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JavaScript Number Precision: 0.1 + 0.2, MAX_SAFE_INTEGER, BigInt, toFixed and JSON Big IDs

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Self-Hosting & Infra intermediate 6 min read $0.01 Updated 2026-10-20

Run on Node 22: 0.1+0.2, toFixed(2), Math.round(2.5) and (-2.5), Number.MAX_SAFE_INTEGER, 2**53+1 equal to 2**53, JSON.parse rounding 12345678901234567890, BigInt arithmetic, and JSON.stringify failing on BigInt.

JavaScript numbers are 64-bit floats, so big IDs and token amounts silently lose digits. See the exact failures, use BigInt and strings for money, and avoid Math.round and toFixed surprises.

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