Multiple Runs on a Single URL

I have been trying to write a script that allows me to pass in a list of URLs run each URL multiple times, collect the data grab the find the median for each URL then write out to a separate HTML/JSON file the processed data from the batch runs. With the script in its early stages I still can’t seem to get a successful run. It is giving me a

SyntaxError: Unexpected end of JSON input at JSON.parse (<anonymous>) at Object.<anonymous> (.\Lighthouse\runLighthouseMulti.js:20:25)

This is my current code

`#!/usr/bin/env node

const spawnSync = require(‘child_process’).spawnSync; const lighthouseCli = require.resolve(‘./lighthouse/lighthouse-cli’); let urls = require(‘./Lighthouse/urls.json’); // The file where your list of urls lives let runs = 0

for (const url of urls) { // console.log(url.url); console.log(Running performance test ${runs + 1}); // Logs this to the console just before it kicks off try { const { status = -1, stdout } = spawnSync(‘node’, [lighthouseCli, ‘https://www.example.com’, ‘–config-path=“./Lighthouse/custom-config.js”’, --chrome-flags="--headless --user-agent='Custom'", ‘–emulated-form-factor none’, ‘–output=json’ ]); // Executes this on the command line to run the performance test console.log(stdout.toString()); console.log(JSON.parse(stdout)); } catch(err) { console.log(err) console.log(Performance test ${runs + 1} failed); // If Lighthouse happens to fail it’ll log this to the console and log the error message break; } console.log(Finished running performance test ${url.fileName} ${runs + 1}); // Logs this to the console just after it finishes running each performance test runs++; } console.log(All finished);`

[connorjclark]

https://github.com/GoogleChrome/lighthouse/blob/master/docs/variability.md#run-lighthouse-multiple-times / https://github.com/GoogleChrome/lighthouse#related-projects

[patrickhulce]

We’re going to go ahead and close this out as there’s no action for Lighthouse to take here. Further direct questions might be better served by the community at Stack Overflow 😃