JSON数据反扁平化

它属于「JSON 工具」分类：JSON 的格式化、结构变换与各种数据格式互转。

• 把 <code>a.b.c</code> 形式的单层键值还原成<b>多层嵌套对象</b>。
• 同时识别 <code>list[0]</code> 与 <code>list.0</code> 两种数组写法，纯数字键会自动还原为数组。
• 分隔符需要与当初扁平化时使用的保持一致，否则无法正确切分路径。
• 常用于把语言包、配置表等扁平数据还原成程序需要的嵌套结构。

完全免费、无需注册；所有处理都在浏览器本地完成，文件不会上传到任何服务器。

相关关键词：JSON数据反扁平化、JSON 工具、反扁平、unflatten、还原、在线工具、免费

1. 打开工具：打开「JSON数据反扁平化」页面，无需注册、无需安装任何软件。
2. 准备输入：准备好要处理的内容或文件：文本可直接粘贴，文件可拖入页面（本工具属于「JSON 工具」）。
3. 填入内容：把内容粘贴进输入框，或把文件拖入页面；也可以点击「示例」先填入样例数据试一下。
4. 设置选项并处理：按需调整页面上的选项，然后点击处理 / 转换 / 生成按钮。
5. 获取结果：处理完全在浏览器本地完成，结果可直接复制或下载，文件不会上传到任何服务器。

Restore dotted-path objects into nested structures.

Belongs to “JSON Tools”: Format, transform and convert JSON to and from various data formats.

• Restores <code>a.b.c</code> flat keys back into a <b>multi-level nested object</b>.
• Both <code>list[0]</code> and <code>list.0</code> array forms are recognized; purely numeric keys become arrays automatically.
• The separator must match the one used when flattening, otherwise paths cannot be split correctly.
• Commonly used to rebuild flat data like language packs or config tables into the nested structure programs expect.

Free, no sign-up; everything runs locally in your browser and files are never uploaded.

Keywords: Unflatten JSON, JSON Tools, unflatten, restore, online tool, free

How to use it

1. Open the tool：Open the “Unflatten JSON” page — no sign-up and nothing to install.
2. Prepare the input：Prepare the content or file to process: paste text or drop a file onto the page (this tool belongs to “JSON Tools”).
3. Provide the input：Paste your content into the input box or drop a file onto the page; you can also click “Sample” to try example data first.
4. Adjust options and run：Adjust the options if needed, then click the process / convert / generate button.
5. Get the result：Everything runs locally in your browser; copy or download the result — your files are never uploaded.

FAQ

When is this useful?

When you get flat keys like <code>a.b.c</code> from a spreadsheet, env vars or i18n entries but your program needs a nested object, use this to rebuild it.

How are arrays detected?

If all keys at a level are consecutive numeric (or written as <code>[0]</code>), they become an array; a single non-numeric key makes it an object.

Output differs from the original?

The usual cause is a mismatched separator, or keys that themselves contain the separator. Make sure flatten and unflatten use the same separator setting.

More tools in JSON Tools

• JSON Formatter/Minifier — Beautify, minify, validate and highlight JSON.
• Sort JSON Keys — Recursively sort object keys alphabetically to ease diffing.
• Flatten JSON — Flatten nested structures into a.b.c single-level keys.
• JSON to CSV — Convert an array of objects into a downloadable CSV.
• CSV to JSON — Parse CSV text or files into a JSON array.
• JSON to Excel — Export an array of objects as an .xlsx workbook.
• Excel to JSON — Upload an Excel file and convert sheets to JSON.
• JSON to XML — Convert JSON structures into well-indented XML.
• XML to JSON — Parse an XML document into an equivalent JSON object.
• JSON to YAML — Convert JSON into more readable YAML.
• YAML to JSON — Parse YAML config into standard JSON.
• JSON to SQL — Generate INSERT statements and CREATE TABLE DDL from arrays.
• SQL to JSON — Reverse-engineer JSON data from INSERT statements.
• JSON to Base64 — Convert JSON to and from Base64 with UTF-8 support.
• JSON ⇄ Cookie — Convert between Cookie strings and JSON key-values.
• JSON Diff — Recursively compare two JSON documents, marking add/delete/change.