Diff JSON Online
Online structural diff that parses both sides first.
Diff JSON Online is a browser-based web developer tool on WebDevToolsBase. Online structural diff that parses both sides first. To use it, paste your input and view the result directly in your browser — no signup and nothing to install.
Diff JSON Online is a free JSON Tools utility that runs entirely in your browser — nothing you enter is uploaded.
Compares all object members safely, ignores object-key order, and compares arrays by index. Numbers are compared as exact decimal values; original number text is retained in differences. Paths use JSON Pointer escaping (~0 for ~ and ~1 for /). Duplicate object member names are rejected. Structural equality does not prove that two JSON Schemas allow the same data.
How to use Diff JSON Online
- Paste the original JSON into the left panel and the revised JSON into the right panel.
- Edit either panel to run the comparison. A selected JSON file is read locally when this page offers file controls.
- Read + as added in the right document, − as removed from the left document, and ~ as changed. Paths identify the affected value.
- Use Copy after the comparison completes. Resolve any syntax or duplicate-member error before copying another result.
About this tool
This tool compares the structure and values of two JSON documents. Object member order is ignored; array positions are compared in order. Schema documents are compared as JSON data, so an equal or different result does not establish schema validity, logical equivalence, or compatibility.
Comparison runs in this browser. Entered JSON and selected file content are not sent to a comparison service. Keep original files separately; this tool produces a difference report and does not merge changes into either file.
Frequently asked questions
How do I use Diff JSON Online?
Place one JSON document in each panel. Read additions, removals and changed values in the result, then copy the report after it completes.
Do I need an account for Diff JSON Online?
No — Diff JSON Online needs no account, sign-up or installation.
Where is my data processed by Diff JSON Online?
Entirely in your browser — Diff JSON Online keeps your data on your own machine and sends nothing anywhere.
Can Diff JSON Online handle large or deeply nested JSON?
Size is limited by the memory and responsiveness of your browser. Deeply nested and large files can take longer to parse and display. Save the original files and use a small representative example before comparing a large document.
Does Diff JSON Online work on mobile?
Yes — Diff JSON Online is just a web page and runs on any modern browser, including phones and tablets.