Logto.io - getCustomJwtClaims: Set up custom claims in the access token. These claims can be used to pass additional information to your application.

logto-getCustomJwtClaims.js

/**
* logto.io
* This function is called during the access token generation process to get custom claims for the JWT token.
* Limit custom claims to under 50KB. It requests custom claims to an api configured by 2 environment variables: 
* apiKey and apiUrl
*
* @param {Object} payload - The input payload of the function.
* @param {AccessTokenPayload} payload.token -The JWT token.
* @param {Context} payload.context - Logto internal data that can be used to pass additional information
* @param {EnvironmentVariables} [payload.environmentVariables] - The environment variables.
*
* @returns The custom claims.
*/
const getCustomJwtClaims = async ({ token, context, environmentVariables }) => {
  const { apiKey, apiUrl } = environmentVariables;
  const body = JSON.stringify({token: token, context:context});

  const jsonPayload = await fetch(
    `${apiUrl}/v1/users`,
    {
      method:"POST",
      body: body,
      headers: {
        "Content-Type": "application/json;charset=UTF-8",
        "Authorization": apiKey
      },
    }
  ).then( response => {
    if (!response.ok) {
      throw new Error(`Invalid response`);
    }
    return response.json();
  });

  return jsonPayload.data;
};