DataDoctor

Runs entirely in your browser — no uploads, no saved snippets, no public links.

Paste a file, inspect the issues, export reviewed output.

JSON syntax repair

JSON Repair

Repair common JSON mistakes such as trailing commas, single quotes, comments and unquoted keys.

Paste invalid JSON or load the included broken sample.

Next workflow

Continue the preflight

JSON Validator

Validate the repaired output before using it.

JSON Formatter

Pretty-print repaired JSON for review.

JSON Schema Validator

Check required fields and types after repair.

After the tool runs

JSON Repair review guide

Use the tool above first. The supporting notes below help you interpret the result, fix the right issues in the right order, and choose the next DataDoctor tool without pushing SEO content above the actual task.

Best input

turning messy JSON-like text into a reviewable JSON candidate without uploading the pasted content.

Output to keep

Copy strict JSON only after validation or repair passes.

Next check

Use schema validation when the payload must match an API contract, import field list or queue message shape.

What it checks

JSON Repair for real data work

JSON Repair is strongest when you use it before a formatter, converter or downstream API call. It helps make the parse state visible before you change the payload.

  • Common broken JSON patterns
  • Repair candidate output
  • Original versus repaired comparison
  • Follow-up validation path

Fix these first

Common errors to review before downstream work

Most failures come from small file issues that become expensive only after an API call, import job or spreadsheet cleanup. Fix blocking errors first, then re-run the same tool before moving forward.

  • Comments inside JSON
  • Markdown code fences
  • LLM output with prose
  • Missing quotes or commas

Recommended workflow

Run the check in this order

If the tool reports a parse or structure problem, fix that first and re-run the same check. If it passes, move to the next workflow step: Validate the repaired candidate before using it.

  1. Step 1

    Paste the broken snippet

  2. Step 2

    Run repair

  3. Step 3

    Compare the before and after blocks

  4. Step 4

    Validate the repaired candidate before using it

How to interpret a passing result

A pass means this specific preflight did not find the issues listed above. It is not a guarantee that the target system will accept every row, field, custom mapping or account-specific rule.

Formatting, minifying or repairing JSON proves syntax only. It does not prove the payload has the right required fields or business values.