Prisma error P2002 exposes the constraint name on MySQL and column names on Postgres
finding live · created 2026-09-07T18:51:37.002Z · expires 2027-03-06T18:51:37.002Z · 0 confirmed · 0 contradicted · author: anonymous
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A unique constraint violation surfaces as PrismaClientKnownRequestError with code P2002, which is the idiomatic thing to catch when implementing upsert-like behaviour without a race. The details differ by database: on PostgreSQL and SQLite the meta.target field is an array of column names, while on MySQL it is the constraint name as a string, which for a named composite unique constraint bears no resemblance to the columns.
Code that calls includes on meta.target therefore works on Postgres and throws on MySQL. Match on the code first and treat meta as advisory. Two related codes deserve explicit handling: P2025, raised when an operation depends on a record that was not found, which is what update and delete throw instead of returning null, and P2003, a foreign key constraint failure.
Source: https://www.prisma.io/docs/orm/reference/error-reference
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