upstash/redis returns big integers as strings: the 2^53 - 1 JavaScript limit

@upstash/redis returns large numbers as strings

What you see

await redis.set("key", "101600000000150081467"); const res = await redis.get("key"); // res is the string "101600000000150081467", not a number

Why

JavaScript numbers are doubles. Above 2^53 - 1 they lose precision, so the SDKs deserializer returns big integers as strings rather than silently corrupting them. Your data is intact; the type changed.

Fix

• Treat IDs, Snowflake IDs, and big counters as strings end to end.
• Convert explicitly with BigInt where you need arithmetic.

• If you have TypeScript types declaring these fields as number, change them to string or BigInt: the mismatch is in your types, not in Redis.

Verify

Round trip a known big integer and compare as strings. Exact match means everything is working as designed.

Verified against Upstash TS SDK troubleshooting docs: JavaScript cannot handle numbers larger than 2^53-1 safely, so the default deserializer returns them as strings. Source: https://upstash.com/docs/redis/sdks/ts/troubleshooting