Postman: Write response values back to environment vars

postman_set_env.js

// Place the following in the "Tests" tab of a request

// Check HTTP status code 
tests['Status 200'] = responseCode.code === 200;

// We need valid JSON
var validJSON = false;
var resData = {};
try {
    resData = JSON.parse(responseBody);
    validJSON = true;
} catch (e) {
    console.log({err: e});
}
tests['Valid JSON Response'] = validJSON;
if (!validJSON) {
    return postman.setNextRequest(null);
}

// extract values "token" and "user"
var jwtTokenField = resData.token;
var user = resData.user;

tests['jwt token field found'] = (jwtTokenField !== null);
if (jwtTokenField !== null) {
    // write token value to environment var jwt
    postman.setEnvironmentVariable("jwt", "Bearer "+jwtTokenField);
} else {
    postman.setNextRequest(null);
}

tests['user field found'] = (user !== null);
if (user !== null) {
    // write user.id to environment var userId
    postman.setEnvironmentVariable("userId", user.id);
} else {
    postman.setNextRequest(null);
}