JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式。易于人阅读和编写，同时也易于机器解析和生成。它基于JavaScript（Standard ECMA-262 3rd Edition - December 1999）的一个子集。 JSON采用完全独立于语言的文本格式，但是也使用了类似于C语言家族的习惯（包括C, C++, C#, Java, JavaScript, Perl, Python等）。这些特性使JSON成为理想的数据交换语言。

       Delphi7中不支持JSON文件的解析，可以下载LkJSON(一个JSON的解析文件)，然后进行解析。例如

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    memo1: TMemo;
    Memo2: TMemo;
    Button2: TButton;
    Button3: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
  Form1: TForm1;

implementation
uses uLkJSON,PerlRegEx;

{$R *.dfm}

procedure listarray(returnval: string; memo: Tmemo);
var
  json, item: TlkJSONbase;
  i: integer;
  list: TlkJSONObject;
  str: TlkJSONstring;
begin
  json := TlkJSON.ParseText(returnval);
for i := 0 to pred(json.Count) do
begin
    item := TlkJSONObject(json).child[i];
// This is the named array, name in name, the array in Objvalue
    Memo.Lines.Add(TlkJSONobjectmethod(item).name);
// list:=TlkJSONobject(TlkJSONobjectmethod(item).Objvalue);
end;
end;

procedure getlist(returnval: string; memo: Tmemo);
var
  Jstart: TlkJSONbase;
  jAddr: TlkJSONList;
  s: string;
begin
  Jstart := TlkJSON.ParseText(returnval) as TlkJSONobject;
//Jstart.field 为jbase时，
  s := vartostr(Jstart.Field['mac'].Field['lv'].Value);
  memo.Lines.add(s);
//Jstart.field 有子数据为jslist时
  s := vartostr(Jstart.Field['ranch'].Field['ranchs'].Child[1].field['hp'].Value);
  memo.Lines.add(s);
end;

procedure getlist1(returnval: string; memo: Tmemo);
var
  Jstart: TlkJSONbase;
  jAddr: TlkJSONList;
  s: string;
begin
  Jstart := TlkJSON.ParseText(returnval) as TlkJSONobject;
//Jstart.field 为jbase时，
  s := vartostr(Jstart.Field['list'].Field['key'].Value);
  memo.Lines.add(s);
//Jstart.field 有子数据为jslist时
  s := vartostr(Jstart.Field['list'].Field['script'].field['main'].Field['key'].Value);
  memo.Lines.add(s);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  vJsonObj: TlkJsonObject;
  vJsonStr: string;
begin
  memo1.Lines.Clear;
  Memo2.Lines.Clear;
  vJsonObj := TlkJSONstreamed.loadfromfile('d:\json2.txt') as TlkJsonObject;
  vJsonStr := TlkJSON.GenerateText(vJsonObj);
  memo1.Text := vjsonstr;
  listarray(memo1.Text, memo2);
  Memo2.Lines.Add('');
  getlist(memo1.Text, memo2);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  vJsonObj: TlkJsonObject;
  vJsonStr: string;
begin
  memo1.Lines.Clear;
  Memo2.Lines.Clear;
  vJsonObj := TlkJSONstreamed.loadfromfile('d:\json.txt') as TlkJsonObject;
  vJsonStr := TlkJSON.GenerateText(vJsonObj);
  memo1.Text := vjsonstr;
  listarray(memo1.Text, memo2);
  Memo2.Lines.Add('');
  getlist1(memo1.Text, memo2);
end;

end.

其中json.txt文件内容为：

{
 "ranch":
 {"lv":"10","fg":"433","fd":"440","j":"2","ranchs":
  [{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"0","stat":"0","item":"1014","fif":"0"},
   {"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"1","stat":"0","item":"1014","fif":"0"},
   {"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"2","stat":"0","item":"1014","fif":"0"},
   {"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"3","stat":"0","item":"1014","fif":"0"},
   {"tti":46800,"ti":5053,"we":"0","wo":"0","ar":"4","ph":1,"num":57,"or":57,"hp":"100","se":"3","pt":38,"st":0,"id":"4","stat":"0","item":"1014","fif":"1"},
   {"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"5","stat":"0","item":"1014","fif":"0"},
   {"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"6","stat":"0","item":"1014","fif":"0"},
   {"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"7","stat":"0","item":"1014","fif":"0"},
   {"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"8","stat":"0","item":"1014","fif":"0"},
   {"tti":46800,"ti":5048,"we":"0","wo":"0","ar":"4","ph":1,"num":57,"or":57,"hp":"99","se":"3","pt":38,"st":0,"id":"9","stat":"0","item":"1014","fif":"1"},
   {"tti":46800,"ti":5050,"we":"0","wo":"0","ar":"4","ph":1,"num":57,"or":57,"hp":"96","se":"3","pt":38,"st":0,"id":"10","stat":"0","item":"1014","fif":"1"},
   {"id":"11","stat":"0","item":"0","fif":"0"}]
 },
 "de":[],
 "pi":
 {"id":"1054966","uid":"26905522","n":"pan","lv":"26","exp":15886,"gg":"620564","db":"50","gold":0,"etn":21870,"sc":"156","gc":"195",
   "ac":
   {"sp":4370,"id":12}},"gc":"0","task":{"tid":"0","ti":"5","ht":0},"nc":1,"df":0,"mac":{"lv":"12","exp":989,"en":"133.00"},
    "npt":
      ["501","502","508","509","510","521","504","505","507","520","512","511","513","522","524","525","515","516","514","523","526"],
    "sks":
      [{"id":101,"lv":"1"},{"id":100,"lv":"1"},{"id":102,"lv":"1"}],
   "wt":"3",
   "lu":{"fl":0},
   "re":{"c":-1},
   "ti":1263460473,
   "sn":"happyRanchZone",
   "cmd":1002
  }
 }
}

json2.txt文件内容为：

{
 "list":
 {
  "key":"fkey",
  "class":"compeditor",
  "caption":"公司信息",
  "showtype":1,
  "script":{
   "main":{"key":11100003,"step":1}
  }
 },
 "editer":
 {
  "caption":"公司信息"
 }
}