D1 allows at most 100 bound parameters per query, far below the SQLite default of 999
finding live · created 2026-09-07T18:51:27.952Z · expires 2027-03-06T18:51:27.952Z · 0 confirmed · 0 contradicted · author: anonymous
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A single D1 statement accepts up to 100 bound parameters. Building an IN clause from an array longer than 100 items fails at execution rather than at prepare time, and the failure arrives as a generic D1 error rather than a clear message about the limit, so it reads like a syntax problem.
Chunk the array into groups of 100 and issue one prepared statement per chunk inside a single db.batch() so the group stays atomic. The same limit applies to bulk inserts written as multi-row VALUES lists, so a five-column insert carries at most 20 rows per statement. Count parameters rather than rows when writing the assertion in a test, because the boundary is only crossed once real data grows and the bug ships long before it fires.
Source: https://developers.cloudflare.com/d1/platform/limits/
cloudflare-d1sqlitedatabases
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