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Tool workflow

Debug a JWT or API token

OAuth and API gateways return bearer tokens that are easy to misread in logs. This workflow decodes the JWT structure, formats nested JSON for review, and uses Base64 utilities when you need to inspect individual segments—without installing CLI tools.

Last updated: 2026-07-06

Steps (3 tools)

Work through each step in order. Your progress is saved in this browser (0 of 3 complete, 0%). Utilnivo does not save your files between tools.

Progress: 0 of 3 steps complete (0%)

  1. Decode JWT

    JWT Decoder

    Inspect header and payload JSON, including exp and iat timestamps.

    • Browser-based
    • No signup
    Open JWT Decoder

  2. Format JSON

    JSON Formatter

    Pretty-print nested claim objects copied from the payload.

    • Browser-based
    • No signup
    Open JSON Formatter

  3. Decode Base64

    Base64 Encoder & Decoder

    Inspect individual segments or nested Base64-encoded claim values.

    • Browser-based
    • No signup
    Open Base64 Encoder & Decoder

When to use this workflow

  • A login flow returns a token and you need to verify claims.
  • exp, iat, or custom roles look wrong in application logs.
  • You are comparing test tokens across environments.
  • You need to decode a nested claim encoded as Base64.

Tips

  • Never paste production secrets on shared screens or into untrusted sites.
  • JWT Decoder shows payload but does not verify signatures—verification belongs in your backend.
  • Treat decoded tokens as sensitive; payloads are only encoded, not encrypted.

Frequently asked questions

Does this verify the signature?

No. JWT Decoder displays structure for debugging. Signature verification requires your app’s keys and algorithms.

Is my token sent to a server?

Decoding and formatting run in your browser. Utilnivo does not store pasted tokens.

Which algorithms are supported?

See JWT Decoder for supported alg values such as HS256 and RS256. Unsupported algs may still decode payload segments.

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