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🔍 JSON Endpoint Tracker

\n view source\n

Add Endpoint

\n \n \n \n \n

\n\n \n \n","deleted",false,"label",[19,36],"c6a6e5a4-33cd-11f1-a7ac-42b51c65c3df",3,["D",1775709431907],0,"directory",[19],{"_34":102,"_13":103,"_37":104,"_39":-5,"_41":42,"_43":105,"_45":46,"_47":106,"_17":60,"_50":61,"_51":-5,"_53":54,"_55":-5,"_75":107,"_18":108},{"_34":57,"_13":19,"_37":40,"_39":-5,"_41":42,"_43":58,"_45":46,"_47":95,"_17":60,"_50":61,"_51":-5,"_53":54,"_55":-5,"_75":96,"_18":97},{"_34":87,"_13":88,"_37":89,"_39":-5,"_41":42,"_43":90,"_45":46,"_47":91,"_17":60,"_50":24,"_51":92,"_53":54,"_55":-5,"_75":93,"_18":94},{"_34":78,"_13":79,"_37":80,"_39":-5,"_41":42,"_43":81,"_45":46,"_47":82,"_17":49,"_50":83,"_51":84,"_53":54,"_55":-5,"_75":85,"_18":86},{"_34":68,"_13":69,"_37":70,"_39":-5,"_41":42,"_43":71,"_45":46,"_47":72,"_17":60,"_50":73,"_51":74,"_53":54,"_55":-5,"_75":76,"_18":77},"392c1d1a-33ce-11f1-8b7b-42b51c65c3df","poller.ts","392c1dce-33ce-11f1-8b7b-42b51c65c3df",7,["D",1775709624050],"interval","import { runMigrations } from \"./database/migrations.ts\";\nimport { getAllEndpoints, performCheck } from \"./database/queries.ts\";\n\n// Runs on a schedule to check all endpoints automatically\nexport default async function (_interval: Interval) {\n await runMigrations();\n const endpoints = await getAllEndpoints();\n console.log(`Polling ${endpoints.length} endpoint(s)...`);\n for (const ep of endpoints) {\n try {\n const result = await performCheck(ep);\n console.log(`[${ep.name}] status=${result.status} changed=${result.changed} valid_json=${result.is_valid_json}`);\n } catch (e: any) {\n console.error(`[${ep.name}] poller error: ${e.message}`);\n }\n }\n}\n","children",[],[69],"42a0dc1e-33ce-11f1-ab2c-42b51c65c3df","main.ts","39661c00-33cd-11f1-9fe0-42b51c65c3df",8,["D",1775709639917],"http","import { Hono } from \"npm:hono\";\nimport { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\nimport { parseVal, serveFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { runMigrations } from \"./database/migrations.ts\";\nimport {\n getAllEndpoints,\n getEndpointById,\n getLatestCheck,\n getCheckHistory,\n performCheck,\n} from \"./database/queries.ts\";\n\nconst app = new Hono();\napp.onError((err) => Promise.reject(err));\n\nawait runMigrations();\n\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\n// API: list endpoints with latest check\napp.get(\"/api/endpoints\", async (c) => {\n const endpoints = await getAllEndpoints();\n const result = [];\n for (const ep of endpoints) {\n const latest = await getLatestCheck(ep.id);\n result.push({ ...ep, latest_check: latest });\n }\n return c.json(result);\n});\n\n// API: add endpoint\napp.post(\"/api/endpoints\", async (c) => {\n const { name, url, alert_email } = await c.req.json();\n if (!name || !url) return c.json({ error: \"name and url required\" }, 400);\n const ins = await sqlite.execute({\n sql: `INSERT INTO endpoints (name, url, alert_email) VALUES (?, ?, ?)`,\n args: [name, url, alert_email || null],\n });\n return c.json({ id: ins.lastInsertRowid, name, url, alert_email: alert_email || null });\n});\n\n// API: update endpoint (name, url, alert_email)\napp.patch(\"/api/endpoints/:id\", async (c) => {\n const id = Number(c.req.param(\"id\"));\n const body = await c.req.json();\n const ep = await getEndpointById(id);\n if (!ep) return c.json({ error: \"not found\" }, 404);\n const name = body.name ?? ep.name;\n const url = body.url ?? ep.url;\n const alert_email = \"alert_email\" in body ? (body.alert_email || null) : ep.alert_email;\n await sqlite.execute({\n sql: `UPDATE endpoints SET name = ?, url = ?, alert_email = ? WHERE id = ?`,\n args: [name, url, alert_email, id],\n });\n return c.json({ id, name, url, alert_email });\n});\n\n// API: delete endpoint\napp.delete(\"/api/endpoints/:id\", async (c) => {\n const id = c.req.param(\"id\");\n await sqlite.execute({ sql: `DELETE FROM checks WHERE endpoint_id = ?