Automatically repair invalid or broken JSON in your browser. Paste your JSON and fix common syntax issues like trailing commas, comments, single quotes, and more, with local processing for maximum privacy.
JSON Repair is designed for JSON-like snippets copied from logs, browser consoles, documentation, or configuration files where common syntax mistakes are easy to make.
It attempts practical fixes and shows a repair summary so you can review what changed before copying the result.
The tool can repair syntax, but it cannot know missing business data or infer the intended value when a payload is incomplete.
Always validate the repaired output before using it in an API request, database migration, or production configuration.
Start with the malformed snippet, check the generated output, then use the validator and beautifier to confirm and inspect the final JSON.
This sequence gives you a strict JSON result without hiding the changes that were needed to get there.
JSON with comments, trailing commas, and single quotes
Input
{
name: 'John Doe',
age: 30,
hobbies: ['reading', 'coding',],
// trailing comma and comments
active: True,
}The same data after automatic repair
Input
{
"name": "John Doe",
"age": 30,
"hobbies": [
"reading",
"coding"
],
"active": true
}A JSON repair tool automatically fixes common syntax errors in invalid or broken JSON, such as trailing commas, comments, single quotes, and inconsistent boolean/null casing.
It can fix many common issues like trailing commas, JavaScript-style comments, single-quoted strings, unquoted keys, and basic boolean/null casing problems. Complex or heavily corrupted JSON may still require manual editing.
Paste your JSON (even if it is invalid) into the input area or upload a .json file. The tool will try to repair it automatically and show the repaired JSON on the right, which you can copy or download.
No. All repair work happens locally in your browser. We never send your data to a server or store it anywhere.