Where find good json formater and validation?

Question

Emacs 26.1. Windows 10

It's has function json-pretty-print . But it not enough for me.
Has any another better json formater and validator?
I mean the next.

Suppose I has error on json on line 26. I missed ",".
But json-pretty-print get me strange error message:

Json readtable error: 93

I don't understand this message. What does it mean?
Why simple not get message something like this:

Error: Parse error on line 26:
...n1_FR"           }       ]   }   "loyalty": true,    "u
-------------------^
Expecting 'EOF', '}', ',', ']', got 'STRING'

So that is the reason why I need better json validator and formater.

ebpa · Answer

I'm really curious about why you feel json-pretty-print is not good enough.

Perhaps you don't like needing to call it manually?  You could set it to run whenever you save the file:

(add-hook
 'json-mode-hook
 (lambda ()
   (add-hook 'before-save-hook 'json-pretty-print-buffer t t)))

If you'd still like an alternative, I highly recommend prettier-mode.  It's a minor mode that runs the file through prettier on save.  In circumstances with invalid JSON it does give you diagnostic output (but does not enforce strict JSON AFAIK.  For example:

prettier errors:
[error] stdin: SyntaxError: Unexpected token, expected "," (4:7)
[error]   2 |   "foo": {
[error]   3 |       "bar": "baz"
[error] > 4 |       "blah": "blooh"
[error]     |       ^
[error]   5 |   }
[error]   6 | }
[error]   7 |

Where find good json formater and validation?

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