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JWT Decoder Diagram

Decode JWT header, payload, signature, and claims into a readable diagram.

Examples
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Move this preview into a nearby workflow for conversion, debugging, or export.

How to use

  1. 1Examples: choose a starter example or paste your own source.
  2. 2Review the generated preview and adjust labels, conditions, or configuration details.
  3. 3Copy the source or export the rendered result when it is ready for documentation.

Common use cases

README and engineering design docsArchitecture reviews and API documentationAI-generated diagram validation before publishing

FAQ

Can I use this with AI-generated content?

Yes. Use AI for a first draft, then preview and adjust the result before publishing it in documentation.

Use this tool when you need a fast browser workflow for developer documentation, architecture notes, runbooks, API specs, and AI-generated diagrams.

Start with one of the examples, replace it with your own source, and keep the generated output next to the original text so changes stay reviewable.

For production documentation, export SVG or PNG when available and keep the source text in your repository for future edits.

Demo: inspect JWT header and claims

JWTs are easier to review when header, payload, and signature are separated. A diagram makes algorithm, issuer, audience, expiry, and custom claims visible.

  • Check exp, nbf, iss, and aud before trusting a token.
  • Treat decoded payload as readable, not secret.
  • Never paste production tokens containing sensitive user data into public tools.
header.alg = RS256
payload.iss = https://auth.example.com
payload.aud = api
payload.exp = 1781760000

Security checklist: decoding is not verification

A decoder can show claims, but it does not prove the token is valid unless signature verification and issuer policy are checked separately.

  • Do not accept alg=none tokens.
  • Verify signature with the expected key and algorithm.
  • Validate issuer and audience for each service.
decode -> inspect claims -> verify signature -> enforce issuer/audience -> check expiry

Review checklist for JWT Decoder Diagram

Use JWT Decoder Diagram when you need to inspect source content visually before it becomes documentation, a pull request note, an incident write-up, or a handoff artifact. Decode JWT header, payload, signature, and claims into a readable diagram.

Before exporting, check that labels are readable, relationships match the source, generated examples do not contain private data, and the preview still makes sense after you edit the input.

Limits and troubleshooting

If the preview fails, reduce the input to the smallest complete example, confirm the format syntax, and then add sections back one at a time. Many rendering failures come from partial files, indentation mistakes, missing diagram headers, or copied snippets that depend on hidden context.

Treat the preview as a review surface rather than a source of truth. Generated diagrams, converted files, dashboards, and rule examples should be checked before they are used in production documentation or operations.

Example inputs to test

  • Access token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsInNjb3BlIjoicmVhZDpvcmRlcnMgd3JpdGU6Y2FydHMiLCJpc3MiOiJodHRwczovL2F1dGguZXhhbXBsZS5jb20iLCJhdWQiOiJhcGkiLCJleHAiOjE4OTM...
  • ID token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsImVtYWlsIjoiZGV2QGV4YW1wbGUuY29tIiwibmFtZSI6IkRpYWdyYW0gVXNlciIsImVtYWlsX3ZlcmlmaWVkIjp0cnVlLCJleHAiOjE4OTM0NTYwMDB9.de...
  • Service token: eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ3b3JrZXI6YmlsbGluZyIsInNlcnZpY2UiOiJiaWxsaW5nLXdvcmtlciIsInJvbGUiOiJwdWJsaXNoZXIiLCJleHAiOjE4OTM0NTYwMDB9.demo-signature

Tool maturity

Advanced preview

Advanced parser

This tool extracts useful structure and relationships from developer input. Complex edge cases should still be checked against the source.

The maturity label is not a quality score. It tells visitors whether the tool is best for stable export, deeper debugging, quick parsing, or AI-assisted generation.