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Re: Parse a field in JSON given a path to the field
From: |
Tim Landscheidt |
Subject: |
Re: Parse a field in JSON given a path to the field |
Date: |
Wed, 26 Jan 2022 22:05:49 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) |
Husain Alshehhi <husain@alshehhi.io> wrote:
> Does emacs provide a function that can return a path from a JSON object? I
> find something like this useful if I want a field from a nested, large JSON.
> Here is an example of a JSON string
> ,----
> | {
> | "field" : {
> | "field1" : {
> | "field2" : {
> | "field3" : "value"
> | }
> | }
> | }
> `----
> I do something like:
> ,----
> | ;; assume that the value is in json-string
> | (let ((json (json-parse json-string))
> | (field (gethash "field" json))
> | (field1 (gethash "field1" field))
> | (field2 (gethash "field2" field1))
> | (field3 (gethash "field3" field2)))
> | ;; process field3
> | )
> `----
> I wonder if there is something like
> ,----
> | (let ((field3 (json-parse-path "field/field1/field2/field3" json-string)))
> | ;; process field3
> | )
> `----
If the path is fixed, you could also use let-alist:
| ELISP> (let ((json (json-parse-string "{\n \"field\": {\n \"field1\": {\n
\"field2\": {\n \"field3\": \"value\"\n }\n }\n }\n}\n"
| :object-type 'alist)))
| (let-alist json
| (message "field/field1/field2/field3 = %S"
.field.field1.field2.field3)))
| "field/field1/field2/field3 = \"value\""
| ELISP>
Tim
- Re: Parse a field in JSON given a path to the field,
Tim Landscheidt <=