JWT decoder
Paste a JSON Web Token, read the claims, and verify the signature in the browser.
Runs in browser
Use from your agent
Streamable HTTP at https://benchline.fabwaseem.com/mcp. No key. The tool name is decode_jwt.
mcp.jsonjson
1{
2 "mcpServers": {
3 "benchline": {
4 "url": "https://benchline.fabwaseem.com/mcp"
5 }
6 }
7}
tools/calljson
1{
2 "jsonrpc": "2.0",
3 "id": 1,
4 "method": "tools/call",
5 "params": {
6 "name": "decode_jwt",
7 "arguments": {
8 "token": "eyJhbGciOiJub25lIn0.eyJzdWIiOiJhZGEifQ."
9 }
10 }
11}
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How it works
Decode a JWT and verify HS, RS, PS, ES, and EdDSA signatures in the browser. The token and keys are not uploaded.
- 01
Paste the token
Copy a JWT from an Authorization header, a cookie, or a session. A Bearer prefix is stripped.
- 02
Add the secret or public key
HS256, HS384, and HS512 use a shared secret. RS, PS, ES, and EdDSA use a public key as PEM, a JWK, or a JWKS document.
- 03
Read the checks
A verified badge means the signature matches. exp, nbf, and iat are shown as a relative phrase and a UTC time.