Text & Code Diff Checker
Compare two texts, code snippets, or JSON files with side-by-side and unified diff views. 100% in-browser, no upload.
Text & Code Diff Checker
| 1 | 1 | { | |
| 2 | 2 | "server": { | |
| 3 | - | "host": "127.0.0.1", | |
| 4 | - | "port": 3000, | |
| 5 | - | "debug": true, | |
| 6 | - | "timeout": 5000 | |
| 3 | + | "host": "0.0.0.0", | |
| 4 | + | "port": 8080, | |
| 5 | + | "debug": false, | |
| 6 | + | "timeout": 10000, | |
| 7 | + | "keepAlive": true | |
| 7 | 8 | }, | |
| 8 | 9 | "database": { | |
| 9 | - | "driver": "sqlite", | |
| 10 | - | "url": "file:dev.db", | |
| 11 | - | "poolSize": 5 | |
| 10 | + | "driver": "postgresql", | |
| 11 | + | "url": "postgres://admin:secret@db.internal:5432/prod", | |
| 12 | + | "poolSize": 25 | |
| 12 | 13 | }, | |
| 13 | 14 | "features": { | |
| 14 | 15 | "auth": true, | |
| 15 | - | "analytics": false | |
| 16 | + | "analytics": true, | |
| 17 | + | "rateLimiting": true | |
| 16 | 18 | } | |
| 17 | 19 | } |
About
In modern software engineering, code review, configuration deployment, and technical writing, comparing two versions of a document or source file is a daily operational task. Whether you are debugging unexpected configuration drift between staging and production environments, reviewing pull requests, inspecting JSON API payload differences, or validating text revisions, having a fast, reliable diff viewer is essential.
However, pasting proprietary application code, database connection strings, or sensitive .env configuration files into third-party cloud comparison websites creates grave security and data leakage liabilities.
Our Text & Code Diff Checker computes precise differences completely client-side in your browser's local memory. Powered by the proven Myers Longest Common Subsequence (LCS) algorithm, it highlights additions, deletions, and unchanged segments with zero external network requests.
Core Engineering Features
- Side-by-Side (Split) & Unified Views: Easily switch between a dual-pane side-by-side comparison and a single-column Git-style unified diff.
- Accurate Line & Character Alignment: Visual color coding (emerald for additions, rose for deletions) makes changes instantly recognizable.
- Whitespace & Case Normalization: Toggle options to ignore leading/trailing whitespace changes or case discrepancies when identifying substantive edits.
- Standard Unified Diff (.patch) Export: Generate and download standard unified diff patches ready to apply via
git applyor Unixpatch. - One-Click Text Swap: Invert the comparison direction instantly to see rollbacks or reverse changes.
- 100% Local RAM Isolation: Your proprietary source code, database passwords, and .env files are never uploaded or indexed anywhere.