---
title: "Local JWT Decoder - Blobster"
description: "Decode JWT header and payload locally in your browser. Blobster shows claim timing and safety warnings without uploading tokens."
canonical: "https://www.mochavi.com/blobster/local-jwt-decoder"
markdown_mirror: "https://www.mochavi.com/blobster/local-jwt-decoder.md"
language: "en"
generated_from: "prerendered HTML"
---

> Canonical HTML: [https://www.mochavi.com/blobster/local-jwt-decoder](https://www.mochavi.com/blobster/local-jwt-decoder)
>
> This machine-readable Markdown mirror is generated from the canonical page during the Mochavi production build.

Blobster use case

# Decode JWTs locally before sharing claims.

Blobster decodes the header and payload in your browser and shows claim timing warnings. It does not verify signatures.

[Install from Chrome Web Store](https://chromewebstore.google.com/detail/blobster/epddolhfilamhbnmgglenceabjbbeeho) [Blobster overview](https://www.mochavi.com/blobster)

**How do I decode a JWT without uploading it?**

Blobster does not send tokens to a server. Signature verification is outside the current decoder.

-   No document upload
-   No account
-   No telemetry

## Where Blobster fits.

Decode header and payload in the browser.

Show \`exp\`, \`iat\` and \`nbf\` as readable times where present.

Warn on expired tokens and \`alg: none\` cases.

## Typical workflow.

Use Blobster as a fast local inspection step before copying, sharing or acting on data.

1.  01 **Paste or open a JWT**
2.  02 **Review the decoded header and payload**
3.  03 **Copy only the claim or redacted output you need**

## Use the local viewer, not a paste site.

Blobster is built for quick inspection of structured developer data that may contain tokens, customer payloads, headers, internal URLs or support evidence.

[Install from Chrome Web Store](https://chromewebstore.google.com/detail/blobster/epddolhfilamhbnmgglenceabjbbeeho)