🔗 JSON 合并工具JSON Merge Tool
把两个 JSON 深度合并成一个：嵌套对象逐层合并，冲突时可选以哪一方为准，数组可以替换、拼接、去重拼接或按位置合并。Deep-merge two JSON documents: nested objects merge level by level, you choose which side wins on conflicts, and arrays can be replaced, concatenated, de-duplicated or merged by index.
使用说明与常见问题How-to & FAQ
「JSON 合并工具」是什么？What is the JSON Merge Tool tool?
把两个 JSON 深度合并成一个：嵌套对象逐层合并，冲突时可选以哪一方为准，数组可以替换、拼接、去重拼接或按位置合并。Deep-merge two JSON documents: nested objects merge level by level, you choose which side wins on conflicts, and arrays can be replaced, concatenated, de-duplicated or merged by index.
如何使用「JSON 合并工具」？How do I use the JSON Merge Tool?
在第一个框粘贴 JSON A，在第二个框粘贴 JSON B，选择冲突规则和数组处理方式，下方实时显示合并结果。例如 {"a":{"x":1}} 与 {"a":{"y":2}} 合并为 {"a":{"x":1,"y":2}}。Paste JSON A in the first box and JSON B in the second, choose the conflict rule and array handling, and the merged result appears below. For example {"a":{"x":1}} + {"a":{"y":2}} gives {"a":{"x":1,"y":2}}.
冲突时以 A 为准是什么意思？What does "A wins" mean?
两边都有同一个键且值都是普通值（字符串、数字等）时，保留 A 的值；如果两边都是对象，仍会继续逐层合并，只在最底层的冲突上保留 A。When both sides have the same key with plain values (string, number…), A's value is kept; when both are objects they are still merged level by level and only the leaf conflicts keep A.
数组的四种合并方式有什么区别？How do the four array modes differ?
整体替换：用胜出一方的数组；拼接：A 的元素后接 B 的元素；拼接去重：拼接后去掉完全相同的元素；按位置合并：第 1 个和第 1 个合并、第 2 个和第 2 个合并，适合对象数组。Replace uses the winning side's array; Concatenate appends B's items after A's; Concatenate unique also drops exact duplicates; Merge by index merges item 1 with item 1, item 2 with item 2 — handy for arrays of objects.
「JSON 合并工具」免费吗？数据会上传吗？Is the JSON Merge Tool free? Is my data uploaded?
「JSON 合并工具」完全免费，无需注册或安装，手机和电脑都能用；所有处理都在你的浏览器本地完成，输入的内容和文件不会上传到服务器。The JSON Merge Tool is completely free with no sign-up or install and works on phones and desktops; everything runs locally in your browser and nothing you enter is uploaded.