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I want to change string to variable, please some one help me. this is a string >> {"method":"setValue","params":{"cmd_Motor":true}}

I wan to change like this:

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Use JSON.parse()

const input = '{"method":"setValue","params":{"cmd_Motor":true}}';
const result = JSON.parse(input);
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I am not sure if I understood your question, but you can convert a string to a JSON object and you can also convert a JSON object to a string:

converting from string to json 

const myString = '{"method":"setValue","params":{"cmd_Motor":true}}';
const myJson = JSON.parse(myString);

console.log(myJson.method) // setValue
console.log(myJson.params.cmd_Motor) // true

converting from json to string 

const myJson = { method: 'setValue', params: { cmd_Motor: true } };
const myString = JSON.stringify(myJson);

console.log(myString);

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2 Comments

JSON is a string. So "converting from string to json" doesn't make sense
thank you so much, that is i want of result

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