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Diff Checker

Compare text or JSON and see the differences

Diff results will appear here...

About Diff Checking

What is a Diff?

A diff (difference) shows the changes between two versions of text or data. It highlights what was added, removed, or modified, making it easy to see exactly what changed between versions. Diff tools are essential for code review, document comparison, and version control.

  • Visual comparison: See exactly what changed between two versions
  • Line-by-line analysis: Compare text line by line or character by character
  • Structured comparison: Compare JSON and other structured data formats
  • Version control: Essential tool for Git and other version control systems

Types of Diff

Type Description Use Cases
Text Diff Compares plain text line by line Code changes, document revisions, configuration files
JSON Diff Compares JSON structures, ignoring order and formatting API responses, configuration changes, data validation
Unified Diff Shows context lines around changes Code reviews, patch files
Side-by-Side Shows both versions side by side Document comparison, visual review

Common Use Cases

  • Code Review: Review changes in pull requests and commits
  • Document Comparison: Compare different versions of documents
  • Configuration Management: Track changes in configuration files
  • API Testing: Compare API responses between versions
  • Data Validation: Verify data transformations and migrations
  • Version Control: Understand changes in Git commits
  • Debugging: Identify what changed between working and broken versions

Diff Notation

Diffs typically use symbols to indicate changes:

  • + (Plus): Lines added in the new version (shown in green)
  • - (Minus): Lines removed from the old version (shown in red)
  • = (Equal): Lines that remain unchanged
  • ~ (Tilde): Lines that were modified

Example:

Original:
Line 1
Line 2
Line 3

Modified:
Line 1
Line 2 Updated
Line 3
Line 4

Diff:
= Line 1
- Line 2
+ Line 2 Updated
= Line 3
+ Line 4

Text vs JSON Diff

Text Diff

  • Compares line by line
  • Shows exact character differences
  • Preserves whitespace and formatting
  • Best for: Code, plain text, documents

JSON Diff

  • Compares structure and values
  • Ignores formatting differences
  • Handles nested objects and arrays
  • Best for: API responses, config files, data structures

Best Practices

  • Use appropriate diff type: Choose text diff for code, JSON diff for structured data
  • Ignore whitespace when needed: Use the ignore whitespace option for cleaner diffs
  • Review context: Look at surrounding lines to understand the full context of changes
  • Validate JSON: Ensure JSON is valid before comparing
  • Use version control: Integrate diff tools with Git for better workflow
  • Document changes: Add comments explaining why changes were made