DataDoctor

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

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

JSON payload preflight

JSON Validator

Validate, format, minify and repair copied JSON before sending it to APIs, schemas or import pipelines.

Paste JSON or load the broken sample.

Validation uses JSON.parse in the browser. Repair loads jsonrepair on demand.

Next workflow

Continue the preflight

Repair broken JSON

Use the dedicated repair view for before and after review.

Validate JSON Schema

Check required fields, types and enum values.

Convert JSON to CSV

Prepare arrays or objects for spreadsheet import.

After the tool runs

JSON Validator 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

checking copied API payloads, config snippets and generated JSON before another system reads them.

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 Validator for real data work

JSON Validator 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.

  • Strict JSON syntax
  • Formatted output
  • Repair candidates
  • Next-step schema readiness

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.

  • Trailing commas
  • Unquoted keys
  • Single-quoted strings
  • Truncated objects or arrays

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: Copy the strict JSON into your API, schema validator or importer.

  1. Step 1

    Paste the JSON

  2. Step 2

    Validate syntax first

  3. Step 3

    Format or repair only after seeing the parser result

  4. Step 4

    Copy the strict JSON into your API, schema validator or importer

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.