`, args: [id] });\n await sqlite.execute({ sql: `DELETE FROM endpoints WHERE id = ?`, args: [id] });\n return c.json({ ok: true });\n});\n\n// API: check now\napp.post(\"/api/endpoints/:id/check\", async (c) => {\n const id = Number(c.req.param(\"id\"));\n const ep = await getEndpointById(id);\n if (!ep) return c.json({ error: \"not found\" }, 404);\n const result = await performCheck(ep);\n return c.json(result);\n});\n\n// API: history for endpoint\napp.get(\"/api/endpoints/:id/history\", async (c) => {\n const id = Number(c.req.param(\"id\"));\n const rows = await getCheckHistory(id, 20);\n return c.json(rows);\n});\n\n// Serve frontend HTML\napp.get(\"/*\", (c) => serveFile(\"/frontend/index.html\", import.meta.url));\n\nexport default app.fetch;\n",[],[79],"28648a0e-33cd-11f1-ba79-42b51c65c3df","README.md","28648aae-33cd-11f1-ba79-42b51c65c3df",1,["D",1775709166393],"# json-endpoint-tracker",[],[88],["D",1775709431907],[98],[19],{"_34":35,"_13":36,"_37":38,"_39":40,"_41":42,"_43":44,"_45":46,"_47":99,"_17":49,"_50":24,"_51":52,"_53":54,"_55":-5,"_75":100,"_18":101},["D",1775755822888],[],[19,36],"2b5f19bc-33ce-11f1-96e9-42b51c65c3df","database","830171b4-dc9b-4408-ac45-48e63c9edaff",5,["D",1775709600896],[109,110],[103],{"_34":121,"_13":122,"_37":123,"_39":104,"_41":42,"_43":105,"_45":46,"_47":124,"_17":60,"_50":117,"_51":125,"_53":54,"_55":-5,"_75":126,"_18":127},{"_34":111,"_13":112,"_37":113,"_39":104,"_41":42,"_43":114,"_45":46,"_47":115,"_17":116,"_50":117,"_51":118,"_53":54,"_55":-5,"_75":119,"_18":120},"85b4e1c6-3428-11f1-baa5-42b51c65c3df","queries.ts","366e7a14-33ce-11f1-8aa1-42b51c65c3df",13,["D",1775748407159],4,"script","import { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\nimport { email } from \"https://esm.town/v/std/email\";\n\nexport interface Endpoint {\n id: number;\n name: string;\n url: string;\n alert_email: string | null;\n created_at: string;\n}\n\nexport interface Check {\n id: number;\n endpoint_id: number;\n status: number;\n response_time_ms: number;\n is_valid_json: number;\n response_body: string | null;\n changed: number;\n error: string | null;\n checked_at: string;\n}\n\nexport async function getAllEndpoints(): Promise {\n const res = await sqlite.execute(`SELECT * FROM endpoints ORDER BY created_at DESC`);\n return res.rows as unknown as Endpoint[];\n}\n\nexport async function getEndpointById(id: number): Promise {\n const res = await sqlite.execute({ sql: `SELECT * FROM endpoints WHERE id = ?`, args: [id] });\n return (res.rows as unknown as Endpoint[])[0] ?? null;\n}\n\nexport async function getLatestCheck(endpointId: number): Promise {\n const res = await sqlite.execute({\n sql: `SELECT * FROM checks WHERE endpoint_id = ? ORDER BY checked_at DESC LIMIT 1`,\n args: [endpointId],\n });\n return (res.rows as unknown as Check[])[0] ?? null;\n}\n\nexport async function getCheckHistory(endpointId: number, limit = 20): Promise {\n const res = await sqlite.execute({\n sql: `SELECT * FROM checks WHERE endpoint_id = ? ORDER BY checked_at DESC LIMIT ?`,\n args: [endpointId, limit],\n });\n return res.rows as unknown as Check[];\n}\n\nexport async function performCheck(endpoint: Endpoint): Promise {\n const start = Date.now();\n let status = 0;\n let isValidJson = false;\n let responseBody: string | null = null;\n let errorMsg: string | null = null;\n\n try {\n const res = await fetch(endpoint.url, { signal: AbortSignal.timeout(8000) });\n status = res.status;\n const elapsed = Date.now() - start;\n const text = await res.text();\n try {\n JSON.parse(text);\n isValidJson = true;\n responseBody = text;\n } catch {\n responseBody = text.slice(0, 2000); // store first 2kb even if invalid\n }\n\n // Compare with last check to detect changes\n const prev = await getLatestCheck(endpoint.id);\n const changed = prev && prev.response_body !== null && isValidJson\n ? (prev.response_body !== responseBody ? 