Description
Returns the input as a JSON string.
Syntax
ToJson(input[, try_parse])
Arguments
input - input field can be of the following data types: string, int, long, float, double, datetime, boolean, map or bag.
try_parse - true by default. Determines whether to try and parse the input string as JSON. If the string input can be parsed as JSON, use the parsed JSON in the output string. Otherwise, encode the string as a JSON string. If set to false, any string input would be returned as a JSON encoded string (see examples below).
Examples
With try_parse set to true (default value):
-
ToJson(null) returns 'null'
-
ToJson(1) returns '1'
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ToJson(CurrentTime()) returns '"2018-02-21T08:59:00.000Z"'
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ToJson(true) returns 'true'
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ToJson('true') returns 'true'
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ToJson('abc') returns '"abc"'
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ToJson('"a"') returns '"a"'
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ToJson('{"a":1}') returns '{"a":1}'
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ToJson('[1,2,3]') returns '[1,2,3]'
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ToJson('a"b"c') returns '"a\"b\"c"'
ToJson(TOMAP('a',1,'b','c')) -> '{"a":1,"b":"c"}'
ToJson(TOMAP('a','1','b','c')) -> '{"a":1,"b":"c"}'
- ToJson(TOMAP('a','{"c":1}','b','c')) -> '{"a":{"c":1},"b":"c"}'
- ToJson(TOMAP('a','{"c":1}','b',TOMAP('d',1))) -> '{"a":{"c":1},"b":{"d":1}}'
- ToJson(TOBAG(1,2,3)) returns '[1,2,3]'
- ToJson(TOBAG(TOTUPLE(1),TOTUPLE(2),TOTUPLE(3))) returns '[1,2,3]'
- ToJson(TOBAG('{"a":1}','{"a":2}')) returns '[{"a":1},{"a":2}]'
- ToJson(TOBAG(TOMAP('a',1),TOMAP('a',2))) returns '[{"a":1},{"a":2}]'
- ToJson(TOBAG(TOTUPLE(1,2,3),TOTUPLE(4,5,6))) will throw an exception as tuples are not supported.
With try_parse set to false:
-
ToJson(null,false) returns 'null'
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ToJson(1,false) returns '1'
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ToJson('1',false) returns '"1"'
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ToJson('true',false) returns '"true"'
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ToJson('abc',false) returns '"abc"'
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ToJson('"a"',false) returns '"\\"a\\""'
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ToJson('{"a":1}',false) returns '"{\\"a\\":1}"'
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ToJson('[1,2,3]',false) returns '"[1,2,3]"'
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ToJson('a"b"c', false) returns '"a\"b\"c"'
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ToJson(CurrentTime(),false) returns '"2018-02-21T08:59:00.000Z"'
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ToJson(true, false) returns 'true'
ToJson(TOMAP('a',1,'b','c'),false) -> '{"a":1,"b":"c"}'
ToJson(TOMAP('a','1','b','c'),false) -> '{"a":"1","b":"c"}'
- ToJson(TOMAP('a','{"c":1}','b','c'),false) -> '{"a":"{\\"c\\":1}","b":"c"}'
- ToJson(TOMAP('a','{"c":1}','b',TOMAP('d',1)),false) -> '{"a":"{\\"c\\":1}","b":{"d":1}}'
- ToJson(TOBAG(1,2,3),false) returns '[1,2,3]'
- ToJson(TOBAG(TOTUPLE(1),TOTUPLE(2),TOTUPLE(3)),false) returns '[1,2,3]'
- ToJson(TOBAG('{"a":1}','{"a":2}'),false) returns '["{\\"a\\":1}","{\\"a\\":2}"]'
- ToJson(TOBAG(TOMAP('a',1),TOMAP('a',2)),false) returns '[{"a":1},{"a":2}]'
- ToJson(TOBAG(TOTUPLE(1,2,3),TOTUPLE(4,5,6)),false) will throw an exception as tuples are not supported
Notes
Tuples with more than one field are not supported.
Return value datatype
String
Impact of null value
If input is null, returns 'null' as string.