An OAuth token validator checks the structure and validity of OAuth tokens, JWTs, Bearer tokens, Basic Auth credentials, and API keys. Paste any token below to detect its type, verify format compliance, decode JWT claims, check expiration, and get a clear VALID/INVALID verdict.
Header
Payload
Claims
Validation Checks
How to Use the OAuth Token Validator
This OAuth token validator auto-detects and validates any token type used in modern authentication flows. Paste a token and immediately see what type it is, whether the structure is valid, and for JWTs — the decoded claims and expiration status.
Supported Token Types
JWT (JSON Web Token): Three dot-separated base64url segments. The most common format for OAuth access tokens. This tool decodes header and payload, checks standard claims (exp, iat, iss, sub, aud), and reports whether the token has expired.
Bearer Token (opaque): Random strings used as OAuth access tokens that aren't JWTs. The tool checks character set validity and length requirements.
Basic Auth: Base64-encoded "username:password" strings. The tool decodes and verifies the colon separator format.
API Key: Detects common API key formats including UUID (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx), hex strings, and base64-encoded keys.
JWT Expiration Check
If the JWT payload contains an exp claim, the tool compares it against the current time. Expired tokens will fail validation even if structurally correct — any properly implemented server will reject them.
Signature Note
Cryptographic signature verification requires the secret key or RSA/ECDSA public key, which you should never paste into any online tool. This validator confirms structural validity and claim correctness without attempting signature verification.
FAQ
What types of tokens does this tool validate?
This tool validates JWT (JSON Web Tokens) with full claim decoding, Bearer tokens (opaque format checking), Basic Auth tokens (base64 encoded credentials), and API keys (UUID, hex, and base64 format detection).
Can this tool verify the JWT signature?
No — signature verification requires the secret key or public key, which you should never paste into an online tool. This validator decodes the header and payload structure, checks claims, and verifies expiration, but explicitly cannot verify the cryptographic signature.
What does VALID mean for a JWT?
VALID means the token is structurally correct: 3 dot-separated segments, valid base64url encoding in header and payload, the header contains an 'alg' field, and the token is not expired (if an 'exp' claim exists). It does NOT mean the signature was cryptographically verified.
Is my token safe to paste here?
All validation runs in your browser — tokens are never sent to any server. However, treat production tokens like passwords. For debugging OAuth flows, use development/test tokens whenever possible.
Is this tool free?
Yes, completely free. No account or signup required. Decode and validate unlimited tokens.
How is this different from the JWT Validator?
The JWT Validator focuses on debugging JWT structure with a full visual breakdown. This OAuth Token Validator supports multiple token types (JWT, Bearer, Basic Auth, API keys) and focuses on quick VALID/INVALID assessment for any OAuth-related token format.