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to_json(anyelement) -> json: Encode a value as JSON.
to_json('string'::TEXT) => '"string"'
to_json(array['one','two','three',null]::text[]) => '["one","two","three",null]'
from_json(json) -> text: Decode a JSON-encoded value.
from_json('"string"') => 'string'
json_validate(text) -> boolean: Determine if text is valid JSON.
json_validate('{key: "value"}') => false
json_validate('{"key": "value"}') => true
json_get(json, jsonpath text) -> json: Select a single value from a JSON tree using a JSONPath expression.
json_get('[0,1,2]', '$[1]') => '1'
json_get('[0,1,2]', '$[100]') => NULL
json_get('[0,1,2]', '$[*]') => Error
json_set(json, jsonpath text, json) -> json: Set items in a JSON tree that match a JSONPath expression.
json_set('[0,1,2]', '$[1]', '"x"') => '[0,"x",2]'
json_set('[0,1,2]', '$[100]', '"x"') => '[0,1,2]'
json_set('[0,1,2]', '$[*]', '"x"') => '["x","x","x"]'
json_path(json, jsonpath text) -> setof json: Select multiple values from a JSON tree using a JSONPath expression.
json_path('[0,1,2]', '$[1]') =>
1
json_path('[0,1,2]', '$[100]') =>
json_path('[0,1,2]', '$[*]') =>
0
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json_condense(json) -> json: Re-encodes JSON to form a string with minimal length (mainly removes whitespace).
json_condense(' { "key" : "value"} ') => '{"key":"value"}'
json_condense($$ "\u266B" $$) => '"♫"' -- if encoding supports Unicode
json_get_type(json) -> json_type {'null' | 'string' | 'number' | 'bool' | 'object' | 'array'}: Get the type of a <type>json</type> value.
json_get_type('{"pi": "3.14159", "e": "2.71828"}') => 'object'
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