earendil-works/pi · error · Error

Token exchange returned invalid JSON. url=${TOKEN_URL}; body

Error message

Token exchange returned invalid JSON. url=${TOKEN_URL}; body=${responseBody}; details=${formatErrorDetails(error)}

What it means

Error "Token exchange returned invalid JSON. url=${TOKEN_URL}; body=${responseBody}; details=${formatErrorDetails(error)}" thrown in earendil-works/pi.

Source

Thrown at packages/ai/src/auth/oauth/anthropic.ts:221

				client_id: CLIENT_ID,
				code,
				state,
				redirect_uri: redirectUri,
				code_verifier: verifier,
			},
			signal,
		);
	} catch (error) {
		throw new Error(
			`Token exchange request failed. url=${TOKEN_URL}; redirect_uri=${redirectUri}; response_type=authorization_code; details=${formatErrorDetails(error)}`,
		);
	}

	let tokenData: { access_token: string; refresh_token: string; expires_in: number };
	try {
		tokenData = JSON.parse(responseBody) as { access_token: string; refresh_token: string; expires_in: number };
	} catch (error) {
		throw new Error(
			`Token exchange returned invalid JSON. url=${TOKEN_URL}; body=${responseBody}; details=${formatErrorDetails(error)}`,
		);
	}

	return {
		type: "oauth",
		refresh: tokenData.refresh_token,
		access: tokenData.access_token,
		expires: Date.now() + tokenData.expires_in * 1000 - 5 * 60 * 1000,
	};
}

async function loginAnthropic(interaction: ProviderAuthInteraction): Promise<OAuthCredential> {
	const { verifier, challenge } = await generatePKCE();
	const server = await startCallbackServer(verifier);
	const manualAbort = new AbortController();
	const onAbort = () => server.cancelWait();
	interaction.signal.addEventListener("abort", onAbort, { once: true });

View on GitHub (pinned to 4af9d21d3b)

Solutions

1. Inspect the response body; the token endpoint returned non-JSON, so retry or check the endpoint.

When it happens

Trigger: Thrown at packages/ai/src/auth/oauth/anthropic.ts:221 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of earendil-works/pi@4af9d21d3b (2026-08-24). Data as JSON: /api/errors/59bc1b71cb70cfe9. Report an issue: GitHub.