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Start script missing error when running npm start

由 拟墨画扇 提交于 2019-11-27 02:43:44

It looks like you might not have defined a start script in your package.json file or your project does not contain a server.js file.

If there is a server.js file in the root of your package, then npm will default the start command to node server.js.

https://docs.npmjs.com/misc/scripts#default-values

You could either change the name of your application script to server.js or add the following to your package.json

"scripts": {
    "start": "node your-script.js"
}

Or ... you could just run node your-script.js directly

This error also happens if you added a second "script" key in the package.json file. If you just leave one "script" key in the package.json the error disappears.

Дмитрий Дорогонов

In my case, it wasn't working because I used "scripts" twice. After combining - it is ok.

"scripts": {
  "test": "make test",
  "start": "node index.js"
}
Ray

Please use the below line of code in script object which is there in package.json

"scripts": {
    "start": "webpack-dev-server --hot"
}

For me it worked perfectly fine.

If you have are using babelify and watchify, go to:

package.json

and add this in "scripts":

"scripts": {
    "start": "watchify the-path-to-your-source-jsx-file -v -t [ babelify --presets [ react ] ] -o the-path-to-your-output-js-file"
}

An example would be:

"scripts": {
    "start": "watchify src/main.jsx -v -t [ babelify --presets [ react ] ] -o public/js/main.js"
}

Thanks to Mark Price from DevSlopes

Make sure the PORTS ARE ON 

var app = express();
app.set('port', (process.env.PORT || 5000));

BLAL BLA BLA AND AT THE END YOU HAVE THIS

app.listen(app.get('port'), function() {
    console.log("Node app is running at localhost:" + app.get('port'))
});

Still a newbee in node js but this caused more of this.

check package.json file having "scripts" property is there or not. if not update script property like this

{
  "name": "csvjson",
  "version": "1.0.0",
  "description": "upload csv to json and insert it into MongoDB for a single colletion",
  "scripts": {
    "start": "node csvjson.js"
  },
  "dependencies": {
    "csvjson": "^4.3.4",
    "fs": "^0.0.1-security",
    "mongodb": "^2.2.31"
  },
  "devDependencies": {},
  "repository": {
    "type": "git",
    "url": "git+https://github.com/giturl.git"
  },
  "keywords": [
    "csv",
    "json",
    "mongodb",
    "nodejs",
    "collection",
    "import",
    "export"
  ],
  "author": "karthikeyan.a",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/homepage/issues"
  },
  "homepage": "https://github.com/homepage#readme"
}

I have solved mine. Its not an NPM Error its related to proxy behavior.

If you are behind proxy,

MAC
 1.  Goto System Preference (gears icon on your mac)
 2.  click your network
 3.  click advanced
 4.  click proxy
 5.  check excludes simple hostnames
 6.  add this line below (Bypass Proxy Settings...) "localhost, localhost:8080"

refer to the npm echo: "Project is running at http://localhost:8080/"

Windows
 1.  Goto your browser Proxy Settings (google it)
 2.  check Bypass local address
 3.  add this line below "localhost, localhost:8080"

should avoid using unstable npm version.

I observed one thing that is npm version based issue, npm version 4.6.1 is the stable one but 5.x is unstable because package.json will be configured perfectly while creating with default template if it's a stable version and so we manually don't need to add that scripts.

I got the below issue on the npm 5 so I downgraded to npm 4.6.1 then its worked for me,

ERROR: npm 5 is not supported yet

It looks like you're using npm 5 which was recently released.

Create React Native App doesn't work with npm 5 yet, unfortunately. We recommend using npm 4 or yarn until some bugs are resolved.

You can follow the known issues with npm 5 at: https://github.com/npm/npm/issues/16991

Devas-MacBook-Air:SampleTestApp deva$ npm start npm ERR! missing script: start

If you are running two application same time , close one and then build and run application

Ankita Singh
"scripts": {
  "prestart": "npm install",
  "start": "http-server -a localhost -p 8000 -c-1"
}

add this code snippet in your package.json, depending on your own configuration.

kbooth1000

Another possible reason: you're using npm when your project is initialized in yarn. (I did this myself). So it would be yarn start instead of npm start.

I have the same issue. I try to write a code in package.json file as below

    "scripts": {
    "start": "<your-script-file>.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
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javascript
node.js
express
package.json
npm-scripts
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