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98 lines
3.2 KiB
Markdown
98 lines
3.2 KiB
Markdown
---
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slug: /en/sql-reference/table-functions/fuzzJSON
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sidebar_position: 75
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sidebar_label: fuzzJSON
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---
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# fuzzJSON
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Perturbs a JSON string with random variations.
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``` sql
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fuzzJSON({ named_collection [, option=value [,..]] | json_str[, random_seed] })
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```
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**Arguments**
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- `named_collection`- A [NAMED COLLECTION](/docs/en/sql-reference/statements/create/named-collection.md).
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- `option=value` - Named collection optional parameters and their values.
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- `json_str` (String) - The source string representing structured data in JSON format.
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- `random_seed` (UInt64) - Manual random seed for producing stable results.
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- `reuse_output` (boolean) - Reuse the output from a fuzzing process as input for the next fuzzer.
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- `malform_output` (boolean) - Generate a string that cannot be parsed as a JSON object.
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- `max_output_length` (UInt64) - Maximum allowable length of the generated or perturbed JSON string.
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- `probability` (Float64) - The probability to fuzz a JSON field (a key-value pair). Must be within [0, 1] range.
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- `max_nesting_level` (UInt64) - The maximum allowed depth of nested structures within the JSON data.
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- `max_array_size` (UInt64) - The maximum allowed size of a JSON array.
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- `max_object_size` (UInt64) - The maximum allowed number of fields on a single level of a JSON object.
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- `max_string_value_length` (UInt64) - The maximum length of a String value.
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- `min_key_length` (UInt64) - The minimum key length. Should be at least 1.
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- `max_key_length` (UInt64) - The maximum key length. Should be greater or equal than the `min_key_length`, if specified.
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**Returned Value**
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A table object with a a single column containing perturbed JSON strings.
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## Usage Example
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``` sql
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CREATE NAMED COLLECTION json_fuzzer AS json_str='{}';
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SELECT * FROM fuzzJSON(json_fuzzer) LIMIT 3;
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```
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``` text
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{"52Xz2Zd4vKNcuP2":true}
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{"UPbOhOQAdPKIg91":3405264103600403024}
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{"X0QUWu8yT":[]}
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```
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``` sql
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SELECT * FROM fuzzJSON(json_fuzzer, json_str='{"name" : "value"}', random_seed=1234) LIMIT 3;
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```
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``` text
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{"key":"value", "mxPG0h1R5":"L-YQLv@9hcZbOIGrAn10%GA"}
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{"BRE3":true}
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{"key":"value", "SWzJdEJZ04nrpSfy":[{"3Q23y":[]}]}
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```
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``` sql
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SELECT * FROM fuzzJSON(json_fuzzer, json_str='{"students" : ["Alice", "Bob"]}', reuse_output=true) LIMIT 3;
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```
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``` text
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{"students":["Alice", "Bob"], "nwALnRMc4pyKD9Krv":[]}
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{"students":["1rNY5ZNs0wU&82t_P", "Bob"], "wLNRGzwDiMKdw":[{}]}
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{"xeEk":["1rNY5ZNs0wU&82t_P", "Bob"], "wLNRGzwDiMKdw":[{}, {}]}
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```
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``` sql
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SELECT * FROM fuzzJSON(json_fuzzer, json_str='{"students" : ["Alice", "Bob"]}', max_output_length=512) LIMIT 3;
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```
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``` text
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{"students":["Alice", "Bob"], "BREhhXj5":true}
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{"NyEsSWzJdeJZ04s":["Alice", 5737924650575683711, 5346334167565345826], "BjVO2X9L":true}
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{"NyEsSWzJdeJZ04s":["Alice", 5737924650575683711, 5346334167565345826], "BjVO2X9L":true, "k1SXzbSIz":[{}]}
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```
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``` sql
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SELECT * FROM fuzzJSON('{"id":1}', 1234) LIMIT 3;
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```
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``` text
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{"id":1, "mxPG0h1R5":"L-YQLv@9hcZbOIGrAn10%GA"}
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{"BRjE":16137826149911306846}
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{"XjKE":15076727133550123563}
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```
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``` sql
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SELECT * FROM fuzzJSON(json_nc, json_str='{"name" : "FuzzJSON"}', random_seed=1337, malform_output=true) LIMIT 3;
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```
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``` text
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U"name":"FuzzJSON*"SpByjZKtr2VAyHCO"falseh
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{"name"keFuzzJSON, "g6vVO7TCIk":jTt^
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{"DBhz":YFuzzJSON5}
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```
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