can1357/oh-my-pi · error

No JSON payload found in response

Error message

No JSON payload found in response

What it means

parseJsonPayload extracts a JSON object from raw model text. It accepts a pure JSON object, or finds the first {...} block via regex; if no {...} substring exists at all it throws. This guards the commit analysis pipeline against responses containing no JSON object.

Source

Thrown at packages/coding-agent/src/commit/utils.ts:23

	return message.content.find(content => content.type === "toolCall" && content.name === name) as ToolCall | undefined;
}

export function extractTextContent(message: AssistantMessage): string {
	return message.content
		.filter(content => content.type === "text")
		.map(content => content.text)
		.join("")
		.trim();
}

export function parseJsonPayload(text: string): unknown {
	const trimmed = text.trim();
	if (trimmed.startsWith("{") && trimmed.endsWith("}")) {
		return JSON.parse(trimmed) as unknown;
	}
	const match = trimmed.match(/\{[\s\S]*\}/);
	if (!match) {
		throw new Error("No JSON payload found in response");
	}
	return JSON.parse(match[0]) as unknown;
}

export function normalizeAnalysis(parsed: {
	type: ConventionalAnalysis["type"];
	scope: string | null;
	details: Array<{ text: string; changelog_category?: ChangelogCategory; user_visible?: boolean }>;
	issue_refs: string[];
}): ConventionalAnalysis {
	return {
		type: parsed.type,
		scope: parsed.scope?.trim() || null,
		details: parsed.details.map(detail => ({
			text: detail.text.trim(),
			changelogCategory: detail.user_visible ? detail.changelog_category : undefined,
			userVisible: detail.user_visible ?? false,
		})),

View on GitHub (pinned to 9690622007)

Solutions

1. Retry generation with a stronger model or higher instruction adherence.
2. Inspect the raw response logged upstream to confirm the model ignored the JSON format and fix the prompt.
3. Ask the model to output only JSON (no prose, no code fences) or strip fences before parsing.
4. Handle the throw upstream and fall back to a manual/default commit flow.

Example fix

// before: model replied 'I cannot analyze this diff.'
parseJsonPayload(response) // throws
// after: prompt ends with
'Respond with a single JSON object and nothing else.'

function hasJsonPayload(text: string): boolean {
  const t = text.trim();
  if (t.startsWith("{") && t.endsWith("}")) return true;
  return /\{[\s\S]*\}/.test(t);
}

function isJsonObject(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}

try {
  const analysis = parseJsonPayload(rawResponse);
} catch (err) {
  if (err instanceof Error && err.message === "No JSON payload found in response") {
    // log rawResponse, retry generation or fall back to default flow
  } else throw err;
}

When it happens

Trigger: Calling parseJsonPayload (via parsed() or runEvalCompletion) with model output that contains no brace-delimited object — e.g. plain prose, a refusal message, an empty string, or the model describing results without emitting JSON.

Common situations: Model refused the task or answered conversationally instead of following the JSON format instruction; response truncated before any '{'; prompt template drifted so the JSON instruction was lost; tiny local model ignoring the schema.

Related errors

• Model output is not a JSON object
• Replacement text is not valid UTF-8: {err}
• V2 compaction stream parse failed: ${err instanceof Error ?
• OMP_AUTH_BROKER_ACCOUNT_POOL_FILE contains an empty provider
• OMP_AUTH_BROKER_ACCOUNT_POOL_FILE contains a provider id wit

AI-assisted analysis of can1357/oh-my-pi@9690622007 (2026-08-31). Data as JSON: /api/errors/6d3d4b03f516d9b1. Report an issue: GitHub.