我如何以易于阅读(供人类阅读)的格式显示JSON?我主要寻找缩进和空白,甚至是颜色/字体样式等。


当前回答

以下是如何在不使用本机函数的情况下打印。

function pretty(ob, lvl = 0) {

  let temp = [];

  if(typeof ob === "object"){
    for(let x in ob) {
      if(ob.hasOwnProperty(x)) {
        temp.push( getTabs(lvl+1) + x + ":" + pretty(ob[x], lvl+1) );
      }
    }
    return "{\n"+ temp.join(",\n") +"\n" + getTabs(lvl) + "}";
  }
  else {
    return ob;
  }

}

function getTabs(n) {
  let c = 0, res = "";
  while(c++ < n)
    res+="\t";
  return res;
}

let obj = {a: {b: 2}, x: {y: 3}};
console.log(pretty(obj));

/*
  {
    a: {
      b: 2
    },
    x: {
      y: 3
    }
  }
*/

其他回答

出于调试目的,我使用:

console.debug("%o", data);

https://getfirebug.com/wiki/index.php/Console_APIhttps://developer.mozilla.org/en-US/docs/DOM/console

这里有一些东西来修饰这个老掉牙但很好的问题。如果您想将格式化的对象转储到控制台,但它仍像一团包裹的乱麻一样转储,隐藏字符如下???

'{\n    "_id": "630577bba145ff4f1",\n    "role": "user"}'

但你想要这种可爱??:

{
    "_id": "630557672d877bba145ff4f1",
    "role": "user"
}

诀窍是将JSON.stringify()包装在console.log()语句中。如果你讨厌打字,尝试构建代码段来完成繁重的工作。。。

如果您正在处理大型对象,这非常有用。

在浏览器开发工具中的“代码段”部分添加一个代码段,如下所示(更多…):

let o = <object to print>
console.log(JSON.stringify(o, null, 4))
console.log(o)

然后简单地替换为对象(可以从当前上下文中获得)并运行代码段。

对Ruby的其他漂亮打印机不满意,我自己编写了(NeatJSON),然后将其移植到JavaScript,包括一个免费的在线格式化程序。该代码在MIT许可证下是免费的(相当宽松)。

功能(全部可选):

设置线宽并换行,使对象和数组在合适时保持在同一行上,否则每行换行一个值。如果愿意,对对象关键点排序。对齐对象关键点(对齐冒号)。将浮点数格式化为特定的小数位数,而不打乱整数。“短”换行模式将左括号和右括号/大括号与值放在同一行,提供一些人更喜欢的格式。对数组和对象的间距、括号之间、冒号和逗号之前/之后进行精细控制。函数可用于web浏览器和Node.js。

我将在这里复制源代码,这样这不仅仅是一个库的链接,但我鼓励您转到GitHub项目页面,因为它将保持最新,而下面的代码不会。

(function(exports){
exports.neatJSON = neatJSON;

function neatJSON(value,opts){
  opts = opts || {}
  if (!('wrap'          in opts)) opts.wrap = 80;
  if (opts.wrap==true) opts.wrap = -1;
  if (!('indent'        in opts)) opts.indent = '  ';
  if (!('arrayPadding'  in opts)) opts.arrayPadding  = ('padding' in opts) ? opts.padding : 0;
  if (!('objectPadding' in opts)) opts.objectPadding = ('padding' in opts) ? opts.padding : 0;
  if (!('afterComma'    in opts)) opts.afterComma    = ('aroundComma' in opts) ? opts.aroundComma : 0;
  if (!('beforeComma'   in opts)) opts.beforeComma   = ('aroundComma' in opts) ? opts.aroundComma : 0;
  if (!('afterColon'    in opts)) opts.afterColon    = ('aroundColon' in opts) ? opts.aroundColon : 0;
  if (!('beforeColon'   in opts)) opts.beforeColon   = ('aroundColon' in opts) ? opts.aroundColon : 0;

  var apad  = repeat(' ',opts.arrayPadding),
      opad  = repeat(' ',opts.objectPadding),
      comma = repeat(' ',opts.beforeComma)+','+repeat(' ',opts.afterComma),
      colon = repeat(' ',opts.beforeColon)+':'+repeat(' ',opts.afterColon);

  return build(value,'');

  function build(o,indent){
    if (o===null || o===undefined) return indent+'null';
    else{
      switch(o.constructor){
        case Number:
          var isFloat = (o === +o && o !== (o|0));
          return indent + ((isFloat && ('decimals' in opts)) ? o.toFixed(opts.decimals) : (o+''));

        case Array:
          var pieces  = o.map(function(v){ return build(v,'') });
          var oneLine = indent+'['+apad+pieces.join(comma)+apad+']';
          if (opts.wrap===false || oneLine.length<=opts.wrap) return oneLine;
          if (opts.short){
            var indent2 = indent+' '+apad;
            pieces = o.map(function(v){ return build(v,indent2) });
            pieces[0] = pieces[0].replace(indent2,indent+'['+apad);
            pieces[pieces.length-1] = pieces[pieces.length-1]+apad+']';
            return pieces.join(',\n');
          }else{
            var indent2 = indent+opts.indent;
            return indent+'[\n'+o.map(function(v){ return build(v,indent2) }).join(',\n')+'\n'+indent+']';
          }

