Code Diff Checker
Compare two snippets or files with developer-focused, JSON-aware diffing and split or inline views.
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Compare two versions of code or structured text when you need to spot exactly what changed.
What to expectPaste both versions side by side and the tool will highlight additions, removals, and edits with synchronized scrolling.
Good to knowIt is optimized for readability and review, not for applying patches or merging conflicts.
How it works
- Paste or type the original content into panel A and the modified content into panel B.
- Select the language and tweak options like whitespace, case sensitivity, or semantic JSON diffing.
- Switch between split and inline views to review changes before copying or exporting the diff.
All comparisons run entirely in your browser. The snippets you paste are not sent to any server or stored.
Frequently Asked Questions
How is this diff checker different from diffchecker.com?
DataSmith's diff checker is focused on developer workflows: it supports JSON-aware semantic diffs, language hints, and a clean UI with no ads or tracking scripts. It is designed to be a fast, distraction- free way to compare code or config before committing or sharing.
Can I compare JSON files and see structured differences?
Yes. When you select JSON as the language, the tool pretty-prints your input and can treat ordering differences separately from value changes. This makes it much easier to see real changes in config or API responses without being distracted by noise.
Does this diff checker send my code to a server?
No. All diff computation happens in your browser, so the original and modified snippets never leave your machine. That makes it safe for comparing private code, secrets in config files, or production logs in a controlled environment.
Can I use this diff checker for large files or long snippets?
The viewer is optimized for typical source files and configuration snippets. Larger pastes still work, but scrolling and rendering may be slower since everything runs client-side; for full repositories, a git diff in your IDE will usually feel smoother.
What is a semantic JSON diff and when should I use it?
Semantic JSON diff parses your JSON before comparing, so it can ignore irrelevant ordering changes and focus on actual value differences. It's ideal for reviewing config changes, feature flags, or API responses where key order does not matter.
Can I ignore whitespace-only changes in the diff?
Yes. Enable the Ignore whitespace option to collapse differences that are purely formatting, like indentation or trailing spaces. This is useful when you want to clean up a file without treating it as a substantive code change.
How to use this tool
Paste or type content in both panels. Use the language selector and options to refine the diff. Added lines are green, removed red, unchanged have no highlight. Scroll is synchronized between panels.