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About Code Compare
Paste two versions of code or text and instantly see the differences highlighted. Added lines are green, removed lines are red, and unchanged lines provide context. Essential for code reviews and debugging.
Whether you're reviewing a pull request, comparing config files, or trying to understand what changed between two versions, this diff tool shows you exactly what's different—line by line.
How to use Code Compare
Paste the original (old) version in the left panel.
Paste the modified (new) version in the right panel.
See differences highlighted automatically.
Toggle between side-by-side and inline views.
Use 'Ignore whitespace' for cleaner diffs.
Examples
Basic diff output
How additions and deletions are shown:
- const greeting = "Hello"; + const greeting = "Hello, World!"; console.log(greeting); - (red) = removed in new version + (green) = added in new version (unchanged) = same in both
Multi-line changes
Complex changes are shown in blocks:
function process(data) {
- if (data == null) {
- return;
- }
+ if (!data) return;
+
+ // Added validation
+ if (!Array.isArray(data)) {
+ throw new Error('Expected array');
+ }
return data.map(transform);
}Config file comparison
Quickly spot what changed in configuration:
database:
host: localhost
- port: 3306
+ port: 5432
- engine: mysql
+ engine: postgresql
timeout: 30Features
When to use this
- •Reviewing pull request changes
- •Comparing configuration files
- •Finding what changed between deploys
- •Debugging regressions by comparing versions
- •Checking code formatting changes
- •Verifying copy-paste accuracy