json_agg_strict() — PostgreSQL aggregate aggregate function

json_agg_strict(): aggregate input into json. PostgreSQL aggregate functions — signature, volatility, version applicability and an illustrative example.

The Sev-1 Admin
The Sev-1 Admin  ·  1 min read

Summary

json_agg_strict is a PostgreSQL built-in aggregate function in the Aggregate Functions group. PostgreSQL’s system catalog (pg_proc) describes it as: “aggregate input into json”.

Signature

json_agg_strict(anyelement) → json

Argument and return types are taken from the pg_proc catalog; internal type names are shown using their readable SQL spellings (for example int4 is shown as integer). (Derived from the catalog — see the linked reference for the canonical documentation.)

Classification

  • Category: Aggregate Functions
  • Kind: Aggregate function
  • Volatility: STABLE — Marked STABLE — within a single statement it returns a consistent result for the same arguments, but the result can change between statements.
  • Returns: json

Example

Illustrative form (replace placeholder values with your own data):

SELECT json_agg_strict(col) FROM your_table;

The example above is illustrative and is meant to show calling syntax only; consult the linked PostgreSQL documentation for exact semantics, edge cases and accepted argument combinations.

Version applicability

Based on the catalog across releases, json_agg_strict first appears in PostgreSQL 16. It is present in: 16, 17, 18, 19.

Related & references

Reference: PostgreSQL documentation — Aggregate Functions.