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Clean up what your agents break.

Deterministic repair tools for AI agent workflows. We fix the messy, broken structured output that LLMs produce — so your pipelines don’t have to.

Try it on Apify

Pay-per-use on Apify. Apify account required.

// Before — raw LLM output

// After — cleaned by Yaupon Labs

{
  "name": "Alice",
  "role": "engineer",
  "active": true,
  "retries": 3
}

LLMs don’t follow instructions.

You asked for JSON. You got markdown code fences, single-quoted strings, trailing commas, and a paragraph of apology before the actual output. Your parser crashes. Your agent loop retries. Your pipeline burns tokens on a problem that shouldn’t exist.

Every malformed response is a failed agent run, a wasted LLM call, and a user waiting for nothing.

Deterministic repair. No guessing.

Strip & Extract

Removes code fences, wrapper text, and apology preamble. Extracts the one obvious JSON block from whatever the LLM decided to wrap it in.

Fix Common Breakage

Repairs unquoted keys, single-quoted strings, trailing commas, and invalid backslash escapes. Deterministic transforms — no LLM in the repair loop.

Honest Failure

Won’t invent missing values, silently merge duplicate keys, or guess between ambiguous JSON blocks. If it can’t fix it cleanly, it tells you why.

What it does. What it doesn’t.

Does

Strip code fences and wrapper text
Extract a single obvious JSON object/array
Repair a tested set of malformed JSON patterns
Apply lightweight schema coercion
Report exactly what changed

Doesn’t

Invent missing values
Choose between multiple JSON blocks
Silently accept duplicate-key ambiguity
Convert prose into JSON
Use an LLM to "fix" your LLM’s output

Try it yourself.

Paste broken LLM output below and see what gets repaired. This is a simplified client-side preview — the full tool on Apify handles more edge cases.

// Input — paste raw LLM output

Pricing & access

Pay-per-use on Apify

You pay only for the compute your runs consume. Apify bills in compute units (1 CU = 1 GB-hour of RAM). A typical run uses minimal resources — most JSON repairs complete in under a second.

No subscription required

Apify account required (sign up free, add credits to run)

Call via Apify API for programmatic access

Expanding access

Apify is the only way to use Agent Output Cleaner today. We’re working on additional access methods:

MCP server — for agent tool-calling workflows

npm package — for direct integration

Ship agents that don’t break in production.

Try it on Apify

Pay-per-use on Apify. Apify account required.