将 Req.query 字符串格式化为 JavaScript Object

Question

I have a req.query from a get request

get <host>/api/tree/path-search?tree="{1:{2:{4:null,5:null},3:null}}"

How i convert it to this form in javaScript

const obj = { 1 : { 2 : { 4 : null, 5 : null },3 : null}};

is the const obj a JavaScript Object

Answer 1

I'd strongly suggest changing what you put in tree to JSON so you can use the built-in JSON parser ( JSON.parse ). The URI might look like this:

get <host>/api/tree/path-search?tree=%7B%221%22%3A%7B%222%22%3A%7B%224%22%3Anull%2C%225%22%3Anull%7D%2C%223%22%3Anull%7D%7D

...where that value for tree is the URI-encoded version of

{"1":{"2":{"4":null,"5":null},"3":null}}

Which is valid JSON that parses to what you want.

---

What you have now is a valid JavaScript object literal, but not valid JSON. That means you could evaluate it with something that evaluates (executes) JavaScript code like eval or new Function , but that executes arbitrary code , which you don't want to do on a server .

Alternatively, parse it with a JavaScript parser. There are several available for the Node.js environment. Then you'd walk through the resulting AST tree building the described object. Which is obviously a pain, which is why I'd use JSON. :-)