        case Object:
          var keyvals=[],i=0;
          for (var k in o) keyvals[i++] = [JSON.stringify(k), build(o[k],'')];
          if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
          keyvals = keyvals.map(function(kv){ return kv.join(colon) }).join(comma);
          var oneLine = indent+"{"+opad+keyvals+opad+"}";
          if (opts.wrap===false || oneLine.length<opts.wrap) return oneLine;
          if (opts.short){
            var keyvals=[],i=0;
            for (var k in o) keyvals[i++] = [indent+' '+opad+JSON.stringify(k),o[k]];
            if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
            keyvals[0][0] = keyvals[0][0].replace(indent+' ',indent+'{');
            if (opts.aligned){
              var longest = 0;
              for (var i=keyvals.length;i--;) if (keyvals[i][0].length>longest) longest = keyvals[i][0].length;
              var padding = repeat(' ',longest);
              for (var i=keyvals.length;i--;) keyvals[i][0] = padRight(padding,keyvals[i][0]);
            }
            for (var i=keyvals.length;i--;){
              var k=keyvals[i][0], v=keyvals[i][1];
              var indent2 = repeat(' ',(k+colon).length);
              var oneLine = k+colon+build(v,'');
              keyvals[i] = (opts.wrap===false || oneLine.length<=opts.wrap || !v || typeof v!="object") ? oneLine : (k+colon+build(v,indent2).replace(/^\s+/,''));
            }
            return keyvals.join(',\n') + opad + '}';
          }else{
            var keyvals=[],i=0;
            for (var k in o) keyvals[i++] = [indent+opts.indent+JSON.stringify(k),o[k]];
            if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
            if (opts.aligned){
              var longest = 0;
              for (var i=keyvals.length;i--;) if (keyvals[i][0].length>longest) longest = keyvals[i][0].length;
              var padding = repeat(' ',longest);
              for (var i=keyvals.length;i--;) keyvals[i][0] = padRight(padding,keyvals[i][0]);
            }
            var indent2 = indent+opts.indent;
            for (var i=keyvals.length;i--;){
              var k=keyvals[i][0], v=keyvals[i][1];
              var oneLine = k+colon+build(v,'');
              keyvals[i] = (opts.wrap===false || oneLine.length<=opts.wrap || !v || typeof v!="object") ? oneLine : (k+colon+build(v,indent2).replace(/^\s+/,''));
            }
            return indent+'{\n'+keyvals.join(',\n')+'\n'+indent+'}'
          }

        default:
          return indent+JSON.stringify(o);
      }
    }
  }

  function repeat(str,times){ // http://stackoverflow.com/a/17800645/405017
    var result = '';
    while(true){
      if (times & 1) result += str;
      times >>= 1;
      if (times) str += str;
      else break;
    }
    return result;
  }
  function padRight(pad, str){
    return (str + pad).substring(0, pad.length);
  }
}
neatJSON.version = "0.5";

})(typeof exports === 'undefined' ? this : exports);

如果您需要在文本区域中使用此选项,则接受的解决方案将不起作用。

<textarea id='textarea'></textarea>

$(“#textarea”).append(格式JSON(JSON.stringify(jsonobject),true));

function formatJSON(json,textarea) {
    var nl;
    if(textarea) {
        nl = "&#13;&#10;";
    } else {
        nl = "<br>";
    }
    var tab = "&#160;&#160;&#160;&#160;";
    var ret = "";
    var numquotes = 0;
    var betweenquotes = false;
    var firstquote = false;
    for (var i = 0; i < json.length; i++) {
        var c = json[i];
        if(c == '"') {
            numquotes ++;
            if((numquotes + 2) % 2 == 1) {
                betweenquotes = true;
            } else {
                betweenquotes = false;
            }
            if((numquotes + 3) % 4 == 0) {
                firstquote = true;
            } else {
                firstquote = false;
            }
        }

        if(c == '[' && !betweenquotes) {
            ret += c;
            ret += nl;
            continue;
        }
        if(c == '{' && !betweenquotes) {
            ret += tab;
            ret += c;
            ret += nl;
            continue;
        }
        if(c == '"' && firstquote) {
            ret += tab + tab;
            ret += c;
            continue;
        } else if (c == '"' && !firstquote) {
            ret += c;
            continue;
        }
        if(c == ',' && !betweenquotes) {
            ret += c;
            ret += nl;
            continue;
        }
        if(c == '}' && !betweenquotes) {
            ret += nl;
            ret += tab;
            ret += c;
            continue;
        }
        if(c == ']' && !betweenquotes) {
            ret += nl;
            ret += c;
            continue;
        }
        ret += c;
    } // i loop
    return ret;
}

我使用JSONView Chrome扩展插件(它非常漂亮:):

编辑:添加了jsonreport.js

我还发布了一个在线独立的JSON漂亮打印查看器jsonreport.js,它提供了一个可读的HTML5报告,可以用来查看任何JSON数据。

您可以在新的JavaScript HTML5报告格式中阅读更多关于该格式的信息。