JWT Decoder

Use the free JWT Decoder to decode a JWT into its header, payload and signature.

That is the whole scope of the page. It sits in Developer Tools, the group for format, convert & debug code. The JWT Decoder only does the job in that first sentence.

JWT Decoder runs in your browser. The file or the figures stay on your device, and the free plan does not ask you to create an account.

Use it when a snippet, a payload, or a number needs a format you can paste back into code.

Open it when you need to decode a JWT into its header, payload and signature. If you need a different output, pick the tool whose description names that output.

Paste valid input for the job in the description. An error line usually means the text is not in that shape yet.

Run it once with the values you have. The result should line up with this promise: Decode a JWT into its header, payload and signature. Change one field if you want a second case, and keep the other fields the same so you can see what moved.

Diff the result against what you pasted. Formatting can be right while the data is still the data you typed.

Keep the units, the dates, and the file type that the form showed. A number from the JWT Decoder is ready to copy only after you have checked it against the labels on this page.

The page does not run your project, call your API, or know the version of the library on your machine.

Anything the description does not mention is outside this tool. Use the result as the estimate or the file this page promised, then check the source that actually applies to your bank, school, client, or project.

Other tools in Developer Tools include JSON to CSV Converter, Base64 Encoder/Decoder, URL Encoder/Decoder, Timestamp Converter, JWT Signature Verifier and ROT47 Encoder/Decoder. Open the one whose description matches the next job.