{"uid":"cap_o1fs6wIlQxyNSorTMGgj-","slug":"jwt-decoder-dt0ur-online-cd38fe43","name":"JWT Decoder (dt0ur.online)","description":"Decodes a JWT's header and payload for inspection. Does NOT verify the signature — for debugging/inspection only, never trust the output as authenticated.","url":"https://dt0ur.online/api/utility/jwt-decode?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"token":{"type":"string","description":"A JWT in header.payload.signature form"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_zgiD5nYNBlv2Nnh6wti04","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Decodes a JWT's header and payload into readable JSON for inspection and debugging, without verifying the signature.","exampleAgentPrompt":"Can you decode this JWT for me so I can see what claims are in the payload? Here's the token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c","exampleUseCases":[{"title":"Debug expired auth token","prompt":"I'm getting a 401 error and I think my JWT might be expired — can you decode this token and check the 'exp' field? eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzQ0MiIsImV4cCI6MTcwMDAwMDAwMH0.signature"},{"title":"Inspect user claims from SSO token","prompt":"We just got a SAML/JWT from our SSO provider and I want to see what user roles and claims are encoded in the payload — can you decode this JWT for me? eyJhbGciOiJIUzI1NiJ9.eyJ1c2VySWQiOiJhYmMxMjMiLCJyb2xlcyI6WyJhZG1pbiIsImVkaXRvciJdfQ.sig"},{"title":"Audit JWT header algorithm","prompt":"Before we trust this token, can you decode it and tell me what signing algorithm is listed in the JWT header? Here it is: eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.eyJpc3MiOiJhdHRhY2tlciJ9."}],"resultDescription":"Returns the decoded JWT header (as a JSON object with fields like 'alg' and 'typ') and the decoded payload (as a JSON object with all encoded claims such as 'sub', 'iat', 'exp', 'roles', etc.). The signature is NOT verified — results should be treated as informational/debugging data only, not as authenticated.","failureModes":["Malformed JWT (not in three-part header.payload.signature format) returns an error","Non-base64url-encoded segments cause a parsing failure","Empty or missing token field returns a validation error","Extremely large tokens may be rejected","If the payload is not valid JSON after decoding, the result may be a raw string or error"],"whenToPreferThis":"Use this endpoint when you need to quickly inspect or debug the contents of a JWT token — for example, to check expiry, read user claims, or audit the signing algorithm — without needing to validate its cryptographic signature. Prefer this over manual base64 decoding when you need a clean structured JSON output. Do NOT use this when you need to verify that a token is authentic or untampered; this endpoint provides no signature validation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T00:42:29.713Z","isFirstParty":false,"canonicalSlug":"jwt-decoder-dt0ur-online-cd38fe43"}