How JWT Decoder Tool works
JWT Decoder Tool transforms, validates or analyzes the data you provide according to the operation described on this page. The output should be reviewed before it is used in production code or security-sensitive workflows.
Decode and inspect JSON Web Tokens (JWT) safely in your browser.
{
"alg": "HS256",
"typ": "JWT"
}{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022
}Inspect JWT headers, payload claims, and signature data in your browser. Decoding is performed locally during normal use and is intended for inspection, not proof that a token is valid.
Paste your encoded JWT string into the input area.
View the decoded Header, Payload, and Signature automatically.
Copy decoded JSON sections with a single click.
Browser-based local decoding
Real-time JSON parsing and syntax highlighting
Header, payload, and signature isolation
Free browser-based developer utility
JWT Decoder Tool transforms, validates or analyzes the data you provide according to the operation described on this page. The output should be reviewed before it is used in production code or security-sensitive workflows.
Generated or transformed output should be reviewed before deployment. Do not paste secrets, private keys, passwords or other sensitive credentials into a tool unless its privacy behavior explicitly supports that use.
This tool is designed to perform its main calculation or transformation in your browser. Do not enter information that the tool does not need, and review the site's Privacy Policy for analytics, advertising and third-party services.
Answers about how the tool works, its limitations, and how your information is handled.
No. All decoding operations execute locally within your browser context, without intentionally uploading the token to UtilsDesk servers during normal use.
This tool decodes the payload and header structure. The tool does not perform cryptographic signature verification. Use an appropriate verification library and trusted key material when you need to validate a token.
Standard RFC 7519 JSON Web Tokens formatted with three dot-separated Base64Url segments.
This tool is designed to perform its main calculation or transformation in your browser. Do not enter information that the tool does not need, and review the site's Privacy Policy for analytics, advertising and third-party services.
Continue with related UtilsDesk tools for the same type of task. Each tool has its own instructions, examples, methodology notes, and limitations.