How do I fix invalid JSON?

Question

Accepted Answer

JSON Copilot fixes invalid JSON two ways. The validator points at each syntax error so you can correct it by hand, and the AI Fix & Validate action repairs the whole document in one click. Paste your broken JSON into the editor and use whichever is faster.

Fix it in one click

Paste the broken JSON into the editor.
Open AI Copilot from the left sidebar and choose Fix & Validate.
The AI returns valid, formatted JSON. Click Apply to Input to replace your text.

Common reasons JSON is invalid

Problem	Looks like	Fix
Unquoted key	`name: "Ada"`	Wrap the key in double quotes
Single quotes	`'Ada'`	JSON requires double quotes
Trailing comma	`["a", "b",]`	Remove the comma after the last item
Missing bracket	`{ "a": 1`	Close the object or array
Python literals	`True / None`	JSON uses `true` and `null`
Comments	`// note`	Standard JSON has no comments

For the full rules, see JSON syntax rules.

Fix it by hand with the validator

The editor validates as you type and marks the exact line and column of each error with a message. Work down the list, fix each one, and the red markers clear when the JSON parses. This keeps everything in your browser and costs nothing. See understanding validation errors for what each message means, or open the JSON validator.

Fix it automatically with AI

When a payload has several problems at once, the Fix & Validate action is faster. It reads the broken text, repairs the syntax, and returns valid JSON you can apply in one click. Here is a typical repair:

Before

{
  name: 'Ada',
  "roles": ["admin", "editor",],
  "active": True
}

After

{
  "name": "Ada",
  "roles": ["admin", "editor"],
  "active": true
}

Fix changes syntax, not your data. It quotes keys, removes trailing commas, and closes brackets without adding or renaming fields. It is an AI Copilot action, so it needs sign-in and uses credits priced by the size of your JSON. See AI Copilot features and credits and pricing.

Once the JSON is valid, format it to clean up the indentation, or explore it in the tree view.

How do I fix invalid JSON?

Fix it in one click

Common reasons JSON is invalid

Fix it by hand with the validator

Fix it automatically with AI

Still Have Questions?