JWT Decoder Connector for AI agents.
2 live capabilities
Decode authentication tokens and Base64 payloads with 100% accuracy.
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Why people use JWT Decoder
JWT & Base64 Decoder for Authentication Payload Inspection
This Connector changes that. You just hand the token to your agent and get a clean JSON object back instantly. It handles the binary decoding with native precision so you can see headers, user IDs, and expiration dates without leaving your workspace.
What Vinkius changes
You get 100% accurate data from encoded strings without any AI guesswork.
Use it from Claude, ChatGPT, Cursor or another AI client you already have.
One account · 5,900+ Connectors
- Real-world use case 01
Auditing a failed login
A dev asks the agent to check why a token failed.
- Real-world use case 02
Inspecting API responses
A QA tester gets a Base64 blob from a webhook and asks the agent to use decode_base64_string to see the contents.
- Real-world use case 03
Debugging Auth Headers
A backend dev wants to see the sub claim in a Bearer token and has the agent decode it on the fly.
Complete set · 2capabilities
The complete JWT Decoder capability set.
These are the exact actions your AI can choose when you ask it to work with JWT Decoder.
01—02
2 capabilities in this set.
Part of 2 available through JWT Decoder.
- 01 Capability
Decode base64 string
Converts raw Base64 strings into readable UTF-8 text. It's perfect for quickly reading encoded payloads.
- 02 Capability
Decode jwt token
Breaks down a JWT into its header and payload. It also calculates the exact expiration timestamp for you.
Set up in minutes
One URL. Then ask JWT Decoder to work.
Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use JWT Decoder from the conversation.
Choose your client
Live previewAdvanced clients IDE · CLI
Claude · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/mcp - Step 01
Open Connectors
In Claude Web or Claude Desktop, open Settings and choose Connectors.
- Step 02
Add the URL
Choose Add custom connector, name it JWT Decoder, and paste the URL above.
- Step 03
Turn it on in chat
Select +, open Connectors, and enable JWT Decoder for the conversation.
ChatGPT · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/mcp - Step 01
Open MCP settings
On desktop, open Settings and MCP servers. On web, open your workspace app or connector settings.
- Step 02
Add the URL
Choose Add server with Streamable HTTP, or create a custom MCP app, then paste the JWT Decoder URL.
- Step 03
Save and start
Save the connection and enable JWT Decoder in your conversation. Desktop may ask you to restart once.
Cursor · IDE configuration
Advanced setup
{
"mcpServers": {
"jwt-base64-decoder": {
"url": "https://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/mcp"
}
}
}- Step 01
Open MCP Settings
Press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → search "MCP Settings"
- Step 02
Add the server config
Paste the JSON configuration above into the mcp.json file that opens
- Step 03
Save the file
Cursor will automatically detect the new Connector
- Step 04
Start using JWT Decoder
Open Agent mode in chat and ask: "Using JWT Decoder, help me...". 2 tools available
VS Code Copilot · IDE configuration
Advanced setup
{
"mcpServers": {
"jwt-base64-decoder": {
"url": "https://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/mcp"
}
}
}- Step 01
Create MCP config
Create a .vscode/mcp.json file in your project root
- Step 02
Add the server config
Paste the JSON configuration above
- Step 03
Enable Agent mode
Open GitHub Copilot Chat and switch to Agent mode using the dropdown
- Step 04
Start using JWT Decoder
Ask Copilot: "Using JWT Decoder, help me...". 2 tools available
Windsurf · IDE configuration
Advanced setup
{
"mcpServers": {
"jwt-base64-decoder": {
"url": "https://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/mcp"
}
}
}- Step 01
Open MCP Settings
Go to Settings → MCP Configuration or press Cmd+Shift+P and search "MCP"
- Step 02
Add the server
Paste the JSON configuration above into mcp_config.json
- Step 03
Save and reload
Windsurf will detect the new server automatically
- Step 04
Start using JWT Decoder
Open Cascade and ask: "Using JWT Decoder, help me...". 2 tools available
Cline · IDE configuration
Advanced setup
{
"mcpServers": {
"jwt-base64-decoder": {
"url": "https://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/mcp"
}
}
}- Step 01
Open Cline MCP Settings
Click the Connectors icon in the Cline sidebar panel
- Step 02
Add remote server
Click "Add Connector" and paste the configuration above
- Step 03
Enable the server
Toggle the server switch to ON
- Step 04
Start using JWT Decoder
Ask Cline: "Using JWT Decoder, help me...". 2 tools available
Claude Code · Terminal command
Advanced setup
claude mcp add jwt-base64-decoder --transport http "https://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/mcp"- Step 01
Install Claude Code
Run npm install -g @anthropic-ai/claude-code if not already installed
- Step 02
Add the Connector
Run the command above in your terminal
- Step 03
Verify the connection
Run claude mcp to list connected servers, or type /mcp inside a session
- Step 04
Start using JWT Decoder
Ask Claude: "Using JWT Decoder, show me...". 2 tools are ready
Where the request belongs
Work JWT Decoder can move forward.
