The dev utilities you reach for.
Format JSON, encode and decode, decode a JWT, hash text, generate UUIDs and convert timestamps and colors — fast tools that run entirely in your browser.
What is the Developer Tools?
BYAFT Developer Tools is a free, all-in-one set of everyday programming utilities that work entirely in your browser. Format and validate JSON, encode or decode Base64 and URLs, decode a JWT, generate hashes and UUIDs, and convert timestamps and colors — without installing anything and without your data ever leaving your device.
Each tool is focused and instant, so you can paste, transform and copy without context-switching to a heavier app.
How to use the Developer Tools
- 1Pick a toolChoose JSON, Base64, URL, JWT, Hash, UUID, Timestamp or Color from the tabs.
- 2Paste your inputType or paste your data — the result updates as you go.
- 3Copy the resultCopy the output back out. Everything runs locally in your browser.
What you can use it for
- Beautifying or validating an API response
- Decoding a JWT to inspect its claims
- Generating a hash, UUID or Base64 string
- Converting a Unix timestamp or a color value
Frequently asked questions
Is my data uploaded to a server?
No. Every tool runs in your browser using your own device, so nothing you paste is uploaded, stored or seen by us.
Does the JWT decoder verify the signature?
No. It decodes and displays the header and payload only — it does not verify the signature, and you should not paste tokens containing secrets.
Which hashes are supported?
MD5, SHA-1, SHA-256 and SHA-512. SHA hashes use the browser’s Web Crypto API; MD5 uses a built-in implementation.
Is it free?
Yes — all the developer tools are free, with no sign-up and no limits.