# JWT Decoder — Inspect Claims, Expiry & Algorithm

> JWT Decoder — Inspect Claims, Expiry & Algorithm — axel-belfort-jwt-decoder. Use this tool when you need to decode and inspect JSON Web Tokens (JWTs) without verification, extracting header, payload, and signature information to debug authentication flows or inspect token claims. It takes a JWT token as input and returns a decoded object containing header, payload, claims, expiry timestamp, and algorithm. Ideal for development and testing scenarios where token structure and claims need to be verified, but not its validity or security.

Canonical page: https://skillsregistry.net/skills/axel-belfort-jwt-decoder  
JSON: https://api.skillsregistry.net/v1/skills/axel-belfort-jwt-decoder

## Description

JWT token decoder API for AI agents. Decode and inspect JSON Web Tokens without verification: extract header (algorithm, type), payload (claims, issuer, audience), expiry timestamp, and signature info.

Tools: security_decode_jwt.

Use this for debugging authentication flows, inspecting token claims, or verifying token structure. IMPORTANT: This decodes without verifying — for security validation, verify signatures server-side.

Returns: {header, payload, claims, expiresAt, algorithm}. No API key required — x402 micropayment $0.001/call on Base L2.

## Trust

- **Trust score (0–1):** 0.73
- **Verification tier:** verified
- **Last scanned:** 2026-09-03

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** finance
- **Updated:** 2026-09-03

## Source

- **Source listing:** [Smithery](https://smithery.ai/server/axel-belfort/jwt-decoder)
- **Repository:** <https://github.com/Br0ski777/jwt-decoder-x402>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "axel-belfort-jwt-decoder"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/axel-belfort-jwt-decoder` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/axel-belfort-jwt-decoder/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt