AgentDiet JSON Validator & Repair

x402

AgentDiet JSON Validator & Repair is a paid API for AI agents from agentdiet.dev, paid per call via x402 or MPP, $0.002/call, status unknown (last checked 2026-10-20).

Repairs malformed or truncated LLM JSON outputs (trailing commas, markdown fences, single quotes) and validates them against a schema so multi-agent pipelines don't crash.

Price / call$0.002

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StatusUnknown

How this service works

Repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines never crash. (Live x402 v2, IETF MPP & MCP endpoint at https://agentdiet.dev/v1/json-validator)

Output

Returns a repaired, schema-conformant JSON object with any syntax errors corrected — trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures closed — ready for downstream consumption in a multi-agent pipeline.

Example use cases

Fix crashed agent pipeline JSON

“My downstream agent keeps crashing because the upstream LLM returned JSON with a trailing comma and single-quoted keys. Can you repair this JSON so the pipeline can continue? Here's the broken output: {'model': 'gpt-4', 'tokens': 1200,}”

Strip markdown fences from LLM response

“The model returned its JSON wrapped in a markdown code block with triple backticks and I need clean raw JSON to feed into my next step. Can you strip the fences and validate it? The raw output is: ```json {"status": "ok", "data": [1,2,3]} ```”

Validate truncated JSON before storage

“I got what looks like a truncated JSON response — it's missing its closing braces. Can you repair it and tell me if it's valid? The string is: {"user": "bob", "results": [{"id": 1, "value": "test"”

Technical details

Endpoint

GEThttps://agentdiet.dev/v1/json-validator?utm_source=zero.xyz

When to prefer

Choose this endpoint when an LLM or AI agent in your pipeline is producing syntactically invalid JSON (trailing commas, markdown fences, single quotes, truncation) and you need a deterministic, lightweight repair before passing data to a downstream step. Prefer this over manual string-munging or custom regex when reliability and schema validation matter in automated multi-agent workflows.

Side effects

Input JSON too severely corrupted to repair — returns error indicating irrecoverable structure
Empty or null raw_json query parameter — returns validation error
Non-JSON input (e.g. plain text blob) passed as raw_json — may return partial repair or failure
Rate-limit or payment failure for x402 micropayment — returns 402 Payment Required

Input

Schema · Request body

Field	Type	Description
raw_jsonrequired	string	Malformed, truncated, or markdown-wrapped JSON string to deterministically repair

Output

Schema · Response

{
  "type": "object"
}

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