Backus-Naur Form JSON Parser based on RegEx for VBA.
- Converts JSON string to a structure of nested Dictionaries and Arrays. JSON Objects
{}are represented by Dictionaries, providing.Count,.Exists(),.Item(),.Items,.Keysproperties and methods. JSON Arrays[]are the conventional zero-based VB Arrays, soUBound()allows to get the number of elements. Such approach makes easy and straightforward access to structure elements. - Serialize and beautify JSON structure.
- Builds 2D Array based on table-like JSON structure.
- Flattens JSON structure.
- Serialize JSON structure into YAML format string.
- Parser complies with JSON Standard.
- Allows few non-stantard features in JSON string parsing: single quoted and unquoted object keys, single quoted strings, capitalised
True,FalseandNullconstants, and trailing commas. - Invulnerable for malicious JS code injections.
Supported by MS Windows Office 2003+ (Excel, Word, Access, PowerPoint, Publisher, Visio etc.), CorelDraw, AutoCAD and many others applications with hosted VBA. And even VB6.
Import JSON.bas module into the VBA Project for JSON processing. No references are necessary in the VBA Project due to late bind.
How to import?
Download and save JSON.bas to a file - open the page with JSON.bas code, right-click on Raw button, choose Save link as... (for Chrome):
Import JSON.bas into the VBA Project - open Visual Basic Editor by pressing Alt+F11, right-click on Project Tree, choose Import File, select saved JSON.bas:
Here is simple example for MS Excel, put the below code into standard module:
Option Explicit Sub Test() Dim sJSONString As String Dim vJSON Dim sState As String Dim vFlat ' Retrieve JSON response With CreateObject("MSXML2.XMLHTTP") .Open "GET", "http://trirand.com/blog/phpjqgrid/examples/jsonp/getjsonp.php?qwery=longorders&rows=1000", True .Send Do Until .ReadyState = 4: DoEvents: Loop sJSONString = .ResponseText End With ' Parse JSON response JSON.Parse sJSONString, vJSON, sState ' Check response validity Select Case True Case sState <> "Object" MsgBox "Invalid JSON response" Case Not vJSON.Exists("rows") MsgBox "JSON contains no rows" Case Else ' Convert JSON nested rows array to 2D Array and output to worksheet #1 Output ThisWorkbook.Sheets(1), vJSON("rows") ' Flatten JSON JSON.Flatten vJSON, vFlat ' Convert to 2D Array and output to worksheet #2 Output ThisWorkbook.Sheets(2), vFlat ' Serialize JSON and save to file CreateObject("Scripting.FileSystemObject") _ .OpenTextFile(ThisWorkbook.Path & "\sample.json", 2, True, -1) _ .Write JSON.Serialize(vJSON) ' Convert JSON to YAML and save to file CreateObject("Scripting.FileSystemObject") _ .OpenTextFile(ThisWorkbook.Path & "\sample.yaml", 2, True, -1) _ .Write JSON.ToYaml(vJSON) MsgBox "Completed" End Select End Sub Sub Output(oTarget As Worksheet, vJSON) Dim aData() Dim aHeader() ' Convert JSON to 2D Array JSON.ToArray vJSON, aData, aHeader ' Output to target worksheet range With oTarget .Activate .Cells.Delete With .Cells(1, 1) .Resize(1, UBound(aHeader) - LBound(aHeader) + 1).Value = aHeader .Offset(1, 0).Resize( _ UBound(aData, 1) - LBound(aData, 1) + 1, _ UBound(aData, 2) - LBound(aData, 2) + 1 _ ).Value = aData End With .Columns.AutoFit End With End Sub You can find some usage examples on SO.