This guide covers functions available for querying array fields in SigNoz.
Functions are currently supported only for JSON body searches.
Available Functions
hasToken() Function
Check if a token is present in a string.
The search term must be a single token—meaning a sequence of alphanumeric characters (A-Z, a-z, 0-9) that appears in the text separated by spaces, punctuation, or at the start/end of the string. hasToken will only match the term as a whole word, not as a substring inside another word (e.g., matches uuid123 but not abcuuid123xyz)
Syntax:
has(field, value)
Examples:
has(body, "john@test.com")
has(body, "e8ff7fe2-6f6a-4795-bd7f-d07f8e49d764")
has() Function
Checks if an array contains a specific value.
Syntax:
has(field, value)
Examples:
has(body.user_ids, 123)
has(body.tags, 'production')
has(body.regions, 'us-east')
Important Notes
- Body fields only - Functions currently work only with JSON body fields (fields prefixed with
body.) except for the hasToken function. - Array data - The field must contain an array for these functions to work properly
Combining with Other Conditions
Functions can be combined with other query conditions:
# Find production logs with error status codes
has(body.tags, 'production') AND status_code IN [500, 502, 503]
Common Use Cases
Filtering by Tags
# Find all logs with production tag
has(body.tags, 'production')
## Error Messages
Common errors you might encounter:
- **"unknown function"** - Check function name spelling and case
- **"function expects key and value parameters"** - Ensure you're providing both field and value
- **"function supports only body JSON search"** - Use only with `body.` prefixed fields