validateSignature(body, channelSecret, signature)

It is a function to check if a provided channel secret is valid, compared with a provided body.

Type signature

function validateSignature(
  body: string | Buffer,
  channelSecret: string,
  signature: string,
): boolean

body can be a string or buffer. When it's a string, it will be handled as if it's encoded in UTF-8.

For more details about signature validation of LINE webhook, please refer to the official documentation.