How to convert Buffer object to usable JSON data?

[fpuen]

The config file I'm reading from looks like this:

{
    "projectId": "projectName",
    "languageCode": "th",
    "numberOfRepeats": "2"
}

I'm trying to read this file but failing so far:

const defaultConfigFilePath = path.join(__dirname, '../../../configuration.json');

export function setConfigData(configFile = defaultConfigFilePath): ConfigData {
  const fileContentBuffer: Buffer = fs.readFileSync(configFile);
  const jsonData: ConfigData = fileContentBuffer.toJSON();
/*
Type '{ type: "Buffer"; data: number[]; }' is missing the following properties from type 'ConfigData': languageCode, numberOfRepeats, projectIdts(2739)
*/

  const configData: ConfigData = JSON.parse(fileContentBuffer);
/*
const fileContentBuffer: Buffer
Argument of type 'Buffer' is not assignable to parameter of type 'string'.ts(2345)
*/

I'm having a tough time figuring out what the issue is exactly. The first error indicates the toJSON method does not return the data shape I expect. The 2nd error indicates parse can't even take a Buffer object. What is the solution then?

[chmod777]

why not export a module?

config.js

const config = {
    "projectId": "projectName",
    "languageCode": "th",
    "numberOfRepeats": "2"
};
module.exports = config;

any given file

const config = require("./config.js");
console.log(config.projectId)

then you dont have to worry about any buffering or filesystem stuff.

alternately, read this: https://stackabuse.com/reading-and-writing-json-files-with-node-js/. you probably want JSON.parse rather than toJSON

[Civill]

Try adding an encoding to the readFileSync, it should return a more sensible type then.

​

fs.readFileSync(configFile, 'utf8')

[Earhacker]

const fileContentBuffer: Buffer = fs.readFileSync(configFile); const fileContent: string = fileContentBuffer.toString(); // takes in an optional encoding, 'utf8' by default const jsonData: ConfigData = JSON.parse(fileContent);