Developer tools
JWT Decode
Decode a JSON Web Token header and payload without sending it anywhere. Nothing you enter leaves your browser.
Your result will appear here.
What this tool does
About the JWT Decode
Decode a JSON Web Token header and payload without sending it anywhere. It is intended for development and debugging workflows where a small, inspectable transformation is faster than setting up a script.
It is intended for development and debugging workflows where a small, inspectable transformation is faster than setting up a script.
How to use it
- Paste JWT in the input pane. Use the example button if you want to see the expected syntax.
- Review the input for the structure shown in the example. Then select “Decode JWT.”
- Inspect the result for warnings or structural differences, then copy it into the destination system.
Practical example
Start with a known input
Try this sample input: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiQXZlcnkiLCJpYXQiOjE1MTYyMzkwMjJ9.signature Select “Decode JWT” and compare the result with the source before using it elsewhere.
What to know about the result
- Processing happens in this browser. Your entered text and selected files are not sent to FormatCalc for conversion.
Common questions
Using the JWT Decode
Is the JWT Decode free to use?
Yes. FormatCalc's JWT Decode is free to use with no account required.
Is my data private when I use the JWT Decode?
Yes. This tool processes your input locally in your browser. FormatCalc does not upload or store what you enter.
How do I use the JWT Decode?
Paste or type your input, select any available options, and choose Decode JWT. You can then copy the result.
What should I check before using the result?
Processing happens in this browser. Your entered text and selected files are not sent to FormatCalc for conversion.