Parse JSON in TSQL

Is it possible to parse JSON in TSQL?
I dont mean to create a JSON string, i mean to parse a json string passed in as a parameter.

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  • 8 Solutions collect form web for “Parse JSON in TSQL”

    Update: As of SQL Server 2016 parsing JSON in TSQL is now possible.

    Natively, there is no support. You’ll have to use CLR. It is as simple as that, unless you have a huge masochistic streak and want to write a JSON parser in SQL

    Normally, folk ask for JSON output from the DB and there are examples on the internet. But into a DB?

    I seem to have a huge masochistic streak in that I’ve written a JSON parser. It converts a JSON document into a SQL Adjacency list table, which is easy to use to update your data tables. Actually, I’ve done worse, in that I’ve done code to do the reverse process, which is to go from a hierarchy table to a JSON string

    The article and code is here: Consuming Json strings in SQL server.

    Select * from parseJSON('{
         "firstName": "John",
         "lastName": "Smith",
         "age": 25,
            "streetAddress":"21 2nd Street",
            "city":"New York",
            "home":"212 555-1234",
            "fax":"646 555-4567"

    To get:

    enter image description here

    Finally SQL Server 2016 will add Native JSON support!!


    Additional capabilities in SQL Server 2016 include:

    • Additional security enhancements for Row-level Security and Dynamic Data Masking to round out our security investments with Always
    • Improvements to AlwaysOn for more robust availability and disaster recovery with multiple synchronous replicas and secondary load
    • Native JSON support to offer better performance and support for your many types of your data.
    • SQL Server Enterprise Information Management (EIM) tools and Analysis Services get an upgrade in performance, usability and
    • Faster hybrid backups, high availability and disaster recovery scenarios to backup and restore your on-premises databases to Azure
      and place your SQL Server AlwaysOn secondaries in Azure.


    Features blog post:

    I do also have a huge masochistic streak as that I’ve written yet another JSON parser. This one uses a procedural approach. It uses a similat SQL hierarchy list table to store the parsed data. Also in the package are:

    • Reverse process: from hierarchy to JSON
    • Querying functions: to fetch particular values from a JSON object

