I'm new to JavaScript and JSON and I'm trying to upload my NPM package. For some reason, I get this error when I try to publish it:

Unexpected token } in JSON at position 351 while parsing near '..."license": "ISC",

},
"bugs": {
"e..."

Here's my JSON file.

{
"name": "M-P-Formulas-JS",
"version": "1.0.0",
"description": "The M-P-Formulas package for JavaScript. This package allows the user to use math and physics formulas such as the Pythagorean Theorem.",
"main": "mpformulasJS.js",
"author": {
    "email": "[email protected]",
    "name": "Jeff Lockhart",
    "url": "",
    "license": "ISC",
},
"bugs": {
    "email": "[email protected]",
},
"dependencies": {
    "Math": "",
},
"keywords": [
    "mpformulas",
    "mpformulasjs",
    "m-p-formulas-js",
    "math",
    "physics",
    "formulas",
    "module",
    "package",
 ],
}

I even ran npm cache clean but, since it did not work, I can assure that my code is wrong. If so, how can I solve this?

Thank you.

I'm new to JavaScript and JSON and I'm trying to upload my NPM package. For some reason, I get this error when I try to publish it:

Unexpected token } in JSON at position 351 while parsing near '..."license": "ISC",

},
"bugs": {
"e..."

Here's my JSON file.

{
"name": "M-P-Formulas-JS",
"version": "1.0.0",
"description": "The M-P-Formulas package for JavaScript. This package allows the user to use math and physics formulas such as the Pythagorean Theorem.",
"main": "mpformulasJS.js",
"author": {
    "email": "[email protected]",
    "name": "Jeff Lockhart",
    "url": "",
    "license": "ISC",
},
"bugs": {
    "email": "[email protected]",
},
"dependencies": {
    "Math": "",
},
"keywords": [
    "mpformulas",
    "mpformulasjs",
    "m-p-formulas-js",
    "math",
    "physics",
    "formulas",
    "module",
    "package",
 ],
}

I even ran npm cache clean but, since it did not work, I can assure that my code is wrong. If so, how can I solve this?

Thank you.

• javascript
• json
• node.js
• npm

• Remove the trailing ma after the keywords array. Remove every trailing ma – lleon Commented Jan 2, 2018 at 15:05
• What code is wrong? Where is your code? – Ramesh Rajendran Commented Jan 2, 2018 at 15:06
• JSON does not allow trailing mas after the last element of an array. – Joe Clay Commented Jan 2, 2018 at 15:06
• Actually, remove the trailing ma after each last line one an object or array. I can see at least 5. – jcaron Commented Jan 2, 2018 at 15:06
• All the stray trailing mas are syntax errors in JSON. – Pointy Commented Jan 2, 2018 at 15:06

3 Answers 3

Remove the extra ma because it's the last item before closing the object. It results in an invalid JSON.

"license": "ISC", // <--- Remove this ma

"bugs": {
    "email": "[email protected]", // <--- Remove this ma
}

JS objects and JSON are different. For instance, this is a valid JS object, but invalid JSON :

bugs : {
    email : "[email protected]",
}

Valid JSON would be :

"bugs": {
    "email": "[email protected]"
}

Remove the mas preceeding the closing braces and brackets. Use a ma only to separate elements. The last element should not have a trailing ma. Some parsers will let you get away with this but it's invalid JavaScript and JSON.

Here a tool for testing JSON formatting.

{
"name": "M-P-Formulas-JS",
"version": "1.0.0",
"description": "The M-P-Formulas package for JavaScript. This package allows the user to use math and physics formulas such as the Pythagorean Theorem.",
"main": "mpformulasJS.js",
"author": {
    "email": "[email protected]",
    "name": "Jeff Lockhart",
    "url": "",
    "license": "ISC",              <-- Lose the ma.
},
"bugs": {
    "email": "[email protected]", <-- Lose the ma.
},
"dependencies": {
    "Math": "",                    <-- Lose the ma.
},
"keywords": [
    "mpformulas",
    "mpformulasjs",
    "m-p-formulas-js",
    "math",
    "physics",
    "formulas",
    "module",
    "package",                     <-- Lose the ma.
 ],                                <-- Lose the ma.
}

Your JSON have unwanted , in end of the objects. So please try this below code to remove the , after the last item of every objects.

var xx={
"name": "M-P-Formulas-JS",
"version": "1.0.0",
"description": "The M-P-Formulas package for JavaScript. This package allows the user to use math and physics formulas such as the Pythagorean Theorem.",
"main": "mpformulasJS.js",
"author": {
    "email": "[email protected]",
    "name": "Jeff Lockhart",
    "url": "",
    "license": "ISC",
},
"bugs": {
    "email": "[email protected]",
},
"dependencies": {
    "Math": "",
},
"keywords": [
    "mpformulas",
    "mpformulasjs",
    "m-p-formulas-js",
    "math",
    "physics",
    "formulas",
    "module",
    "package",
 ],
}

var xxx=JSON.parse(JSON.stringify(xx).replace('",]','"]').replace('",}','"}'));
console.log(xxx);