JWT Debugger
Decode and inspect JSON Web Tokens in your browser without pasting bearer tokens into a public JWT debugger. DataEngUtils splits the header and payload, validates base64url encoding and highlights expirations locally — the workflow you want when debugging service-to-service auth, OAuth callbacks or short-lived warehouse tokens. Security-conscious teams prefer an offline decoder because tokens embed internal audience claims, tenant identifiers and scopes that should never be logged by a third-party website. It is free, needs no account, and works offline once installed as an app.
Open it in the app
JWT Debugger runs in the DataEngUtils browser app on a Rust engine (Apache Arrow) compiled to WebAssembly — free to use, entirely client-side, and nothing is uploaded.
How it works
1. Paste a JWT
Insert the encoded token from logs, curl output or browser devtools.
2. Inspect the claims
Read the algorithm, payload claims and expiry timestamps in a syntax-highlighted view.
3. Copy decoded JSON
Share redacted claims in tickets without re-encoding the secret.
Why not use an online tool?
Online inspectors tools require uploading your pipeline inputs to a third-party server. For production work, that is a security and compliance risk. DataEngUtils runs a client-side engine in your browser — same convenience, none of the exposure.