Lua

Create JWT Using HS256, HS384, or HS512

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand.

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

Lua

local chilkat = require("chilkat")

-- Demonstrates how to create an HMAC JWT using a shared secret (password).

-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

local jwt = chilkat.Jwt.new()

-- Build the JOSE header
local jose = chilkat.JsonObject.new()
-- Use HS256.  Pass the string "HS384" or "HS512" to use a different algorithm.
local success = jose:append_string("alg", "HS256")
success = jose:append_string("typ", "JWT")

-- Now build the JWT claims (also known as the payload)
local claims = chilkat.JsonObject.new()
success = claims:append_string("iss", "http://example.org")
success = claims:append_string("sub", "John")
success = claims:append_string("aud", "http://example.com")

-- Set the timestamp of when the JWT was created to now.
local curDateTime = jwt:gen_numeric_date(0)
success = claims:add_int_at(-1, "iat", curDateTime)

-- Set the "not process before" timestamp to now.
success = claims:add_int_at(-1, "nbf", curDateTime)

-- Set the timestamp defining an expiration time (end time) for the token
-- to be now + 1 hour (3600 seconds)
success = claims:add_int_at(-1, "exp", curDateTime + 3600)

-- Produce the smallest possible JWT:
jwt.auto_compact = true

local strJwt = jwt:create_jwt(jose:emit(), claims:emit(), "secret")

print(strJwt)