JSON_EXTRACT_PATH_TEXT

This article will help you to understand the JSON_EXTRACT_PATH_TEXT() to extract JSON nested value from a specified JSON value.

Overview

The JSON_EXTRACT_PATH_TEXT() function extracts JSON nested value from a specified JSON value according to the defined path.

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.

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 string literal to a JSON type.
• path: key of the field that we want to extract.

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";

2) The JSON_EXTRACT_PATH_TEXT() function extracts the values and returns the output below:

+------------+
| result a   |
+------------+
| "Oxla"     |
+------------+