA engineers verifying API responses, developers debugging config changes, and anyone who needs to compare JSON files quickly.

Our JSON compare tool supports JSON5 syntax, shareable links, and a 'show differences only' mode — making it the fastest way to spot JSON differences without leaving your browser. Comparison runs locally.

Copy link includes both inputs in the URL; avoid sharing secrets. Ads make separate network requests. Also try our JSON Prettify, JSON Minify, and JSON to YAML Converter for a complete JSON toolkit.

Frequently asked questions

Can I open a JSON file from my device?

Yes. Choose Open file, select a UTF-8 .json, .json5 or .txt file up to 256 KiB, then choose Use file to replace that editor’s text. Cancel or a validation error keeps your input unchanged. Imports allow 64 nested containers and 10,000 values including containers. Files are read locally; no file is sent by the import control. Applied text stays in this page’s memory. Copy link includes your input, so avoid sharing secrets.

How do I compare two JSON objects?

Paste the first document into Your first JSON and the second into Your JSON to compare. As soon as both are valid, a diff tree appears: added values are green, removed values are red, and a changed value shows the old value in red next to the new one in green. Identical inputs show The provided JSONs are the same.

How do I see only the differences?

Turn on the Only show differences switch above the result. Unchanged keys and array items are hidden so only added, removed and updated entries remain, which helps with large API responses.

Does key order or array order matter?

Key order in objects does not matter because keys are matched by name. Arrays are compared position by position, so the same items in a different order are reported as changes.

Can I compare JSON with comments or trailing commas?

Yes. Both inputs are parsed as JSON5, so comments, single quotes, unquoted keys and trailing commas are accepted. If a box cannot be parsed, Invalid JSON format appears under it and no diff is shown.

How do I share a JSON comparison?

Click Copy link to copy a URL that contains both JSON inputs, so anyone who opens it sees the same comparison. The data is stored in the link itself, so do not share links that contain secrets.

Is my JSON uploaded to a server?

No. The comparison runs entirely in your browser. Your JSON only leaves the page if you choose to share a link that contains it.

How to use this online tool

JSON Compare — Free Online JSON Diff Tool is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.

Private processing in your browser

JSON Compare — Free Online JSON Diff Tool keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.

When this tool is useful

Use JSON Compare — Free Online JSON Diff Tool for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.

Practical tips

Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.