PostgreSQL + JSONB
PostgreSQL with JSONB combines relational SQL with flexible JSON document storage for scraped data that needs both structure and flexibility.
PostgreSQL + JSONB is a relational SQL database option that stores structured tables and flexible JSON documents in the same system.
Key Features:
- JSONB Indexing - Index JSON fields with GIN indexes for fast queries on nested scraped data.
- SQL + Documents - Query structured and semi-structured data together in a single database.
- Containment Queries - Find documents matching complex nested patterns with the @> operator.
- Strong Consistency - ACID transactions ensure scraped data integrity across relational and JSON columns.
- Ecosystem Maturity - Leverage decades of PostgreSQL tooling, extensions, and community support.
Use PostgreSQL + JSONB when scraped data needs relational guarantees, SQL joins, and native JSON document support without introducing a separate document database.
Web scraping workflow
How to use PostgreSQL + JSONB in a web scraping pipeline
PostgreSQL's JSONB type stores structured JSON inside a relational database. It can preserve source-specific extracted attributes while ordinary columns and constraints define stable entity and collection identities.
A practical workflow
- A separate scraper emits a record with source URL, entity key, collection time and a JSON object of extracted fields.
- Validate the record, store its common fields in typed columns and keep variable attributes in JSONB; use a declared unique key and conflict policy for repeat collections.
- Query current records or an explicitly modeled observation history, joining them to collection runs when investigating a change.
When it fits
Choose this when scraped entities need transactional writes, relational joins and some flexible fields. Model current state and historical observations deliberately rather than expecting a JSON column to provide both automatically.
Boundaries
JSONB is part of PostgreSQL, not a separate NoSQL service. It does not fetch pages or validate business meaning. Index only the paths your queries need, and keep large raw captures elsewhere with references in the database.
Growing a website? Track its keywords, Google rankings, Search Console insights, and share of voice with bisibility. Free during beta.
Our productRepository
postgres/postgres
Stars
22.4KForks
6KLast commit
2026-10-15License
PostgreSQLLanguage
C
Metrics recorded 2026-10-16
Repository details
License source: Repository license file
Frequently asked questions
What is JSONB used for?
PostgreSQL’s jsonb type stores JSON values in a decomposed representation that supports querying and indexing. It is useful when records have nested or variable fields, while ordinary relational columns can hold stable fields that need their own constraints.
Sources (checked ): PostgreSQL JSON types
How do I store JSON data in PostgreSQL?
Define a column with the json or jsonb type, then insert valid JSON values through parameterized SQL or your database driver. Cast a value to jsonb when required by the expression. Choose the type according to how you will preserve, query and index the data.
Sources (checked ): PostgreSQL JSON types
Which is better for PostgreSQL, JSON or JSONB?
json preserves the input text, including whitespace, key order and duplicate keys. jsonb stores a parsed representation, does not preserve those details and supports indexing. Use jsonb for many query-oriented workloads; use json when preserving the original JSON representation matters.
Sources (checked ): PostgreSQL JSON types
Can you query JSONB in PostgreSQL?
Yes. PostgreSQL provides operators for retrieving fields and paths, containment checks and SQL/JSON path expressions. For example, -> returns a JSON value while ->> returns text. Choose operators that match the value type and any index you intend to use.
Sources (checked ): PostgreSQL JSON types; PostgreSQL JSON functions
How do I index JSONB in PostgreSQL?
GIN indexes can support jsonb containment, key-existence and supported path queries. Expression indexes can target particular nested fields. Index support depends on the operator class and query expression, and indexes add storage and update costs; inspect your actual query plan.
Sources (checked ): PostgreSQL JSON types
What are the JSONB functions available in PostgreSQL?
PostgreSQL provides jsonb_build_object to build objects from key-value pairs, jsonb_array_elements to expand an array into rows, and jsonb_set to replace or add a value at a path. Other functions extract paths, build arrays and process JSON values.
Sources (checked ): PostgreSQL JSON functions; PostgreSQL JSON types
Sources
Verified against the postgres/postgres repository.