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White Space Issue In IsAlpha() Function Of Express-validator

I am using express-validator in my project my json from the client is

{"name": "john doe"}

my express validation code is

[check('name', 'invalid name').isAlpha()]

why this code is returning invalid name while this is a string. Also I tried isString() but it is also not working it is working in the same style as isAlpha(). Error json response to the client is

{
"errors": [
    {
        "value": "john doe",
        "msg": "invalid name",
        "param": "name",
        "location": "body"
    }
]
}

does isAlpha() function consider only one word as a string

How can I fix this

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Answer

I got the answer. I used custom validation method. It resolved my issue.

[check('name').custom((value,{req})=>{
                if(isNaN(value)){
                    return true;
                }else{
                    throw new Error('invalid name')
                }
 })]
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source: stackoverflow.com
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