Browser-based tool

JSON Cleanroom

Repair broken JSON, keep raw and repaired output separate, and validate the current result against JSON Schema without leaving the browser.

UseKit Home

Start with raw JSON

Paste broken JSON, open a file, or load a sample. The raw source stays separate from the repaired result.

Local processing Repair first Schema validation No signup

Privacy-safe default: raw JSON and schema text are not persisted. Only the current page session keeps them in memory.

Paste JSON or load a sample to begin.

Overview

Status strip, problem summary, repaired result, and detailed review panels stay in one workspace.

Problems summary

Paste JSON or load a sample to see parse status and quick findings.

    Current result

    The result view will update after parsing or repair.

    Paste JSON or load a sample to populate this panel.
    Detailed review

    Raw vs repaired diff

    Run repair to compare raw and repaired output line by line.

    Repair log

      Schema validation

      Starter schema profiles affect generated schemas only. Pasted schemas are validated as written.

      Paste a schema or generate a starter schema to validate the current result.

        What this tool does

        JSON Cleanroom repairs malformed JSON, keeps raw and repaired output separate, and validates the current result against JSON Schema locally.

        When to use it

        How to use it

        1. Paste broken JSON, open a file, or load a sample.
        2. Review parse status and click Repair JSON when the source is invalid.
        3. Paste or generate a schema, validate the current result, then copy or download the cleaned JSON.

        Privacy

        Core parsing, repair, diff review, tree view, and schema validation run in your browser. Raw JSON and raw schema are not persisted by default.

        FAQ

        Does repair overwrite my raw input?

        No. Raw input and repaired output stay separate until you explicitly choose Use repaired as source.

        Can I validate against my own schema?

        Yes. Paste any supported JSON Schema, choose a draft, and review path-based issues in the schema panel.

        What does the report download contain?

        The report contains statuses, counts, findings, and schema issues only. It does not include raw JSON, repaired JSON, or schema body text.

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        Last updated: March 16, 2026