    Please feel free to use and have fun with it

    RETURNS @hierarchy TABLE
       element_id INT IDENTITY(1, 1) NOT NULL, /* internal surrogate primary key gives the order of parsing and the list order */
       sequenceNo [int] NULL, /* the place in the sequence for the element */
       parent_ID INT,/* if the element has a parent then it is in this column. The document is the ultimate parent, so you can get the structure from recursing from the document */
       Object_ID INT,/* each list or object has an object id. This ties all elements to a parent. Lists are treated as objects here */
       NAME NVARCHAR(2000),/* the name of the object */
       StringValue NVARCHAR(MAX) NOT NULL,/*the string representation of the value of the element. */
       ValueType VARCHAR(10) NOT null /* the declared type of the value represented as a string in StringValue*/
        @FirstObject INT, --the index of the first open bracket found in the JSON string
        @OpenDelimiter INT,--the index of the next open bracket found in the JSON string
        @NextOpenDelimiter INT,--the index of subsequent open bracket found in the JSON string
        @NextCloseDelimiter INT,--the index of subsequent close bracket found in the JSON string
        @Type NVARCHAR(10),--whether it denotes an object or an array
        @NextCloseDelimiterChar CHAR(1),--either a '}' or a ']'
        @Contents NVARCHAR(MAX), --the unparsed contents of the bracketed expression
        @Start INT, --index of the start of the token that you are parsing
        @end INT,--index of the end of the token that you are parsing
        @param INT,--the parameter at the end of the next Object/Array token
        @EndOfName INT,--the index of the start of the parameter at end of Object/Array token
        @token NVARCHAR(200),--either a string or object
        @value NVARCHAR(MAX), -- the value as a string
        @SequenceNo int, -- the sequence number within a list
        @name NVARCHAR(200), --the name as a string
        @parent_ID INT,--the next parent ID to allocate
        @lenJSON INT,--the current length of the JSON String
        @characters NCHAR(36),--used to convert hex to decimal
        @result BIGINT,--the value of the hex symbol being parsed
        @index SMALLINT,--used for parsing the hex value
        @Escape INT --the index of the next escape character
      DECLARE @Strings TABLE /* in this temporary table we keep all strings, even the names of the elements, since they are 'escaped' in a different way, and may contain, unescaped, brackets denoting objects or lists. These are replaced in the JSON string by tokens representing the string */
         String_ID INT IDENTITY(1, 1),
         StringValue NVARCHAR(MAX)
      SELECT--initialise the characters to convert hex to ascii
        @SequenceNo=0, --set the sequence no. to something sensible.
      /* firstly we process all strings. This is done because [{} and ] aren't escaped in strings, which complicates an iterative parse. */
      WHILE 1=1 --forever until there is nothing more to do
            @start=PATINDEX('%[^a-zA-Z]["]%', @json collate SQL_Latin1_General_CP850_Bin);--next delimited string
          IF @start=0 BREAK --no more so drop through the WHILE loop
          IF SUBSTRING(@json, @start+1, 1)='"'
            BEGIN --Delimited Name
              SET @start=@Start+1;
              SET @end=PATINDEX('%[^\]["]%', RIGHT(@json, LEN(@json+'|')-@start) collate SQL_Latin1_General_CP850_Bin);
          IF @end=0 --no end delimiter to last string
            BREAK --no more
          SELECT @token=SUBSTRING(@json, @start+1, @end-1)
          --now put in the escaped control characters
          SELECT @token=REPLACE(@token, FROMString, TOString)
              '\"' AS FromString, '"' AS ToString
             UNION ALL SELECT '\\', '\'
             UNION ALL SELECT '\/', '/'
             UNION ALL SELECT '\b', CHAR(08)
             UNION ALL SELECT '\f', CHAR(12)
             UNION ALL SELECT '\n', CHAR(10)
             UNION ALL SELECT '\r', CHAR(13)
             UNION ALL SELECT '\t', CHAR(09)
            ) substitutions
          SELECT @result=0, @escape=1
      --Begin to take out any hex escape codes
          WHILE @escape>0
              SELECT @index=0,
              --find the next hex escape sequence
              @escape=PATINDEX('%\x[0-9a-f][0-9a-f][0-9a-f][0-9a-f]%', @token collate SQL_Latin1_General_CP850_Bin)
              IF @escape>0 --if there is one
                  WHILE @index<4 --there are always four digits to a \x sequence  
                      SELECT --determine its value
                        @result=@result+POWER(16, @index)
                        *(CHARINDEX(SUBSTRING(@token, @escape+2+3-@index, 1),
                                    @characters)-1), @index=@index+1 ;
                    -- and replace the hex sequence by its unicode value
                  SELECT @token=STUFF(@token, @escape, 6, NCHAR(@result))
          --now store the string away
          INSERT INTO @Strings (StringValue) SELECT @token
          -- and replace the string with a token
          SELECT @JSON=STUFF(@json, @start, @end+1,
                        '@string'+CONVERT(NVARCHAR(5), @@identity))
      -- all strings are now removed. Now we find the first leaf. 
      WHILE 1=1  --forever until there is nothing more to do
      SELECT @parent_ID=@parent_ID+1
      --find the first object or list by looking for the open bracket
      SELECT @FirstObject=PATINDEX('%[{[[]%', @json collate SQL_Latin1_General_CP850_Bin)--object or array
      IF @FirstObject = 0 BREAK
      IF (SUBSTRING(@json, @FirstObject, 1)='{')
        SELECT @NextCloseDelimiterChar='}', @type='object'
        SELECT @NextCloseDelimiterChar=']', @type='array'
      SELECT @OpenDelimiter=@firstObject
      WHILE 1=1 --find the innermost object or list...
      --find the matching close-delimiter proceeding after the open-delimiter
            @NextCloseDelimiter=CHARINDEX(@NextCloseDelimiterChar, @json,
      --is there an intervening open-delimiter of either type
          SELECT @NextOpenDelimiter=PATINDEX('%[{[[]%',
                 RIGHT(@json, @lenJSON-@OpenDelimiter)collate SQL_Latin1_General_CP850_Bin)--object
          IF @NextOpenDelimiter=0
          SELECT @NextOpenDelimiter=@NextOpenDelimiter+@OpenDelimiter
          IF @NextCloseDelimiter<@NextOpenDelimiter
          IF SUBSTRING(@json, @NextOpenDelimiter, 1)='{'
            SELECT @NextCloseDelimiterChar='}', @type='object'
            SELECT @NextCloseDelimiterChar=']', @type='array'
          SELECT @OpenDelimiter=@NextOpenDelimiter
      ---and parse out the list or name/value pairs
        @contents=SUBSTRING(@json, @OpenDelimiter+1,
        @JSON=STUFF(@json, @OpenDelimiter,
                    '@'+@type+CONVERT(NVARCHAR(5), @parent_ID))
      WHILE (PATINDEX('%[A-Za-z0-9@+.e]%', @contents collate SQL_Latin1_General_CP850_Bin))<>0
          IF @Type='Object' --it will be a 0-n list containing a string followed by a string, number,boolean, or null
                @SequenceNo=0,@end=CHARINDEX(':', ' '+@contents)--if there is anything, it will be a string-based name.
              SELECT  @start=PATINDEX('%[^A-Za-z@][@]%', ' '+@contents collate SQL_Latin1_General_CP850_Bin)--AAAAAAAA
              SELECT @token=SUBSTRING(' '+@contents, @start+1, @End-@Start-1),
                @endofname=PATINDEX('%[0-9]%', @token collate SQL_Latin1_General_CP850_Bin),
                @param=RIGHT(@token, LEN(@token)-@endofname+1)
                @token=LEFT(@token, @endofname-1),
                @Contents=RIGHT(' '+@contents, LEN(' '+@contents+'|')-@end-1)
              SELECT  @name=stringvalue FROM @strings
                WHERE string_id=@param --fetch the name
            SELECT @Name=null,@SequenceNo=@SequenceNo+1
            @end=CHARINDEX(',', @contents)-- a string-token, object-token, list-token, number,boolean, or null
          IF @end=0
            SELECT  @end=PATINDEX('%[A-Za-z0-9@+.e][^A-Za-z0-9@+.e]%', @Contents+' ' collate SQL_Latin1_General_CP850_Bin)
            @start=PATINDEX('%[^A-Za-z0-9@+.e][A-Za-z0-9@+.e]%', ' '+@contents collate SQL_Latin1_General_CP850_Bin)
          --select @start,@end, LEN(@contents+'|'), @contents 
            @Value=RTRIM(SUBSTRING(@contents, @start, @End-@Start)),
            @Contents=RIGHT(@contents+' ', LEN(@contents+'|')-@end)
          IF SUBSTRING(@value, 1, 7)='@object'
            INSERT INTO @hierarchy
              (NAME, SequenceNo, parent_ID, StringValue, Object_ID, ValueType)
              SELECT @name, @SequenceNo, @parent_ID, SUBSTRING(@value, 8, 5),
                SUBSTRING(@value, 8, 5), 'object'
            IF SUBSTRING(@value, 1, 6)='@array'
              INSERT INTO @hierarchy
                (NAME, SequenceNo, parent_ID, StringValue, Object_ID, ValueType)
                SELECT @name, @SequenceNo, @parent_ID, SUBSTRING(@value, 7, 5),
                  SUBSTRING(@value, 7, 5), 'array'
              IF SUBSTRING(@value, 1, 7)='@string'
                INSERT INTO @hierarchy
                  (NAME, SequenceNo, parent_ID, StringValue, ValueType)
                  SELECT @name, @SequenceNo, @parent_ID, stringvalue, 'string'
                  FROM @strings
                  WHERE string_id=SUBSTRING(@value, 8, 5)
                IF @value IN ('true', 'false')
                  INSERT INTO @hierarchy
                    (NAME, SequenceNo, parent_ID, StringValue, ValueType)
                    SELECT @name, @SequenceNo, @parent_ID, @value, 'boolean'
                  IF @value='null'
                    INSERT INTO @hierarchy
                      (NAME, SequenceNo, parent_ID, StringValue, ValueType)
                      SELECT @name, @SequenceNo, @parent_ID, @value, 'null'
                    IF PATINDEX('%[^0-9]%', @value collate SQL_Latin1_General_CP850_Bin)>0
                      INSERT INTO @hierarchy
                        (NAME, SequenceNo, parent_ID, StringValue, ValueType)
                        SELECT @name, @SequenceNo, @parent_ID, @value, 'real'
                      INSERT INTO @hierarchy
                        (NAME, SequenceNo, parent_ID, StringValue, ValueType)
                        SELECT @name, @SequenceNo, @parent_ID, @value, 'int'
          if @Contents=' ' Select @SequenceNo=0
    INSERT INTO @hierarchy (NAME, SequenceNo, parent_ID, StringValue, Object_ID, ValueType)
      SELECT '-',1, NULL, '', @parent_id-1, @type

