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<pre class="shiki github-dark shaku"><code>function stringify(data) { // Handle null, NaN, Infinity, and -Infinity if ([null, NaN, Infinity, -Infinity].includes(data)) return 'null'; // Handle undefined in objects and arrays (they are excluded in JSON.stringify) if (data === undefined) return undefined; switch (typeof data) { case 'bigint': throw new TypeError('BigInt is not supported in JSON'); case 'number': case 'boolean': return String(data); // Convert number or boolean to string case 'string': return `"${data}"`; // Escape string with quotes case 'symbol': case 'function': return undefined; // Functions and symbols are not serialized case 'object': { // Date handling if (data instanceof Date) { return `"${data.toISOString()}"`; // Convert Date to ISO string } // Array handling if (Array.isArray(data)) { return `[${data.map(item =&gt; stringify(item) || 'null').join(',')}]`; // Handle array elements } // Object handling return `{${Object.entries(data).map(([key, value]) =&gt; { if (value === undefined) return ''; // Omit undefined values return `"${key}":${stringify(value)}`; // Convert object key-value pairs to string }).filter(Boolean).join(',')}}`; } default: // For other types like string, number, etc., return them as string return `"${data}"`; }}</code></pre>

Simple solution

I believe you've used JSON.stringify() before, do you know the details of how it handles arbitrary data? Please have a guess on the details and then t…