JSON
Expanding JSONB Into Typed Rows With jsonb_to_recordset
Turn a JSONB array of objects into typed SQL columns with jsonb_to_recordset, jsonb_populate_recordset and jsonb_each, with the errors and edge cases.
7 min read
Library
Everything you need to level up your coding skills.
JSON
Querying Arrays Inside JSONB With jsonb_array_elements
Search, count, filter and rebuild JSON arrays inside PostgreSQL JSONB, from containment tests to jsonb_array_elements, with timings for five tag lookups.
8 min read
JSON
Indexing JSONB With GIN in PostgreSQL and When It Helps
Build GIN indexes on JSONB, choose between jsonb_ops and jsonb_path_ops, and see the real size, build, insert and query costs on a 200,000-row table.
8 min read
JSON
Adding and Removing Keys From JSONB With jsonb_set and Minus
Add, rename, merge and delete keys and array elements in PostgreSQL JSONB with jsonb_set, jsonb_insert, || and minus, and see where each does nothing.
8 min read
JSON
Updating One Key Inside a JSONB Column Without Losing Data
Change a single field in a PostgreSQL JSONB document with jsonb_set or subscripts, increment a counter, and avoid the lost-update and rewrite costs.
8 min read
JSON
Extracting Nested JSONB Values With Path Operators
PostgreSQL reads deep JSONB values with #> and #>>, and filters with jsonpath. How array paths, missing keys, strict mode and wildcards actually behave.
8 min read
JSON
Querying JSONB With the Arrow Operators in PostgreSQL
How -> and ->> read keys and array elements in PostgreSQL JSONB, what comes back for missing keys, and the precedence and casting traps that bite.
8 min read
XMLGuide
Converting XML to JSON CSV YAML and Excel Without Data Loss
One XML file converted to JSON, CSV, YAML and Excel with one parse and four writers, what each target loses, and how to prove nothing went missing.
20 min read
JSON
JSON Versus JSONB in PostgreSQL and Which to Store
PostgreSQL has two JSON types. What each keeps, drops and costs, measured on 200,000 rows, and the narrow cases where plain json is the right choice.
7 min read
JSONGuide
Working With JSONB in PostgreSQL From First Query to Index
A working guide to JSONB in PostgreSQL 18: reading, filtering, updating, unnesting and aggregating documents, then GIN and expression indexes, with timings.
21 min read
JSON
Fixing JSON That Is Really a JavaScript Object Literal
Text copied from console.log, DevTools or a config file is often a JavaScript object, not JSON. What differs, what is lost, and how to convert it safely.
7 min read
JSON
Repairing Truncated JSON From a Cut Off Response or File
A response or file that stops mid-document fails with an end-of-input error. How to confirm truncation, salvage complete records and decide on repair.
8 min read
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