1 : 0)\n : 0;\n\n const ins = await sqlite.execute({\n sql: `INSERT INTO checks (endpoint_id, status, response_time_ms, is_valid_json, response_body, changed, error)\n VALUES (?, ?, ?, ?, ?, ?, ?)`,\n args: [endpoint.id, status, elapsed, isValidJson ? 1 : 0, responseBody, changed, null],\n });\n\n const check: Check = {\n id: Number(ins.lastInsertRowid),\n endpoint_id: endpoint.id,\n status,\n response_time_ms: elapsed,\n is_valid_json: isValidJson ? 1 : 0,\n response_body: responseBody,\n changed,\n error: null,\n checked_at: new Date().toISOString(),\n };\n\n // Send alert if changed and alert_email configured\n if (changed && endpoint.alert_email) {\n await sendChangeAlert(endpoint, check, prev!);\n }\n\n return check;\n } catch (e: any) {\n errorMsg = e.message;\n const elapsed = Date.now() - start;\n const ins = await sqlite.execute({\n sql: `INSERT INTO checks (endpoint_id, status, response_time_ms, is_valid_json, response_body, changed, error)\n VALUES (?, ?, ?, ?, ?, ?, ?)`,\n args: [endpoint.id, 0, elapsed, 0, null, 0, errorMsg],\n });\n\n const prev = await getLatestCheck(endpoint.id);\n const wasUp = prev && !prev.error;\n if (wasUp && endpoint.alert_email) {\n await sendDownAlert(endpoint, errorMsg);\n }\n\n return {\n id: Number(ins.lastInsertRowid),\n endpoint_id: endpoint.id,\n status: 0,\n response_time_ms: elapsed,\n is_valid_json: 0,\n response_body: null,\n changed: 0,\n error: errorMsg,\n checked_at: new Date().toISOString(),\n };\n }\n}\n\nasync function sendChangeAlert(endpoint: Endpoint, check: Check, prev: Check) {\n const prevParsed = tryParse(prev.response_body);\n const newParsed = tryParse(check.response_body);\n await email({\n to: endpoint.alert_email!,\n subject: `[JSON Tracker] Change detected: ${endpoint.name}`,\n text: [\n `A change was detected in the JSON response for: ${endpoint.name}`,\n `URL: ${endpoint.url}`,\n `Checked at: ${check.checked_at}`,\n ``,\n `--- Previous response ---`,\n JSON.stringify(prevParsed, null, 2),\n ``,\n `--- New response ---`,\n JSON.stringify(newParsed, null, 2),\n ].join(\"\\n\"),\n });\n}\n\nasync function sendDownAlert(endpoint: Endpoint, error: string) {\n await email({\n to: endpoint.alert_email!,\n subject: `[JSON Tracker] Endpoint down: ${endpoint.name}`,\n text: [\n `Endpoint is unreachable: ${endpoint.name}`,\n `URL: ${endpoint.url}`,\n `Error: ${error}`,\n `Time: ${new Date().toISOString()}`,\n ].join(\"\\n\"),\n });\n}\n\nfunction tryParse(body: string | null | undefined) {\n if (!body) return null;\n try { return JSON.parse(body); } catch { return body; }\n}\n",[],[103,112],"2b5ef374-33ce-11f1-96e9-42b51c65c3df","migrations.ts","2b5ef41e-33ce-11f1-96e9-42b51c65c3df",["D",1775709600896],"import { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\n\nexport async function runMigrations() {\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS endpoints (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n name TEXT NOT NULL,\n url TEXT NOT NULL,\n alert_email TEXT,\n created_at TEXT DEFAULT (datetime('now'))\n )\n `);\n\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS checks (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n endpoint_id INTEGER,\n status INTEGER,\n response_time_ms INTEGER,\n is_valid_json INTEGER,\n response_body TEXT,\n changed INTEGER DEFAULT 0,\n error TEXT,\n checked_at TEXT DEFAULT (datetime('now'))\n )\n `);\n\n // Migrate existing endpoints table: add alert_email if missing\n try {\n await sqlite.execute(`ALTER TABLE endpoints ADD COLUMN alert_email TEXT`);\n } catch { /* column already exists */ }\n\n // Migrate existing checks table: add response_body if missing\n try {\n await sqlite.execute(`ALTER TABLE checks ADD COLUMN response_body TEXT`);\n } catch { /* column already exists */ }\n\n // Migrate existing checks table: add changed if missing\n try {\n await sqlite.execute(`ALTER TABLE checks ADD COLUMN changed INTEGER DEFAULT 0`);\n } catch { /* column already exists */ 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