How to update version in package.json [duplicate]

Question

I need to update the version by reading it from package J SON file which will be 1.1.1. After reading i need to append the build number with it like 1.1.1-1 and then i want to update the version field within the package J SON file. How i can achieve it?

Thanks

Answer 1

You can use fs.readFile() and fs.writeFile() to read and edit the package.json file.

append-build-to-version.js:

var fs = require('fs');

fs.readFile('./package.json', (err, data) => {
    if (err) throw err;

    var packageJsonObj = JSON.parse(data);
    var build = 5; // get this from somewhere or increment the last char
    var versionNumber = packageJsonObj.version;
    packageJsonObj.version = `${versionNumber}-${build}`;
    packageJsonObj = JSON.stringify(packageJsonObj);

    fs.writeFile('./package.json', packageJsonObj, (err) => {
        if (err) throw err;
        console.log('The file has been saved!');
    });
});

package.json:

{
    "name": "teststackoverflow",
    "version": "1.0.0-5",
    "description": "",
    "main": "router.js",
    "dependencies": {},
    "devDependencies": {},
    "scripts": {
        "test": "echo \"Error: no test specified\" && exit 1"
    },
    "author": "",
    "license": "ISC"
}

More info on fs.readFile() and fs.writeFile() can be found in the Node.js documentation.

Answer 2

You can use npm version <YOUR VERSION>

To increment versions use:

npm version major for major versions and

npm version minor For minor versions and

npm version patch For bug fixes