JSON Repair

What Is a JSON Repair Tool?

A JSON repair tool automatically fixes common mistakes in broken JSON so it can be parsed. Typical problems include missing commas, single quotes instead of double quotes, unquoted keys, trailing commas, and missing brackets. They often appear in hand-edited files, copied snippets, logs, and AI-generated output.

ToolsViewer's online JSON fixer tries to correct these issues and, when the result is valid, gives you neatly formatted JSON.

How to Use the JSON Repair Tool

Step 1: Add your broken JSON
Paste the invalid JSON, import a .json or .txt file, fetch a public URL, or load the sample.

Step 2: Click Repair
The tool looks for common syntax problems and fixes them.

Step 3: Review the output
Check the repaired JSON carefully. Repair makes best-guess fixes, so make sure the data is what you expect.

Step 4: Validate and save
Optionally confirm the result with JSON Validator, then copy or download it.

JSON Repair Features

• Automatic repair of common syntax problems
• Fixes for commas, quotes, keys, brackets, and trailing commas
• Pretty-printed output when the repair succeeds
• Sample, Import, Fetch URL, and Repair options
• Download and Send to other tools
• Private processing in your browser

Common Uses

Fix AI-generated JSON: Clean up output that is almost valid JSON.

Repair copied data: Fix JSON broken by copy and paste or truncation.

Recover hand-edited files: Fix small mistakes made while editing by hand.

Save debugging time: Skip the search for one missing character.

Supported Formats

• JSON-like text
• .json files
• .txt files
• Public URLs
• Output as formatted JSON

Automatic repair is best-effort. Always review the result before using it with important or production data.

Explore related tools like JSON Validator, JSON Minifier, and JSON Path Tester to validate, compress, and query JSON online.