How to generate a JWT using basic PHP commandlines?

I have run VS code on my virtual machine to ease the PHP debug.

As we all know JWT consists of 3 parts;

• Header
• Payload
• Signature

In this blog, we are going to analyze on how to generate a JWT using basic PHP command lines.

1.Header

• This specifies the type of token (JWT) and the signing algorithm (HS256).
• <?php is the opening tag for PHP code.

2.Payload

• The payload holds the data that is being transmitted (claims).
• 3 types of claims; registered claims, public claims, private claims.

3. Base64URL Encoding

• JWT requires Base64URL encoding to be URL-safe

4.Converting to JSON and encode

• Convert both arrays → JSON → Base64Url.

5.Create the signature

• Use HMAC-SHA256 with your secret key.
• Sign the header.payload string.
• Encode again with Base64Url.

6.Combine base65urlheader, base64urlpayload and base64urlsignature

• JWT = header.payload.signature