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Coding Tools
JWT Encoder/Decoder
Decode JSON Web Tokens for inspection.
Technical Documentation & User Guide
JWT Encoder/Decoder Reference & Specifications
The JWT Decoder inspects JSON Web Tokens by splitting them into header, payload, and signature, and decoding the readable JSON parts. JWTs appear in authentication flows and API tokens everywhere, and debugging them usually means a base64 decode by hand - this tool does it instantly.
The tool clearly notes that the signature is not verified here; it only displays the token's contents for inspection.
Key Capabilities & Features
- Splits a JWT into header and payload sections.
- Pretty-prints the decoded JSON.
- Flags the signature as unverified.
Step-by-Step Instructions
- Paste the full JWT string.
- Click Decode JWT.
- Review the decoded header and payload JSON.
Real-World Developer & Design Workflows
- Inspecting what claims an access token carries.
- Troubleshooting expired or malformed tokens in logs.
- Learning JWT structure from a real example.
Frequently Asked Questions
Is decoding a JWT the same as authenticating?
No. Anyone can decode a JWT's JSON - only the signature proves who issued it. This tool does not verify signatures.
Are the decoded details sensitive?
Tokens contain readable claims, so treat decoded content as you would any log data. Don't paste tokens containing live credentials into a public context.