# tExtractJSONFields Standard properties These properties are used to configure tExtractJSONFields running in the Standard Job framework. The Standard tExtractJSONFields component belongs to the Processing family. The component in this framework is available in all Talend products. ## Basic settings | Property type | Either Built-In or Repository. | | --- | --- | | | Built-In: No property data stored centrally. | | | Repository: Select the repository file where the
properties are stored. | | Schema and Edit schema | A schema is a row description. It defines the number of fields
(columns) to be processed and passed on to the next component. When you create a Spark
Job, avoid the reserved word line when naming the
fields.

Built-In: You create and store the schema locally for this component only.
Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs.

Click Edit
schema to make changes to the schema.

Information noteNote: If you
make changes, the schema automatically becomes built-in.

View schema: choose this option to view the schema only.
Change to built-in property: choose this option to change the schema to Built-in for local changes.
Update repository connection: choose this option to change the schema stored in the repository and decide whether to propagate the changes to all the Jobs upon completion. If you just want to propagate the changes to the current Job, you can select No upon completion and choose this schema metadata again in the Repository Content window.

| | Read By | Select a way of extracting JSON data in the
file.

JsonPath: Extracts JSON data based on the JSONPath query. With this option selected, you need to select a JSONPath API version from the API version drop-down list. It is recommended to read data by JSONPath in order to gain better performance.
Xpath: Extracts JSON data based on the XPath query.

| | JSON field | List of the JSON fields to be extracted. | | Loop Jasonpath query | Enter the Jsonpath or XPath of the node on which the loop is based.

Note if you have selected Xpath from the Read by drop-down list, the Loop
Xpath query field is displayed instead. | | Mapping | Complete this table to map the columns defined in the schema to the
corresponding JSON nodes.

Column: The Column cells are automatically filled with the defined schema column names.
Json query/JSONPath query: Specify the JSONPath node that holds the desired data. For more information about JSONPath expressions, see http://goessner.net/articles/JsonPath/.

This column is available only when JsonPath is selected from the Read By list.
XPath query: Specify the XPath node that holds the desired data.

This column is available only when Xpath is selected from the Read By list.
Get Nodes: Select this check box to extract the JSON data of all the nodes or select the check box next to a specific node to extract the data of that node.

This column is available only when Xpath is selected from the Read By list.
Is Array: select this check box when the JSON field to be extracted is an array instead of an object.

This column is available only when Xpath is selected from the Read By list.

| | Die on error | Select the check box to stop the execution of the Job when an error
occurs.

Clear the check box to skip any rows on error and complete the process for
error-free rows. When errors are skipped, you can collect the rows on error using a Row > Reject link. | ## Advanced settings | Use the loop node as root | Select this check box to use the loop node as the root for querying the file.

The loop node is set in the Loop Json query text frame
in the Basic Settings view. If this option is checked,
only the child elements of the loop node are available for querying; otherwise,
both the parent elements and the child elements of the loop node can be
queried. You can specify a parent element through JSON path syntax.

This check box is available only when JsonPath is
selected in the Read By drop-down list of the
Basic settings view. | | --- | --- | | Encoding | Select the encoding from the list or select Custom
and define it manually. This field is compulsory for database data handling. The
supported encodings depend on the JVM that you are using. For more information, see
[https://docs.oracle.com](https://docs.oracle.com/). | | tStatCatcher Statistics | Select this check box to gather the Job processing metadata at a Job
level as well as at each component level. | ## Global Variables | NB\_LINE | The number of rows processed. This is an After variable and
it returns an integer. | | --- | --- | | ERROR\_MESSAGE | The error message generated by the component when an error
occurs. This is an After variable and it returns a string. This variable
functions only if the Die on error
check box is selected. | ## Usage | **Usage rule** | This component is an intermediate component. It needs an input and an
output components. | | --- | --- | | Limitation | Due to license incompatibility, one or more JARs required to use
this component are not provided. You can install the missing JARs for this particular
component by clicking the Install button
on the Component tab view. You can also
find out and add all missing JARs easily on the Modules tab in the
Integration
perspective of your studio. For
details, see *Installing external modules*.
You can find more details about how to install external modules in
Talend Help Center ([https://help.talend.com](https://help.talend.com/)). |