How to get identity id from cognito with jwt token

lambda-get-identity-id.js

// npm install await-to-js

const { to } = require("await-to-js");
const { CognitoIdentity } = require("aws-sdk");
const identity = new CognitoIdentity();

const IDENTITY_POOL_ID = "<your identity pool id>";

exports.handler = async (event) => {
  const { issuer } = event.identity;
  const { authorization } = event.request.headers;

  const [error, identityId] = await getId(authorization, issuer);
  
}

const getId = async (jwtToken, issuer) => {
  const [error, result] = await to(
    identity
      .getId({
        IdentityPoolId: IDENTITY_POOL_ID,
        Logins: { [issuer.replace("https://", "")]: jwtToken },
      })
      .promise()
  );
  if (error) return [error];

  return [null, result.IdentityId];
};

Thank you! This was really helpful!

You're welcome!