What JSON errors can the repair tool fix?

The tool fixes missing closing brackets and braces, trailing commas, single quotes instead of double quotes, unquoted property names, missing commas, comments (// and /* */), and truncated JSON. It can often reconstruct valid JSON from partially broken input.

How does JSON Repair work?

The tool uses a parser that understands common JSON mistakes. It reads the input character by character, identifies structural problems, and applies the minimal fixes needed to produce valid JSON while preserving your original data.

Can JSON Repair fix my truncated API response?

In many cases, yes. If your JSON was cut off mid-stream (like a network timeout), the tool can close open strings, arrays, and objects to produce valid JSON. Some truncated data will obviously be lost.

Can it fix malformed AI JSON output?

Often, yes. AI-generated JSON commonly fails because of comments, single quotes, trailing commas, or partial objects. JSON Repair can usually clean those issues up so you can validate the output or pass it into a schema check.

Will the repair tool change my data?

The tool makes minimal changes — only what's needed to make the JSON valid. It preserves all your values, keys, and structure. The fixes applied are listed so you can review exactly what changed.

JSON-Reparatur

Häufige Fehler wie nachgestellte Kommas automatisch beheben

Broken JSON

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Repaired JSON

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Recover broken JSON instead of typing fixes by hand

AI tools and APIs don't always produce perfect JSON. Trailing commas, single quotes, comments, unquoted keys, half-truncated objects — every one of those will fail JSON.parse and stop your pipeline. A repair tool reads the broken input character by character and applies the minimum fixes needed to make it valid, preserving your data.

Use the repair tool when you need to

Fix malformed AI model output

Strip Markdown fences, repair single quotes, and close truncated objects so structured output becomes parseable.

Recover a half-broken API response

When a network blip cut a response mid-stream, repair closes open strings, arrays, and objects to salvage what arrived.

Clean up copied JSON from logs or chat

Logs often paste JSON with smart quotes, trailing commas, or extra wrapping — fix it instead of editing line by line.

How to repair JSON quickly

1
Paste the broken JSON into the editor.
2
Click Repair to apply the minimum fixes for valid syntax.
3
Validate the repaired output, then copy or feed it into the next step in your pipeline.

Keep going

Validate after repairing

Confirm the repaired output parses cleanly before feeding it into downstream code.

Repair and schema-validate at once

Combine repair with schema validation for AI model output and tool calls.

Format the result

Pretty-print the repaired JSON to read and review the changes.

Understand parser errors

Learn what each common error message means before deciding to repair.

Common repair workflows

Salvage AI tool-call output

Strip fences and trailing commentary from model output before passing it into a JSON parser.

Recover an interrupted API response

Close truncated objects and arrays to extract whatever data made it through the wire.

Clean up logged payloads

Repair JSON copied from log lines that lost or corrupted some characters in transit.

Häufig gestellte Fragen

Das Tool behebt fehlende schließende Klammern (] und }), trailing commas, einfache Anführungszeichen statt doppelter, nicht gequotete Property-Namen, fehlende Kommas, Kommentare (// und /* */) sowie abgeschnittenes (truncated) JSON. Oft lässt sich daraus wieder gültiges JSON rekonstruieren, selbst wenn der Input teilweise kaputt ist.

Das Tool nutzt einen Parser, der typische JSON-Fehler erkennt. Es liest den Input Zeichen für Zeichen, findet strukturelle Probleme und wendet die minimal nötigen Korrekturen an, um gültiges JSON zu erzeugen — dabei bleiben deine ursprünglichen Daten so weit wie möglich erhalten.

In vielen Fällen ja. Wenn dein JSON mitten im Stream abgebrochen ist (z. B. durch einen Network-Timeout), kann das Tool offene Strings, Arrays und Objekte schließen, sodass wieder valides JSON entsteht. Ein Teil der abgeschnittenen Daten geht dabei natürlich verloren.

Es werden nur minimale Änderungen vorgenommen — genau das, was nötig ist, damit das JSON valide ist. Werte, Keys und Struktur bleiben erhalten. Die angewendeten Fixes werden aufgelistet, damit du genau nachvollziehen kannst, was geändert wurde.