SubhanUllah Posted October 5, 2022 Report Posted October 5, 2022 Try to parse it and catch any failure. There isn’t a more fool-proof way to check if JSON is valid than that. Something like this would work: function isValidJSON(s) { try { JSON.parse(s); return true; } catch (e) { } return false; } // Run a few test cases: console.log(`isValidJSON("4") = ${isValidJSON("4")}`); // prints true console.log(`isValidJSON("[4") = ${isValidJSON("[4")}`); // prints false console.log(`isValidJSON("[4]") = ${isValidJSON("[4]")}`); // prints true Quote
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