louislam/uptime-kuma · error · Error

Conditions must be valid JSON

Error message

Conditions must be valid JSON: ${e.message}

What it means

validate() runs JSON.parse on the conditions field used by conditional monitoring logic. It must be valid JSON.

Solutions

1. Provide conditions as valid JSON in the documented shape
2. Validate with JSON.parse before saving

if (monitor.conditions) { JSON.parse(monitor.conditions); } // throws if invalid

function isValidJsonField(v) { if (!v) return true; try { JSON.parse(v); return true; } catch { return false; } }

try { monitor.validate(); await save(monitor); } catch (e) { /* surface e.message */ }

When it happens

Trigger: conditions holds a non-JSON string when the monitor relies on conditional rules.

Common situations: Hand-editing the conditions outside the UI; partial/corrupted JSON from a migration.

Related errors

• Accepted status codes must be valid JSON
• Additional Headers is not a valid JSON
• Additional Headers is not a valid JSON
• Headers must be valid JSON
• Invalid RabbitMQ Nodes

AI-assisted analysis of louislam/uptime-kuma@6b5ea01557 (2026-08-12). Data as JSON: /api/errors/684ddfe6651d42a5. Report an issue: GitHub.

Appendix: source

Thrown at server/model/monitor.js:1673

                JSON.parse(this.kafkaProducerSaslOptions);
            } catch (e) {
                throw new Error(`Kafka Producer SASL Options must be valid JSON: ${e.message}`);
            }
        }

        if (this.rabbitmqNodes) {
            try {
                JSON.parse(this.rabbitmqNodes);
            } catch (e) {
                throw new Error(`RabbitMQ Nodes must be valid JSON: ${e.message}`);
            }
        }

        if (this.conditions) {
            try {
                JSON.parse(this.conditions);
            } catch (e) {
                throw new Error(`Conditions must be valid JSON: ${e.message}`);
            }
        }

        if (this.headers) {
            try {
                JSON.parse(this.headers);
            } catch (e) {
                throw new Error(`Headers must be valid JSON: ${e.message}`);
            }
        }

        if (this.accepted_statuscodes_json) {
            try {
                JSON.parse(this.accepted_statuscodes_json);
            } catch (e) {
                throw new Error(`Accepted status codes must be valid JSON: ${e.message}`);
            }
        }

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