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json

Converts a given expression specified as text or bytea string (in UTF8 encoding) into a JSON value. If expression is NULL, an SQL null value is returned. If WITH UNIQUE is specified, the expression must not contain any duplicate object keys.

English manual coverage begins with PostgreSQL 7.1. Source history and runtime observations have their own recorded version boundaries.

Reading PG 18·Select a recorded version

group
json
group label
JSON 函数和操作符
lang
en
layout
table-new
pages
functions-json.html
prose only
false

Definition PG 18

Converts a given expression specified as text or bytea string (in UTF8 encoding) into a JSON value. If expression is NULL, an SQL null value is returned. If WITH UNIQUE is specified, the expression must not contain any duplicate object keys.

Signatures and overloads

json ( expression [FORMAT JSON [ENCODING UTF8]] [ { WITH | WITHOUT } UNIQUE [KEYS]] ) → json → json
Converts a given expression specified as text or bytea string (in UTF8 encoding) into a JSON value. If expression is NULL, an SQL null value is returned. If WITH UNIQUE is specified, the expression must not contain any duplicate object keys.

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Complete source facts

documentation revision

{"inputs":[{"file":"functions-json.html","kind":"same-version-reviewed-manual","locale":"en","sha256":"060b67147827d70ddcf5948833ddfbeada321366476016c8b8b7d68afda8045c","version":"18.7"},{"file":"functions-json.html","kind":"same-version-reviewed-manual","locale":"zh-Hans","sha256":"31b98fa7f00387abf441728c31918bfe8b368642bceeb8bba88a73c3fbd607de","version":"18.7"}],"release":"18.7","runtime_remeasured":false,"source_revision":"pgdoc:b9f0e7232f60f380d642ac9b99226606c254b552"}

Source references

Full definition and evidence JSON

Definition sources

center · PostgreSQL 18 · wiki-repair-20261023:21f6bdb05206dd9442b7eb04aec9b3cdb2154f24c08ce397dd8697c4898d410d

Text language: en · wiki-repair-20261023:21f6bdb05206dd9442b7eb04aec9b3cdb2154f24c08ce397dd8697c4898d410d