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- Permission Management
- Log Collection
- Collection Overview
- Collecting Logs in Self-Built Kubernetes Cluster
- Collecting Syslog
- Collection by LogListener
- Collecting Text Log
- Uploading Log over Kafka
- Uploading Logs via Anonymous Write
- Uploading Logs via Logback Appender
- Uploading Logs via Log4j Appender
- Uploading Log via SDK
- Uploading Log via API
- Importing Data
- Tencent Cloud Service Log Access
- Metric Collection
- Log Storage
- Metric Storage
- Search and Analysis (Log Topic)
- Overview of Search and Analysis
- Syntax and Rules
- Statistical Analysis (SQL)
- Quick Analysis
- SQL Syntax
- SQL Functions
- String Function
- Date and Time Functions
- IP Geographic Function
- URL Function
- Mathematical Calculation Functions
- Mathematical Statistical Function
- General Aggregate Function
- Geospatial Function
- Binary String Function
- Estimation Function
- Type Conversion Function
- Logical Function
- Operators
- Bitwise Operation
- Regular Expression Function
- Lambda Function
- Conditional Expressions
- Array Functions
- Interval-Valued Comparison and Periodicity-Valued Comparison Functions
- JSON Functions
- Window Functions
- Sampling Analysis
- Configuring Indexes
- Reindexing
- Multi-Topic Search
- Context Search and Analysis
- Custom Redirect
- Downloading Log
- Search and Analysis (Metric Topic)
- Dashboard
- Data Processing documents
- Data Processing
- Data Processing Overview
- Creating Processing Task
- Viewing Data Processing Details
- Data Processing Functions
- Function Overview
- Key-Value Extraction Functions
- Enrichment Functions
- Flow Control
- Row Processing Functions
- Field Processing Functions
- Value Structuring Functions
- Regular Expression Processing Functions
- Time Value Processing Functions
- String Processing Functions
- Type Conversion Functions
- Logical and Mathematical Functions
- Encoding and Decoding Functions
- IP Parsing Functions
- Processing Cases
- Scheduled SQL Analysis
- SCF
- Data Processing
- Shipping and Consumption
- Monitoring Alarm
- Historical Documentation
- Practical Tutorial
- Developer Guide
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Topic Management APIs
- Log Set Management APIs
- Index APIs
- Topic Partition APIs
- Machine Group APIs
- Collection Configuration APIs
- Log APIs
- Metric APIs
- Alarm Policy APIs
- Data Processing APIs
- Kafka Protocol Consumption APIs
- CKafka Shipping Task APIs
- Kafka Data Subscription APIs
- COS Shipping Task APIs
- SCF Delivery Task APIs
- Scheduled SQL Analysis APIs
- COS Data Import Task APIs
- Data Types
- Error Codes
- FAQs
- CLS Service Level Agreement
- CLS Policy
- Contact Us
- Glossary
Overview
Value structuring functions can be used to extract values of specified JSON nodes, convert XML data to JSON data and vice versa, and determine whether a value is a JSON string.
Function json_select
Function definition
This function is used to extract a JSON field value with a JMES expression and return the JSON string of the extraction result.
Syntax description
json_select(v(Field name), jmes="")
Parameter description
Parameter | Description | Parameter Type | Required | Default Value | Value Range |
data | Field value, which can be extracted by other functions | string | Yes | - | - |
jmes | JMES expression | string | Yes | - | - |
Example
Raw log:
{"field": "{\\"a\\":{\\"b\\":{\\"c\\":{\\"d\\":\\"success\\"}}}}", "status": "500"}
Processing rule:
fields_set("message", json_select(v("field"), jmes="a.b.c.d"))
Processing result:
{"field":"{\\"a\\":{\\"b\\":{\\"c\\":{\\"d\\":\\"success\\"}}}}","message":"success","status":"500"}
Function xml_to_json
Function definition
This function is used to parse and convert an XML-formatted value to a JSON string. The input value must be an XML string. Otherwise, a conversion exception will occur.
Syntax description
xml_to_json(Field value)
Parameter description
Parameter | Description | Parameter Type | Required | Default Value | Value Range |
data | Field value | string | Yes | - | - |
Example
Raw log:
{"xml_field": "<note><to>B</to><from>A</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></note>", "status": "500"}
Processing rule:
fields_set("json_field", xml_to_json(v("xml_field")))
Processing result:
{"xml_field":"<note><to>B</to><from>A</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></note>","json_field":"{\\"to\\":\\"B\\",\\"from\\":\\"A\\",\\"heading\\":\\"Reminder\\",\\"body\\":\\"Don't forget me this weekend!\\"}","status":"500"}
Function json_to_xml
Function definition
This function is used to parse and convert a JSON string value to an XML string.
Syntax description
json_to_xml(Field value)
Parameter description
Parameter | Description | Parameter Type | Required | Default Value | Value Range |
data | Field value | string | Yes | - | - |
Example
Raw log:
{"json_field":"{\\"to\\":\\"B\\",\\"from\\":\\"A\\",\\"heading\\":\\"Reminder\\",\\"body\\":\\"Don't forget me this weekend!\\"}", "status": "200"}
Processing rule:
fields_set("xml_field", json_to_xml(v("json_field")))
Processing result:
{"json_field":"{\\"to\\":\\"B\\",\\"from\\":\\"A\\",\\"heading\\":\\"Reminder\\",\\"body\\":\\"Don't forget me this weekend!\\"}","xml_field":"<ObjectNode><to>B</to><from>A</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></ObjectNode>","status":"200"}
Function if_json
Function definition
This function is used to determine whether a value is a JSON string.
Syntax description
if_json(Field value)
Parameter description
Parameter | Description | Parameter Type | Required | Default Value | Value Range |
data | Field value | string | Yes | - | - |
Example
Example 1
Raw log:
{"condition":"{\\"a\\":\\"b\\"}","status":"500"}
Processing statement:
t_if(if_json(v("condition")), fields_set("new", 1))
Processing result:
{"new":"1","condition":"{\\"a\\":\\"b\\"}","status":"500"}
Example 2
Raw log:
{"condition":"haha","status":"500"}
Processing statement:
t_if(if_json(v("condition")), fields_set("new", 1))
Processing result:
{"condition":"haha","status":"500"}
Yes
No
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