array inside another array

Question

Problem Statement

I'm trying to create an array with another array inside this array, but it doesn't work for me.

This is what i wrote:

var arr = '{"project":['
 + '{"id":"01","name":"project1","activity":['
 + '{"num":"001","time":"7","desc":"desc","stam":['
 + ' "pre":"005","pre2":"002"]}'
 + '{"num":"002","time":"6","desc":"desc"}'
 + '{"num":"003","time":"5","desc":"desc"}'
 + '{"num":"004","time":"4","desc":"desc"}'
 + '{"num":"005","time":"3","desc":"desc"}]}]}';

• Kumar Saurabh: this may be useful, i am new to js so not sure if its of any help stackoverflow.com/questions/9871634/…
• Quentin: Don't try to build JSON by smashing strings together. It is simply too painful to debug. Use real arrays and real objects and once you are done, use JSON.stringify.
• Quentin: That said, your trivial typo is revealed if you take the resulting string and paste it into jsonlint.com (voting to close because the problem was caused by a simple typographical error).

Answer 1

Your JSON looks corrupted. You can use several online editors and validators to verify the JSON string. editor and validator just as an example of mony others. You also might have a look here.

• , is missing between the array elements
• the property stam looks more like an object than an array

It should look like this:

{"project":[
 {"id":"01","name":"project1","activity":
 [
 {"num":"001","time":"7","desc":"desc","stam":{
 "pre":"005",
 "pre2":"002"
 }
 },
 {"num":"002","time":"6","desc":"desc"},
 {"num":"003","time":"5","desc":"desc"},
 {"num":"004","time":"4","desc":"desc"},
 {"num":"005","time":"3","desc":"desc"}
 ]
 }
 ]
}

Answer 2

The json is not formatted correctly:

{
 project : [{
 id : "01",
 name: "project1", 
 activity :[
 { 
 num : "001",
 time : "7",
 desc : "desc",
 stam : [{
 pre : "005", 
 pre2: "002"
 }]
 },
 {
 num : "002", 
 time: "6",
 desc: "desc"
 },
 {
 num : "003",
 time: "5",
 desc:"desc"
 },
 {
 num : "004",
 time: "4",
 desc: "desc"
 },
 {
 num : "005",
 time: "3",
 desc: "desc"
 }
 ]
 }]
}