toJson
Syntax
toJson(X)
Arguments
X can be any data type.
Details
Convert a DolphinDB object to JSON format. The result includes 5 key-value pairs: name, form, type, size and value.
For different data forms, the maximum length of the data to be converted differs:
Data Forms | Max Length |
---|---|
matrix | 300000 |
set | 300000 |
vector | 300000 |
dict | 300000 |
table | 100000 |
Examples
x=1 2 3
y=toJson(x)
y;
// output
{"name":"x","form":"vector","type":"int","size":"3","value":[1,2,3]}
t=table(1 2 3 as id, 10 20 30 as val)
toJson(t);
// output
{"name":"t","form":"table","size":"3","value":[{"name":"id","form":"vector","type":"int","size":"3","value":[1,2,3]},{"name":"val","form":"vector","type":"int","size":"3","value":[10,20,30]}]}
// The length of set exceeds 30000, and toJson can only convert the first 30000 elements
x=set(1..400001)
y=toJson(x)
size(fromJson(y))
// output
300000
Related function: fromJson