🔐 JWT Encoder & Generator

Create and sign JWT (JSON Web Tokens) with custom headers, payloads, and signatures. Support for HS256, HS384, HS512 algorithms. Perfect for testing authentication, API development, and security implementations.

🔑 Algorithm & Secret

Algorithm

Secret Key

Header Encoded

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload Encoded

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022
}

📋 Add Common Claims

✓ Generated JWT Token

Header

Payload

Signature

Complete Token (click to select all):

📚 JWT Structure

Header

Contains token type (JWT) and hashing algorithm (HS256, HS384, HS512)

Payload

Contains claims (user data, permissions, expiration, etc.)

Signature

Verifies token integrity using secret key + algorithm

📖 Common JWT Claims (RFC 7519)

iss (Issuer): Who issued the token "iss": "https://example.com"

sub (Subject): User/subject identifier "sub": "user123"

aud (Audience): Intended recipient "aud": "https://api.example.com"

exp (Expiration): Unix timestamp expiry "exp": 1735689600

iat (Issued At): Unix timestamp created "iat": 1704067200

nbf (Not Before): Unix timestamp valid from "nbf": 1704067200

jti (JWT ID): Unique token identifier "jti": "abc123-def456"

📝 Quick Examples

⚠️ Security Best Practices

Strong Secrets: Use long, random secret keys (32+ characters)
HTTPS Only: Always transmit JWTs over HTTPS
Short Expiration: Set reasonable exp times (15min - 1 hour)
Never Share Secrets: Keep secret keys confidential
Validate Always: Always verify JWT signature on the server
Sensitive Data: Don't store passwords or secrets in payload
Refresh Tokens: Use refresh tokens for long sessions

ℹ️ About JWT Encoder

Create JWTs: Generate signed JSON Web Tokens
3 Algorithms: HS256, HS384, HS512 (HMAC-based)
Custom Payloads: Add any claims and data
Secret Management: Generate random secrets or use your own
Verification: Built-in token verification
Standards Compliant: Follows RFC 7519 specification

💡 Note: This tool runs entirely in your browser. Tokens and secrets never leave your device.

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About JWT Encoder & Generator

Professional JWT token creation tool. Generate signed JSON Web Tokens with custom headers, payloads, and secure signatures for authentication and authorization systems.

Features

Multiple Algorithms: HS256, HS384, HS512 support
Custom Headers: Modify JWT header fields
Flexible Payloads: Add any claims and custom data
Secret Generator: Create cryptographically secure secrets
Quick Claims: Add standard claims with one click
Token Verification: Verify generated tokens instantly
Copy & Download: Easy token export

Use Cases

API Development: Create tokens for API testing
Authentication: Generate user session tokens
Authorization: Create tokens with permissions
Testing: Test JWT validation in your apps
Learning: Understand how JWTs work