Security engineers who need to audit tokens without manual decoding, and backend devs who are tired of their AI hallucinating payload values during debugging.
Security Engineer
Auditing auth logs for expired tokens or suspicious claims during a security review.
Backend Developer
Debugging API requests and checking user metadata in JWTs on a Tuesday afternoon.
QA Engineer
Verifying that the correct data is being passed in headers during integration testing.
Build the capability set
Add more capabilities.
Each Connector adds new actions and data without changing how you work.
Browse Connectors
JWT Payload Extractor
Extract and decode JWT payloads deterministically without cryptographic verification.
Deterministic JWT Inspector
Transform your AI into a cybersecurity diagnostic capability. Instantly decode and inspect JSON Web Tokens (Headers, Payloads, and Expiry metadata) without requiring signature keys.
JWT Decoder & Verifier
Decode and mathematically verify JWT tokens local. Ensure API authentication tokens are cryptographically authentic and not expired.
JWT Claims Validator
Validate JWT structure and expiration claims without signature verification.
JWT Decoder & Validator
Decode JWT segments and verify cryptographic signatures and temporal claims.
Base64 Charset Normalizer
Identifies, decodes, and normalizes Base64 payloads with strict charset enforcement.
Bring your own AI
Change the model, client or framework. Keep JWT Decoder connected.
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Claude -
ChatGPT -
Gemini -
Cursor -
VS Code -
Windsurf -
ZCode -
Cline -
Zed -
Continue -
Kiro -
Roo Code -
Zencoder -
Goose -
Void -
Augment Code -
Amp -
Qodo -
Tabnine -
Pieces -
Sourcegraph Cody -
JetBrains -
Warp -
Amazon Q -
Antigravity -
BoltAI -
Raycast -
Jan -
LM Studio -
AnythingLLM -
Open WebUI -
Msty -
Cherry Studio -
LibreChat -
TypingMind -
Chorus -
5ire -
n8n -
LangChain -
LlamaIndex -
CrewAI -
Vercel AI SDK
Before you connect
Questions about JWT Decoder.
The practical details behind the request, access and result.
Can the JWT & Base64 Decoder handle large payloads?
Yes, it handles standard JWTs and Base64 strings using native buffers, making it reliable for typical production payloads.
Does the JWT & Base64 Decoder verify signatures?
No, this capability is strictly for decoding. It helps you see what's inside the token without performing security validation.
Can I use JWT & Base64 Decoder for debugging?
Absolutely. It's a primary capability for developers who need to see auth claims, headers, and timestamps while debugging APIs.
Will JWT & Base64 Decoder hallucinate dates?
No. It calculates the exact expiration date from the 'exp' claim using native math, ensuring you get the correct timestamp every time.
Is JWT & Base64 Decoder safe for production use?
It is safe for inspection purposes. Since it only decodes data and doesn't perform actions, it's a great way to audit your logs.
Is it secure?
Yes, decoding runs completely local.
Does it verify the JWT signature?
No, this is a strict decoder for reading payloads, not an authentication gateway.
Can it decode hex as well?
It is specialized in Base64 and JWT headers/payloads.
One connection away
Give your agent a direct line to JWT Decoder.
Connect JWT Decoder once. Keep it beside 5,900+ managed Connectors when the next task needs more.
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