Read json file content with require vs fs.readFile

Question

Suppose that for every response from an API, i need to map the value from the response to an existing json file in my web application and display the value from the json. Wh

Answer 1

If your file is empty, require will break. It will throw an error:

SyntaxError ... Unexpected end of JSON input.

With readFileSync/readFile you can deal with this:

let routesJson = JSON.parse(fs.readFileSync('./routes.json', 'UTF8') || '{}');

or:

let routesJson
fs.readFile('./dueNfe_routes.json', 'UTF8', (err, data) => {
    routesJson = JSON.parse(data || '{}');
});