What exactly is checked?

Syntax against RFC 8259: balanced braces and brackets, quoted keys and strings, valid number and escape forms, and no trailing content after the top-level value.

Does it validate against a JSON Schema?

Not yet. This checks whether the document parses, not whether it matches a contract of expected fields and types.

Why does it report only one error?

A JSON parser stops at the first token it cannot interpret, because everything after it is ambiguous. Fix that one and validate again.

The line number looks one off — why?

The position is where the parser gave up, which can be past the real mistake. A missing comma is usually reported at the start of the following key.

Is my JSON uploaded to be checked?

No. The parse happens in your tab, which is what makes it safe for tokens, customer records and other payloads you should not paste into a web service.

JSON Kitchen

Validate JSON and find the first error

Line, column and reason for the first thing a parser rejects.

Paste JSON

or drag & drop a JSON file

Empty document

UTF-8Lines 0Characters 0

What it does

Validation answers one question: would a parser accept this? The answer comes from the browser's own JSON parser, so it matches what your application, gateway and CI job will do with the same bytes. When it fails you get the position and a button that moves the cursor there.

Example

Input

{
  "user": {
    "name": "ada",
  }
}

Reported

Invalid JSON · Line 4 · Col 3
Expected double-quoted property name

Highlights

Exact line and column for the first syntax error
Plain-language reason, such as a missing comma or brace
Click the banner to move the cursor to the offending character
Inspection only — the validator can never rewrite your document
Errors stay on screen until you fix them, successes fade

Frequently asked questions

What exactly is checked?: Syntax against RFC 8259: balanced braces and brackets, quoted keys and strings, valid number and escape forms, and no trailing content after the top-level value.
Does it validate against a JSON Schema?: Not yet. This checks whether the document parses, not whether it matches a contract of expected fields and types.
Why does it report only one error?: A JSON parser stops at the first token it cannot interpret, because everything after it is ambiguous. Fix that one and validate again.
The line number looks one off — why?: The position is where the parser gave up, which can be past the real mistake. A missing comma is usually reported at the start of the following key.
Is my JSON uploaded to be checked?: No. The parse happens in your tab, which is what makes it safe for tokens, customer records and other payloads you should not paste into a web service.

Back to the editor

JSON Kitchen

Validate JSON and find the first error

Line, column and reason for the first thing a parser rejects.

Paste JSON

or drag & drop a JSON file

Empty document

UTF-8Lines 0Characters 0

What it does

Example

Input

{
  "user": {
    "name": "ada",
  }
}

Reported

Invalid JSON · Line 4 · Col 3
Expected double-quoted property name

Highlights

Exact line and column for the first syntax error
Plain-language reason, such as a missing comma or brace
Click the banner to move the cursor to the offending character
Inspection only — the validator can never rewrite your document
Errors stay on screen until you fix them, successes fade

Frequently asked questions

What exactly is checked?: Syntax against RFC 8259: balanced braces and brackets, quoted keys and strings, valid number and escape forms, and no trailing content after the top-level value.
Does it validate against a JSON Schema?: Not yet. This checks whether the document parses, not whether it matches a contract of expected fields and types.
Why does it report only one error?: A JSON parser stops at the first token it cannot interpret, because everything after it is ambiguous. Fix that one and validate again.
The line number looks one off — why?: The position is where the parser gave up, which can be past the real mistake. A missing comma is usually reported at the start of the following key.
Is my JSON uploaded to be checked?: No. The parse happens in your tab, which is what makes it safe for tokens, customer records and other payloads you should not paste into a web service.

Back to the editor

Validate JSON and find the first error

What it does

Example

Highlights

Frequently asked questions

Related tools

Validate JSON and find the first error

What it does

Example

Highlights

Frequently asked questions

Related tools