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GigaJSON

JSON Repair

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Paste broken JSON and get valid JSON back. Repair handles missing or single quotes, missing commas and brackets, trailing commas, comments, cut-off documents, Python's True/False/None, JSONP, and JSON copied out of an AI chat with text around it. Each line it changed is listed.

How to use it

  1. Paste the broken JSON or open a file.
  2. The repaired JSON appears, with a list of the lines that changed.
  3. Copy or download it, or open it in GigaJSON to keep working on it.

Read more: How to fix invalid JSON: the 10 most common errors

Private, and made for big files

This tool runs in your browser, in a background worker: nothing you paste or open is uploaded, and nothing is kept after you leave. Input is limited to 128 MB. Processing runs in a background worker. If your connection drops while you're here, the tool keeps working. When one tool isn't enough, GigaJSON opens your data with a tree, a table, JSONPath/JMESPath/jq queries, transforms, diff and history.

Questions

What can it repair?

Keys without quotes, single or curly quotes, missing commas, missing closing brackets (cut-off JSON), trailing commas, // and /* */ comments, Python constants, MongoDB types like NumberLong(), JSONP, string concatenation, newline-delimited JSON and Markdown code fences.

What can't it repair?

Anything ambiguous, such as a doubled comma between values. Instead of guessing, it tells you the line and column.

Is my data uploaded?

No. The tool runs in your browser, in a background worker. Nothing you paste or open goes to a server, and nothing is kept after you leave the page.

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