JWT Inspector Analyzer Online - Free Browser Tool

JWT Token

Header

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

Payload

{
  "sub": "1234567890",
  "name": "Jane Doe",
  "iat": 1700000000,
  "exp": 9999999999
}

Claims

Algorithm

HS256

Issued At

11/15/2023, 4:13:20 AM

Expires

11/20/2286, 11:46:39 PM

HMAC Verification

Secret

Tip: use samples, upload, copy, download, and send-to actions inside the workspace where available.

What is JWT Inspector?

JWT Inspector Analyzer is a free, browser-based tool that helps you understand a dataset at a glance. Decode JWT header/payload and verify HS256/384/512 signatures. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

How to use JWT Inspector

1Paste your data or drop a file (CSV or JSON).
2Read the generated summary — types, counts, distributions, and any issues found.
3Export the report, or send the data to another tool to act on the findings.

Features

Per-column types, nulls, uniques, and stats
Spot data-quality issues fast
100% client-side — no upload, fully private
Free with no account, no watermark, and no daily limit
Works on large inputs, limited only by your device's memory
Load a sample, then copy, download, or share your result

Common uses

Quick one-off analyzer jobs without opening a heavy app
Preparing data before importing it elsewhere
Sharing a reproducible result with a teammate via a link

Frequently asked questions

How do I use JWT Inspector?: Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Decode JWT header/payload and verify HS256/384/512 signatures.
Is my data uploaded or stored anywhere?: No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.
Is JWT Inspector Analyzer free?: Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.
What's the maximum file size?: There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.
Do I need to install anything?: No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.

What is JWT Inspector?

Frequently asked questions

How do I use JWT Inspector?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Decode JWT header/payload and verify HS256/384/512 signatures.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is JWT Inspector Analyzer free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.