Shim.so
JSON repair API for broken LLM outputs. Sub-50ms streaming.
Shim.so launched on March 10, 2026 with 2 votes, #5,166 of 23,380 launches that month.
What it does
LLMs break JSON constantly. Streaming cutoffs leave incomplete objects. Claude wraps valid JSON in markdown fences. GPT hallucinates trailing commas and unquoted keys. Your production app crashes. You rewrite prompts 47 times. Shim intercepts malformed LLM outputs and repairs them in sub-50ms. Real-time streaming support. Zero data persistence. Drop-in API for production AI agents. Fixes: Truncated objects, markdown wrappers, trailing commas, unquoted keys, NaN values, schema validation.
Repair malformed JSON from LLMs in sub-millisecond time. No retries, no buffering delays, no production failures. Start with 1,000 free repairs/month.
Shim intercepts malformed JSON from language models and repairs it in sub-millisecond time. Prevents production API failures caused by truncated JSON, markdown fences, and syntax errors. Repair broken JSON from LLMs as it streams. Sub-millisecond fixes. Zero data stored. No retries needed. { name: "Widget A", status: 'active', score: NaN, tags: ['new', 'promo',], } Repaired by Shim • Confidence: HIGH Sub-Millisecond Repair Repair engine runs in <0.1ms. Total API response in 5-15ms. 200x faster than OutputFixingParser. Repair JSON as it streams from your LLM. No waiting for complete output. Zero retries. Every repair includes a confidence level. Know when to trust the output or flag for…from shim.so
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