JSON Repair Tool
Repair invalid JSON copied from logs, LLM output, JavaScript objects, Python dictionaries, config files, and API examples. Fix comments, trailing commas, single quotes, unquoted keys, and Python literals in your browser.
Reviewed May 25, 2026. Privacy model: tool input is processed in your browser and is not uploaded to BytePane servers.
Repair log
- - Removed JavaScript-style comments.
- - Quoted unquoted object keys.
- - Converted single-quoted strings to double-quoted JSON strings.
- - Converted Python literals True, False, and None to JSON values.
- - Removed trailing commas from arrays and objects.
Valid JSON output
The repaired output parses with JSON.parse and has been formatted with 2-space indentation.
Repair invalid JSON from logs, AI tools, and config snippets
Broken JSON often comes from copying examples out of JavaScript, Python, API logs, config files, markdown answers, or LLM responses. The most common issues are comments, trailing commas, single quotes, unquoted keys, smart quotes, and Python literals. BytePane repairs those common cases locally, then validates the result with the browser's native JSON parser.
This is designed for developer workflow speed: repair a malformed payload, copy the valid JSON, then send it to the JSON formatter, JSON Schema validator, JSONPath tester, JSON to TypeScript converter, or JSON to Zod generator.
Frequently Asked Questions
What can this JSON repair tool fix?
It can fix many common JSON problems: comments, trailing commas, single-quoted strings, unquoted object keys, smart quotes, and Python-style True, False, and None literals.
Is repaired JSON always correct?
No automated repair can guarantee intent. Always review the output when the source was badly corrupted, truncated, or ambiguous.
Does BytePane upload my JSON?
No. The repair runs in your browser using client-side JavaScript. Your JSON is not sent to a server.
Can I repair LLM-generated JSON?
Yes. This tool is useful when ChatGPT, Claude, Gemini, or another assistant returns JSON with comments, trailing commas, markdown-adjacent syntax, or JavaScript object notation.