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Overview

The JSON_EXTRACT_PATH_TEXT() function extracts JSON nested value from a specified JSON value according to the defined path.
This function may be similar to the JSON_EXTRACT_PATH(). This function returns a value of type text instead of type JSON.

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Syntax

The JSON_EXTRACT_PATH_TEXT() syntax is shown below: 
JSON_EXTRACT_PATH_TEXT(from_json JSON, path TEXT[])
The required arguments are explained below.
  • from_json: the JSON value to extract.
  • path: the path to extract.

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Another Option

Besides the syntax above, Oxla provides and supports the use of operators in queries. See the syntax below: 
SELECT 'from_json'::JSON ->> 'path';
  • from_json: the JSON value from which to extract.
  • ::JSON: a symbol that casts the text literal to a JSON type.
  • path: key of the field that we want to extract.

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Example

  1. This example shows how to use the JSON_EXTRACT_PATH_TEXT() function to extract values ​​from a JSON object at a specified index.
Run the following query: 
SELECT JSON_EXTRACT_PATH_TEXT('{"a": "Oxla", "b": {"x": 1.234, "y": 4.321}}', 'a') AS "result a";
or 
SELECT '{"a": "Oxla", "b": {"x": 1.234, "y": 4.321}}'::JSON ->> 'a' AS "result a";
  1. The JSON\_EXTRACT\_PATH\_TEXT() function extracts the values and returns the output below:
+------------+
| result a   |
+------------+
| "Oxla"     |
+------------+