decode json web token code example

Example 1: decode csrf token online

{
  "alg": "CfDJ8OW5OI0CPGJBgSNlGwO0x4YF7qbYKVv7KOO-N0eFtDUzXOrL7F9Xd9W1otVi4ueJOkAmAhuoHFWNkqRaFD7zvAMHMSKncl6Vo5QXKmpvy6vqxOKxSURdIey8aZPRi3Nnhp2p9la-Al5xrVKz0lignRdcCHf3O7pF9zv_sNx_c_T7pUe3WsxaJEPX3t_9FO2Wjw"
}

Example 2: decode jwt tokens

let b64DecodeUnicode = str =>
  decodeURIComponent(
    Array.prototype.map.call(atob(str), c =>
      '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)
    ).join(''))

let parseJwt = token =>
  JSON.parse(
    b64DecodeUnicode(
      token.split('.')[1].replace('-', '+').replace('_', '/')
    )
  )

Example 3: jwt

JSON Web Token is an Internet standard for creating data with optional
signature and/or optional encryption whose payload holds JSON that asserts
some number of claims.

The tokens are signed either using a private secret or a public/private key.

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