JWT Batch Decoder – Bulk Decode & Analyze JWTs
Instantly decode, validate, and analyze multiple JWT tokens at once. Export results, check security, and streamline your workflow—all in your browser.
Batch JWT Decoder
Paste, upload, or drag & drop multiple JWTs for batch analysis
Drag & drop JWT file here or click to browse
Supports .txt, .jwt, .json files
Batch decoded
0 total0 valid0 invalidAvg. Score: 0
| # | Token | Header | Payload | Signature | Score | Issues |
|---|
What is a JWT Batch Decoder?
A JWT Batch Decoder allows you to decode, validate, and analyze multiple JSON Web Tokens at once. This is especially useful for developers, security auditors, and QA teams who need to process large sets of tokens efficiently.
How does it work?
- Paste or upload a list of JWTs (one per line, comma, or space separated).
- Get instant decoding, security analysis, and CSV export for all tokens.
- All processing is done locally in your browser for maximum privacy.
JWT Fundamentals
- What is a JWT? A compact, URL-safe token format for securely transmitting information between parties as a JSON object.
- JWT Structure: Consists of a header, payload, and signature. Each part is Base64URL encoded and separated by dots.
- Security Best Practices: Always validate signatures, set short expirations, and avoid sensitive data in payloads.
- Common Claims:
iss(issuer),sub(subject),aud(audience),exp(expiration),nbf(not before),iat(issued at),jti(JWT ID). - JWT vs Other Tokens: JWTs are stateless and self-contained, unlike session tokens or API keys.
- Troubleshooting: Use this tool to quickly spot invalid tokens, expired signatures, or misconfigured claims in bulk.
Frequently Asked Questions
What's the maximum number of JWTs I can process at once?
There's no hard limit, but for optimal performance, we recommend processing up to 10,000 tokens at once. Larger batches might slow down your browser. If you have more tokens, split them into smaller batches for better performance.
How should I format multiple JWTs for batch processing?
You can separate JWTs using newlines (one per line), commas, or spaces. Our tool automatically detects the format. Each JWT should be complete (header.payload.signature format). You can also upload a text file with JWTs.
Can I export the batch analysis results?
Yes! Click the 'Export CSV' button to download a comprehensive report including token details, security scores, issues, and recommendations. The CSV can be opened in Excel, Google Sheets, or any spreadsheet application for further analysis.
Why do some tokens show as 'Invalid' in batch processing?
Tokens marked as 'Invalid' have structural issues like incorrect format (missing dots), invalid Base64 encoding, or malformed JSON in header/payload. Check the error message for specific details. These aren't signature validation failures but fundamental format problems.
How is the average security score calculated?
The average security score is calculated only from valid tokens in your batch. Invalid tokens are excluded from the calculation. Each valid token gets a score (0-100) based on our security analysis, and we compute the arithmetic mean of all valid scores.