PostgreSQL 22030 Error: Causes and Solutions Complete Guide

📰 Dev.to · umzzil nng

Learn to troubleshoot and fix PostgreSQL error 22030 caused by duplicate JSON object key values, and understand how to prevent it in your database operations, which is crucial for maintaining data integrity and ensuring smooth application performance.

intermediate Published 16 Jun 2026

Action Steps

Identify the source of the error by checking the SQL query or external data insertion that triggered the error 22030.
Use the `jsonb_build_object()` function correctly by avoiding duplicate keys or using distinct key names.
Cast external JSON strings with duplicate keys to `jsonb` to auto-merge duplicate keys, ensuring data consistency.
Apply safe insertion patterns for external data to prevent errors.
Review and adjust aggregation queries using `json_object_agg()` to handle duplicate keys appropriately.

Who Needs to Know This

Database administrators, developers, and data engineers benefit from understanding how to resolve this error, as it directly impacts the reliability and efficiency of their PostgreSQL databases and applications.

Key Insight

💡 Preventing duplicate keys in JSON objects is key to avoiding error 22030, and using the right PostgreSQL functions and data types can help mitigate this issue.