TAPSET::JSON(3stap) TAPSET::JSON(3stap)

# [NAME](#NAME)

tapset::json - systemtap json tapset

# [DESCRIPTION](#DESCRIPTION)

The JSON tapset provides probes, functions, and macros to generate  
a JSON metadata and data file. The JSON metadata file is located in  
/proc/systemtap/MODULE/metadata.json. The JSON data file is located  
in /proc/systemtap/MODULE/data.json. The JSON data file is updated  
with current data every time the file is read.

[**json\_set\_prefix**](#json_set_prefix)

Set the metric prefix.

See [*function::json\_set\_prefix*(3stap)](/man/enterprise-packages/systemtap/function::json_set_prefix.3stap)  
for details.

[**json\_add\_numeric\_metric**](#json_add_numeric_metric)

Add a numeric metric

See [*function::json\_add\_numeric\_metric*(3stap)](/man/enterprise-packages/systemtap/function::json_add_numeric_metric.3stap)  
for details.

[**json\_add\_string\_metric**](#json_add_string_metric)

Add a string metric

See [*function::json\_add\_string\_metric*(3stap)](/man/enterprise-packages/systemtap/function::json_add_string_metric.3stap)  
for details.

[**json\_add\_array**](#json_add_array)

Add an array

See [*function::json\_add\_array*(3stap)](/man/enterprise-packages/systemtap/function::json_add_array.3stap)  
for details.

[**json\_add\_array\_numeric\_metric**](#json_add_array_numeric_metric)

Add a numeric metric to an array

See [*function::json\_add\_array\_numeric\_metric*(3stap)](/man/enterprise-packages/systemtap/function::json_add_array_numeric_metric.3stap)  
for details.

[**json\_add\_array\_string\_metric**](#json_add_array_string_metric)

Add a string metric to an array

See [*function::json\_add\_array\_string\_metric*(3stap)](/man/enterprise-packages/systemtap/function::json_add_array_string_metric.3stap)  
for details.

[**json\_data**](#json_data)

Fires whenever JSON data is wanted by a reader.

See [*probe::json\_data*(3stap)](/man/enterprise-packages/systemtap/probe::json_data.3stap)  
for details.

**@json\_output\_data\_start**

Start the json output.

See [*macro::json\_output\_data\_start*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_data_start.3stap)  
for details.

**@json\_output\_string\_value**

Output a string value.

See [*macro::json\_output\_string\_value*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_string_value.3stap)  
for details.

**@json\_output\_numeric\_value**

Output a numeric value.

See [*macro::json\_output\_numeric\_value*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_numeric_value.3stap)  
for details.

**@json\_output\_array\_string\_value**

Output a string value for metric in an array.

See [*macro::json\_output\_array\_string\_value*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_array_string_value.3stap)  
for details.

**@json\_output\_array\_numeric\_value**

Output a numeric value for metric in an array.

See [*macro::json\_output\_array\_numeric\_value*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_array_numeric_value.3stap)  
for details.

**@json\_output\_data\_end**

End the json output.

See [*macro::json\_output\_data\_end*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_data_end.3stap)  
for details.

# [SEE ALSO](#SEE_ALSO)

[*function::json\_set\_prefix*(3stap)](/man/enterprise-packages/systemtap/function::json_set_prefix.3stap), [*function::json\_add\_numeric\_metric*(3stap)](/man/enterprise-packages/systemtap/function::json_add_numeric_metric.3stap), [*function::json\_add\_string\_metric*(3stap)](/man/enterprise-packages/systemtap/function::json_add_string_metric.3stap), [*function::json\_add\_array*(3stap)](/man/enterprise-packages/systemtap/function::json_add_array.3stap), [*function::json\_add\_array\_numeric\_metric*(3stap)](/man/enterprise-packages/systemtap/function::json_add_array_numeric_metric.3stap), [*function::json\_add\_array\_string\_metric*(3stap)](/man/enterprise-packages/systemtap/function::json_add_array_string_metric.3stap), [*probe::json\_data*(3stap)](/man/enterprise-packages/systemtap/probe::json_data.3stap), [*macro::json\_output\_data\_start*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_data_start.3stap), [*macro::json\_output\_string\_value*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_string_value.3stap), [*macro::json\_output\_numeric\_value*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_numeric_value.3stap), [*macro::json\_output\_array\_string\_value*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_array_string_value.3stap), [*macro::json\_output\_array\_numeric\_value*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_array_numeric_value.3stap), [*macro::json\_output\_data\_end*(3stap)](/man/enterprise-packages/systemtap/macro::json_output_data_end.3stap), [*stap*(1)](/man/enterprise-packages/systemtap/stap.1), [*stapprobes*(3stap)](/man/enterprise-packages/systemtap/stapprobes.3stap)

September 2026 SystemTap Tapset Reference

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Document: tapset::json(3stap) from systemtap 5.6-r0 (Chainguard OS)
Source: https://sourceware.org/git/systemtap.git