JWT Token Decoder
Decode and inspect JSON Web Tokens instantly. View the header, payload and check expiry without any backend. 100% client-side.
About the JWT Token Decoder
Decode and inspect JSON Web Tokens instantly. View the header, payload and check expiry without any backend. 100% client-side.
JWT Decoder splits a JSON Web Token into its three parts — header, payload, and signature — and displays the decoded JSON content. Paste any JWT to instantly see what claims it contains, when it expires, and what algorithm was used to sign it.
- Type
- Tool
- Runs in
- Your browser — no account, no install
- Price
- Free
- Privacy
- Inputs stay on your device unless the tool says otherwise
Frequently asked questions
A JWT (JSON Web Token) is a compact, URL-safe means of representing claims between two parties. It consists of three parts: header, payload, and signature, allowing secure transmission of information.
To decode a JWT token, simply paste it into the JWT Token Decoder tool. The tool will then display the header and payload in a readable format.
Decoding a JWT token helps you verify its contents, including claims and expiration. This is crucial for ensuring the token's authenticity and security in applications.
Yes, you can decode the header and payload of a JWT token without the secret key. However, to verify the signature and ensure its integrity, you will need the secret key.
Yes, the JWT Token Decoder is a secure online tool. It does not store any tokens you input, ensuring your data remains private and confidential.
Explore This Topic
Related Tools
Formats and beautifies JSON data for better readability. Developers and data analysts use it to quickly debug and visualize JSON structures.
Generate JSON Web Tokens (JWT) with custom headers and payloads. Sign with HMAC-SHA256 using Web Crypto API. 100% browser-based — your secret key never leaves your device.
Test CORS headers on any API endpoint. Check Access-Control-Allow-Origin, allowed methods, and headers in real-time from your browser.
Parse .env files, catch syntax errors before deploy, and export to JSON, YAML, or shell exports. Auto-detects and masks sensitive keys (API keys, tokens, passwords).
Convert any image to a Base64 data URI for embedding in HTML, CSS, or JSON. Instant conversion in your browser.
Compare two pieces of text side by side and see exactly what changed. Essential for reviewing document edits, code changes, or any version comparison.