JSON.DEBUG FIELDS
Introduction and Use Case(s)
JSON.DEBUG FIELDS
is a command in Redis designed to provide debugging information about the structure of JSON documents stored in Redis. It gives insights into the fields present within a JSON document, which can be particularly useful during development or troubleshooting.
Typical scenarios include:
- Understanding the structure of complex JSON documents.
- Debugging issues related to missing or unexpected fields in JSON objects.
- Verifying the integrity and completeness of JSON data stored in Redis.
Syntax
JSON.DEBUG FIELDS key
Parameter Explanations
key
: The key associated with the JSON document for which you want to retrieve field information. It must be a valid string corresponding to an existing key in the database.
Return Values
The command returns an array of strings, each representing a field name within the specified JSON document.
Example outputs:
If the JSON document has fields “name”, “age”, and “address”, the output might be:
1) "name"
2) "age"
3) "address"
For an empty or non-existent JSON document, it will return an empty array.
Code Examples
dragonfly> JSON.SET myjson . '{"name":"John", "age":30, "city":"New York"}'
OK
dragonfly> JSON.DEBUG FIELDS myjson
1) "name"
2) "age"
3) "city"
dragonfly> JSON.SET anotherjson . '{"product":"Book", "price":15}'
OK
dragonfly> JSON.DEBUG FIELDS anotherjson
1) "product"
2) "price"
dragonfly> JSON.SET emptyjson . '{}'
OK
dragonfly> JSON.DEBUG FIELDS emptyjson
(empty array)
Best Practices
- Use
JSON.DEBUG FIELDS
during development to verify that your JSON documents contain all expected fields before proceeding with application logic. - Combine
JSON.DEBUG FIELDS
with other JSON commands likeJSON.GET
to dynamically adjust your application behavior based on the existence of certain fields.
Common Mistakes
- Attempting to use
JSON.DEBUG FIELDS
on keys that do not store JSON documents will result in an error. Ensure that the key indeed contains a JSON value before using this command.
FAQs
What happens if I use JSON.DEBUG FIELDS
on a non-JSON key?
Using JSON.DEBUG FIELDS
on a key that does not store a JSON document will result in a type error. Always ensure the key refers to a JSON structure.
Can JSON.DEBUG FIELDS
handle deeply nested JSON structures?
JSON.DEBUG FIELDS
only provides the top-level fields of the JSON document. For deeper insights, you will need to access nested objects individually.