AI JSON Repair
Fix broken LLM JSON — fences, truncation, unquoted keys, and JS literals. Rule-based today.
- 100% client-side · your data never leaves your browser
- Instant, no rate limits
- Free, no sign-up
AI-assisted — rule-based today.These tools use deterministic heuristics in your browser (no model API calls, no upload). We're validating demand before wiring real LLM backends.
Paste input to run repair.
Repair steps and heuristics appear here.
Overview
AI JSON Repair — Fix LLM & ChatGPT JSON Output
Repair broken JSON from large language models, chatbots, and copilots — markdown fences, preamble text, truncated objects, unquoted keys, trailing commas, and JavaScript literals like undefined and NaN. JsonDrift's AI JSON Repair runs an extended heuristic pipeline designed for LLM failure modes. Today it uses deterministic rules in your browser (no model API, no upload). The same product surface is built to accept real LLM backends later.
Why LLM JSON breaks
Models are trained on text, not parsers. They often wrap JSON in markdown, use single quotes, add trailing commas, or stop mid-object when hitting token limits. Production pipelines need a validation gate — this tool is that gate with an AI-native UX.
What the repair pipeline does
- Standard syntax fixes (quotes, keys, trailing commas, fences)
- Isolate JSON from surrounding LLM prose
- Normalize undefined, NaN, and Infinity to null
- Close unclosed brackets when truncation is detected
- Step-by-step insight log so you see what changed
AI today vs tomorrow
Rule-based repair is fast, private, and predictable — ideal for on-call debugging. JsonDrift is shipping AI-branded tools with transparent rule engines first to validate demand and UX. LLM-powered repair can plug into the same interface when you need semantic fixes rules cannot handle.
FAQ
Frequently asked questions
Does this call OpenAI or ChatGPT?
No. All processing is local heuristic repair — no external AI API.
How is this different from JSON Repair?
AI JSON Repair adds LLM-specific steps: prose isolation, truncation recovery, and JS literal normalization, plus an insights panel.
Is my LLM output uploaded?
Never. Everything runs in your browser.
Continue with a related tool
All tools- JSON Repair & Fix
Fix invalid JSON: trailing commas, quotes, unquoted keys, and LLM markdown fences.
- AI JSON Schema Enforcer
Auto-fix JSON to match a schema — coerce types, drop extras, fill required fields.
- AI JSON Token Counter
Estimate the LLM token count of a JSON payload for context budgeting.
- AI JSON Cleaner
Smart cleanup — remove nulls, empty strings, trim whitespace, drop empty objects.
- AI JSON Redactor
Mask passwords, API keys, PII, and secrets before pasting JSON into an LLM.
- AI JSON Explainer
Human-readable summary of JSON structure and field meanings from naming patterns.