How to calculate the number of nodes in a JSON string

how to get key and value from json array object in javascript
get value from json object in javascript
json beautifier
json format
json viewer
json example
find the depth of json object javascript
json.parse array of objects

Is there a way to calculate the number of nodes in a JSON in SQL.

{   
 "File":[  
  {  
     "ID":1,
     "Fragment":"Frag1"
  },
  {  
     "ID":2,
     "Fragment":"Frag2"
  },
  {  
     "ID":3,
     "Fragment":"Frag3"
  }]
}

Is there a way to count the number of child elements under File node?

Answer should be 3 according to the above example.

Assuming SQL Server version 2016 or higher, You can use OPENJSON and select count(*):

DECLARE @Content varchar(500) = '{   
 "File":[  
  {  
     "ID":1,
     "Fragment":"Frag1"
  },
  {  
     "ID":2,
     "Fragment":"Frag2"
  },
  {  
     "ID":3,
     "Fragment":"Frag3"
  }]
}';

SELECT COUNT(*)
FROM OPENJSON(@Content, N'$.File')

Result: 3

See a live demo on DB<>Fiddle

Emerging Technologies and Applications in Data Processing and , Figure 6. JSON Trees Data Model • Nodes: in the model of JSON Trees. a node represents the data type One is an atomic type, such as string, integer and etc. The JSON value string length specifies the maximum number of bytes in a string value, and the JSON number length specifies the maximum number of bytes in a number value. For example, if the JSON maximum value string length is 2,097,152 bytes (2 MB), set the XML maximum node size to a value of at least 4,194,304 bytes (4 MB).

SELECT count(MyObjectList.ID)
    FROM Mytable
    CROSS APPLY OPENJSON (JsonDataCol, N'$.File')
      WITH (
        ID int)
          AS MyObjectList

[Solved] Finding level of any node/parameter object in given json , So, it can be safely used only in some cases; JSON is one of them. You can parse JSON string into such object graph which will be a valid  In the example, the first flow injects the JSON string '{"a":1}' which the JSON node converts to the equivalent JavaScript object. The second flow does the reverse, injecting the object { a: 1 } and converting it to JSON. The JSON will, by default, detect what it is being given to convert. It can also be configured to ensure the property is a

Here is another approach where Json string is inserted into the table. You can run this in lower Sql Server versions like SQL Server 2008 also where OPENJSON function is not available.

create table #temp (JsonDataCol varchar(max))
insert into #temp values (

'{   
 "File":[  
  {  
     "ID":1,
     "Fragment":"Frag1"
  },
  {  
     "ID":2,
     "Fragment":"Frag2"
  },
  {  
     "ID":3,
     "Fragment":"Frag3"
  }
}'

)

DECLARE @string Varchar(20) = '"ID"'
DECLARE @tosearch Varchar(Max)

set @tosearch = (SELECT JsonDataCol FROM #temp)

SELECT (LEN(@tosearch) - LEN(REPLACE(@tosearch, 'ID', '')))/2 as JsonLength

DROP TABLE #temp

Here divided by 2 because length of ID is 2 and it's one occurrence is 1 node. You can also run this query without table if you will assign @tosearch variable as shown below

DECLARE @tosearch Varchar(Max) = '{   
 "File":[  
  {  
     "ID":1,
     "Fragment":"Frag1"
  },
  {  
     "ID":2,
     "Fragment":"Frag2"
  },
  {  
     "ID":3,
     "Fragment":"Frag3"
  }
}'

The output is as shown below

JsonLength
3

You can find live demo on link SQL Demo - Json Length

Web Scraping with Python: Collecting Data from the Modern Web, a special JSON object or JSON node, Python uses a more flexible approach and turns in a JSON string: import json jsonString = '{"arrayOfNums":[{"number":0} If they are not logged in, their IP address is recorded, as shown in Figure 4-4. The two approaches using the JSON node and the JSON.parse() command are illustrated below: Is it JSON Data or a JavaScript Object? One of the most common problems that I’ve seen is trying to extract data from a JSON string thinking that it was a JavaScript object. In Node-red if you pass the data into the debug node then it will show you the

Learning Node, and the name string contains the following: 'johnsmith; drop table users' You could that the JSON is only JSON: var someObj = JSON.parse(jsonString); Since Node is I ended up finding data ranging from part identifiers to a reminder from one And it was extremely difficult to clean, because part numbers from different  How to parse JSON from a string, and how to read a JSON file in Node.js Published Aug 07, 2018 If you have JSON data as part of a string, the best way to parse it is by using the JSON.parse method that’s part of the JavaScript standard since ECMAScript 5, and it’s provided by V8 , the JavaScript engine that powers Node.js .

Beginning Node.js, Listing 4-16. json/convert/app.js var foo = { a: 1, b: 'a string', c: true }; // convert a JavaScript object to a console.log(json); console.log(typeof json); // string // convert a JSON string to a JavaScript A screenshot of NPM is shown in Figure 4-1. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more . Nodejs - parsing a string to JSON object. Ask Question Asked 1 year, 3 months ago. Active 1 year, 3 months ago. Viewed 726 times 0.

JSON Objects, JSON objects are written in key/value pairs. Keys must be strings, and values must be a valid JSON data type (string, number, object, array, boolean or null). Well the json node will do what you need. BUT the string you have isn’t quite what you need. However as the json node works both ways you can send in the object you want and see the string it produces.which is then the format of string you need to feed it.

Comments
  • While this answer might resolve the OP's question, it is suggested that you explain how it works and why it resolves the issue. This helps new developers understand what is going on and how to fix this and similar issues themselves. Thanks for contributing!