Encodeur/Décodeur JWT
Encoder, décoder et vérifier les JSON Web Tokens avec support de signature HMAC
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About This Tool
How to Use This Tool
Enter Your Data
Input your data using the textarea, file upload, or drag-and-drop. The tool supports various input methods for convenience. Load sample data to see how the tool works.
Configure Settings
Adjust available options to customize processing. Tooltips explain each setting. Default options work well for most common use cases.
Process and Export
Click process or let auto-processing handle it. Review the output for accuracy. Use copy or download buttons to export results. All processing happens locally for privacy.
Technical Implementation
Best Practices & Tips
- ✓Understand when to use JWT. Use this encoding for authentication tokens, not for security (JWT encoding is NOT encryption).
- ✓Verify encoded output. Always test that JWT-encoded data can be decoded correctly. Use our JWT decoder to verify the round-trip works.
- ✓Consider URL safety. When using JWT in URLs, check if you need URL-safe JWT variant (uses - and _ instead of + and /).
- ✓Handle large data efficiently. For very large files, consider breaking data into chunks for better browser performance during JWT encoding.
Troubleshooting Common Issues
Problem: Encoded JWT output doesn't work in my application
Solution: Check if your application expects standard or URL-safe JWT. Also verify line breaks - some systems want JWT in a single line, others expect 76-character line wrapping.
Example: JWT tokens require URL-safe JWT (uses - and _ instead of + and /), while email attachments use standard JWT with line breaks.
Problem: Large files fail to encode or browser crashes
Solution: For files over 50MB, JWT encoding in browser may run out of memory. Try processing in smaller chunks or use a server-side tool for very large files.
Example: A 100MB file might crash your browser. For files this large, consider server-side encoding or split into 10MB chunks.
Related Development Topics
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