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javascriptでobjectをjson(文字列)にする

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単純に JSON.stringify で良いじゃんっていう記事が多いけどできないことがあったので別解。

const obj = {a: 2, b: 3, c: 5, d:{"x":200,"v":300,"z":800}};
const json = JSON.stringify(Object.fromEntries(Object.entries(obj)));
//{"a":2,"b":3,"c":5,"d":{"x":200,"v":300,"z":800}}
JSON.parse(json).d.v;
//300

toSource とかも出てきたので非推奨で廃止済みなので論外。

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