    —Pase JSON

    Declare @pars varchar(MAX) = 
    ' {"shapes":[{"type":"polygon","geofenceName":"","geofenceDescription":"",
    Select * from parseJSON(@pars) AS MyResult 

    Now there is a Native support in SQL Server (CTP3) for import, export, query and validate JSON inside T-SQL
    Refer to

    SQL server 2016 supports json data parsing using OPENJSON. You can use OPENJSON to map json data to rows and columns.

    Your json Data

     { "id" : 2,"name": "John"},
     { "id" : 5,"name": "John"}

    Here is how you can handle json in sql

    //@pJson is json data passed from code.  
    INSERT INTO YourTable (id, Name)
     SELECT id, name
     FROM OPENJSON(@pJson)
     WITH (id int,
           name nvarchar(max))

    Here is a detailed article which covers this topic.

    I have seen a pretty neat article about this… so if you like this:

    CREATE PROC [dbo].[spUpdateMarks]
        @inputJSON VARCHAR(MAX)  -- '[{"ID":"1","C":"60","CPP":"60","CS":"60"}]'
        -- Temp table to hold the parsed data
        DECLARE @TempTableVariable TABLE(
            element_id INT,
            sequenceNo INT,
            parent_ID INT,
            [Object_ID] INT,
            [NAME] NVARCHAR(2000),
            StringValue NVARCHAR(MAX),
            ValueType NVARCHAR(10)
        -- Parse JSON string into a temp table
        INSERT INTO @TempTableVariable
        SELECT * FROM parseJSON(@inputJSON)

    Try to look here:

    There is a complete ASP.Net project about this here:

    MS SQL Server is a Microsoft SQL Database product, include sql server standard, sql server management studio, sql server express and so on.