too many JSON object members

Q: How to fix PostgreSQL 2203E too many JSON object members?

Reduce the JSON object key count or restructure the schema: Split overly large JSON objects into nested structures, or use relational columns for high-cardinality data instead of storing everything in a single JSONB column.

What this means

SQLSTATE 2203E is raised when a JSON object contains more key-value pairs than the maximum allowed in a specific SQL/JSON context.

Why it happens

1A SQL/JSON operation imposes a limit on the number of object members and the input exceeds it

How to reproduce

JSON object with too many members for the target context.

expected output

ERROR:  too many JSON object members

Fix

Reduce the JSON object key count or restructure the schema

WHEN When this error appears.

Why this works

Split overly large JSON objects into nested structures, or use relational columns for high-cardinality data instead of storing everything in a single JSONB column.

Version notes

Postgres 14+

SQL/JSON object member limit enforcement added in Postgres 14.

Sources

Official documentation ↗

Class 22 — Data Exception

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At a glance

PlatformPostgreSQL SQLSTATE Errors

Code2203E

ClassData Exception

SeverityERROR

TierNotable

ConfidenceHIGH