In this article, we review a utility function, safeJsonParse in Suna codebase. Suna is an open source generalist AI agent. We will look at:
Where is this function, safeJsonParse, called?
What is its purpose?
safeJsonParse declaration.
Where is this function, safeJsonParse, called?
This safeJsonParse function is called at line 754 in [threadId]/page.tsx.
if (resultMessage) {
// Determine tool name from assistant message content
let toolName = 'unknown';
try {
// Try to extract tool name from content
const xmlMatch = assistantMsg.content.match(/<([a-zA-Z\-_]+)(?:\s+[^>]*)?>|<([a-zA-Z\-_]+)(?:\s+[^>]*)?\/>/);
if (xmlMatch) {
toolName = xmlMatch[1] || xmlMatch[2] || 'unknown';
} else {
// Fallback to checking for tool_calls JSON structure
const assistantContentParsed = safeJsonParse<{ tool_calls?: { name: string }[] }>(assistantMsg.content, {});
if (assistantContentParsed.tool_calls && assistantContentParsed.tool_calls.length > 0) {
toolName = assistantContentParsed.tool_calls[0].name || 'unknown';
}
}
} catch {}
What is safeJsonParse util purpose?
The comment just above this function call in [threadId]/page.tsx explains its purpose.
// Fallback to checking for tool_calls JSON structure
const assistantContentParsed = safeJsonParse<{ tool_calls?: { name: string }[] }>(assistantMsg.content, {});
if (assistantContentParsed.tool_calls && assistantContentParsed.tool_calls.length > 0) {
toolName = assistantContentParsed.tool_calls[0].name || 'unknown';
}
safeJsonParse declaration
// Helper function to safely parse JSON strings from content/metadata
export function safeJsonParse<T>(jsonString: string | undefined | null, fallback: T): T {
if (!jsonString) {
return fallback;
}
try {
return JSON.parse(jsonString);
} catch (e) {
// console.warn('Failed to parse JSON string:', jsonString, e); // Optional: log errors
return fallback;
}
}
This above code snippet is picked from components/thread/utils.ts.
All it does is simply parse the jsonString and in case this parsing fails, return a fallback which is a parameter of safeJsonParse function. Interestingly, console.warn is commented.
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