Encoding & crypto
JWT parser
Decode JWT header and payload (Base64URL JSON)—signatures are not verified.
JSON Web Tokens bundle claims for OAuth and APIs. This tool Base64URL-decodes the header and payload so you can inspect `exp`, `iss`, and scopes during debugging. It never proves authenticity: anyone can forge unsigned bytes—always verify signatures and claims on the server with the real keys.
Similar tools
Quick links to related utilities—same workflow, different input or output.
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FAQs
Does this validate signatures?›
No. Cryptographic verification needs the issuer’s public key and should run in trusted server code.
Is it safe to paste tokens?›
Tokens often carry PII or authorization. Use masked tokens or local tools for production systems.
What are the three JWT parts?›
Header, payload, and signature—joined by dots. This UI decodes the first two for readability.
General
Do these tools send my data to Exemplar’s servers?›
By default, conversion and formatting run entirely in your browser. Nothing is uploaded to Exemplar for normal paste-and-transform workflows. Tools that deliberately open an external service (for example, a third-party speed test) are called out on the page.
Do I need an account or install anything?›
No account is required. Everything runs in the browser—there is nothing to install for these utilities. They complement the Exemplar platform but work standalone.
Are these utilities open-source or the same as other sites?›
These pages are built for Exemplar’s audience (developers working with APIs, config, and ops data). Behavior may differ slightly from other online tools; always verify critical output in your own environment.
Are there size or performance limits?›
Very large inputs can slow down or crash the tab—especially for images, huge JSON, or multi‑MB HAR files. For production-scale data, prefer local CLI tools, streaming parsers, or your own pipelines.
Can I use output in production?›
Yes, when you have validated it. Parsers and formatters here aim to be helpful for everyday tasks but are not a substitute for tests, schema validation, or security review where it matters.
Where can I read more about privacy?›
See our Privacy policy at /privacy for how exemplar.dev handles site analytics and general data practices.