var fs = require('fs'); console.log('Incrementing build number...'); fs.readFile('src/metadata.json',function(err,content) { if (err) throw err; var metadata = JSON.parse(content); metadata.buildRevision = metadata.buildRevision + 1; fs.writeFile('src/metadata.json',JSON.stringify(metadata),function(err){ if (err) throw err; console.log(`Current build number: ${metadata.buildMajor}.${metadata.buildMinor}.${metadata.buildRevision} ${metadata.buildTag}`); }) });