postgresql-json

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Work with JSONB data - queries, indexing, transformations

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Sourcepluginagentmarketplace/custom-plugin-postgresql

Added on2026-02-10

NPX Install

npx skill4agent add pluginagentmarketplace/custom-plugin-postgresql postgresql-json

SKILL.md Content

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PostgreSQL JSON Skill

Atomic skill for JSONB operations

Overview

Production-ready patterns for JSONB queries, indexing, and transformations.

Prerequisites

PostgreSQL 16+
Understanding of JSON structure

Parameters

yaml

parameters:
  operation:
    type: string
    required: true
    enum: [query, index, transform, aggregate]
  json_path:
    type: string

Quick Reference

JSONB Operators

Operator	Description	Example
`->`	Get object	`data->'user'`
`->>`	Get as text	`data->>'name'`
`@>`	Contains	`data @> '{"active":true}'`
`?`	Key exists	`data ? 'email'`

Index Patterns

sql

CREATE INDEX idx_data ON t USING GIN(data);  -- Containment
CREATE INDEX idx_data_path ON t USING GIN(data jsonb_path_ops);  -- Faster @>
CREATE INDEX idx_status ON t ((data->>'status'));  -- Specific key

Common Operations

sql

-- Nested update
UPDATE docs SET data = jsonb_set(data, '{user,verified}', 'true');

-- Array append
UPDATE docs SET data = jsonb_set(data, '{tags}', (data->'tags') || '"new"');

-- Aggregate
SELECT jsonb_agg(jsonb_build_object('id', id, 'name', name)) FROM users;

Troubleshooting

Error	Cause	Solution
`22P02`	Invalid JSON	Validate syntax
Slow @>	No GIN index	Create GIN index
NULL path	Key missing	Check with ?

Usage

Skill("postgresql-json")