jsmn_token_decode¶

Synopsis¶

int jsmn_token_decode(
    jsmn_token_decode_s*,
    const char* secret,
    JSMN_ALG,
    const char*,
    uint32_t);

Convert a JSON Web Token in dot notation format into JSON data. Internally this routine will check to make sure the JWT header algorithm matches the algorithm argument. It will also verify the signature with callers secret key.

Parameters¶

Parameter	Description
jsmn_token_decode_s *token	A context to manage decoder state
const char *secret	A key of appropriate length per your signing algorithm
JSMN_ALG alg	An algorithm for to sign token with
const char *jwt	JWT string in dot notation format
uint32_t len	Length of JWT string

Examples¶

Decode some token

const char *jwt = \
   "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9."\
   "eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ."\
   "SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c";

int err;
jsmn_token_decode_s token;

// Decode and validate token
err = jsmn_token_decode(&token, "your-256-bit-secret", JSMN_ALG_HS256, jwt, strlen(jwt));