├── .editorconfig ├── .gitignore ├── LICENSE ├── README.md ├── async-context.js ├── db.js ├── logger.js ├── package-lock.json ├── package.json ├── server.js └── users.json /.editorconfig: -------------------------------------------------------------------------------- 1 | # EditorConfig is awesome: https://EditorConfig.org 2 | 3 | # top-most EditorConfig file 4 | root = true 5 | 6 | [*] 7 | indent_style = space 8 | indent_size = 2 9 | end_of_line = lf 10 | charset = utf-8 11 | trim_trailing_whitespace = true 12 | insert_final_newline = true 13 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2021 Maxim Orlov 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Contextual Logging in Node.js 2 | 3 | For a detailed explanation of the concepts used in this repository, read the accompanying article: [Logging with Pino and AsyncLocalStorage in Node.js](https://maximorlov.com/logging-with-pino-and-asynclocalstorage-in-nodejs/). 4 | 5 | An example Node.js (Express) application that implements contextual logging by attaching a request ID to every log line. It uses [AsyncLocalStorage](https://nodejs.org/api/async_hooks.html#async_hooks_class_asynclocalstorage) together with [Pino](https://github.com/pinojs/pino). 6 | 7 | ## Getting started 8 | 9 | 1. Clone this repository: 10 | ```bash 11 | git clone git@github.com:Maximization/contextual-logging-nodejs.git && cd contextual-logging-nodejs 12 | ``` 13 | 14 | 2. Install NPM dependencies: 15 | ```bash 16 | npm install 17 | ``` 18 | 19 | 3. Start the Node.js application: 20 | ```bash 21 | npm start 22 | ``` 23 | 24 | 4. Visit `http://localhost:3000/users/1` in your browser and hit refresh a few times. 25 | 5. View the logs in your terminal. Each log line will have a unique request ID present. 26 | ```shell 27 | {...,"requestId":"da672623-818b-4b18-89ca-7eb073accbfe","userId":1,"msg":"Fetching user from DB"} 28 | {...,"requestId":"da672623-818b-4b18-89ca-7eb073accbfe","user":{...},"msg":"User found, sending to client"} 29 | {...,"requestId":"01107c17-d3c8-4e20-b1ed-165e279a9f75","userId":1,"msg":"Fetching user from DB"} 30 | {...,"requestId":"01107c17-d3c8-4e20-b1ed-165e279a9f75","user":{...},"msg":"User found, sending to client"} 31 | ``` 32 | -------------------------------------------------------------------------------- /async-context.js: -------------------------------------------------------------------------------- 1 | const { AsyncLocalStorage } = require('async_hooks'); 2 | 3 | const context = new AsyncLocalStorage(); 4 | 5 | module.exports = context; 6 | -------------------------------------------------------------------------------- /db.js: -------------------------------------------------------------------------------- 1 | const users = require('./users.json'); 2 | 3 | module.exports.getUser = async ({ userId }) => { 4 | const user = users.find((user) => user.id === userId); 5 | return user; 6 | } 7 | -------------------------------------------------------------------------------- /logger.js: -------------------------------------------------------------------------------- 1 | const pino = require('pino'); 2 | const uuid = require('uuid'); 3 | const context = require('./async-context.js'); 4 | 5 | // Create a logging instance 6 | const logger = pino({ 7 | level: process.env.NODE_ENV === 'production' ? 'info' : 'debug', 8 | }); 9 | 10 | // Proxify logger instance to use child logger from context if it exists 11 | module.exports.logger = new Proxy(logger, { 12 | get(target, property, receiver) { 13 | target = context.getStore()?.get('logger') || target; 14 | return Reflect.get(target, property, receiver); 15 | }, 16 | }); 17 | 18 | // Generate a unique ID for each incoming request and store a child logger in context 19 | // to always log the request ID 20 | module.exports.contextMiddleware = (req, res, next) => { 21 | const child = logger.child({ requestId: uuid.v4() }); 22 | const store = new Map(); 23 | store.set('logger', child); 24 | 25 | return context.run(store, next); 26 | }; 27 | -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "asynclocalstorage-with-pino", 3 | "version": "1.0.0", 4 | "lockfileVersion": 2, 5 | "requires": true, 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"contextual-logging-nodejs", 3 | "version": "1.0.0", 4 | "description": "Contextual logging in Node.js with Pino and AsyncLocalStorage", 5 | "main": "server.js", 6 | "scripts": { 7 | "test": "echo \"Error: no test specified\" && exit 1", 8 | "start": "node server.js" 9 | }, 10 | "author": "Maxim Orlov (https://github.com/Maximization)", 11 | "license": "MIT", 12 | "dependencies": { 13 | "express": "^4.17.1", 14 | "pino": "^6.10.0", 15 | "uuid": "^8.3.2" 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /server.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const { logger, contextMiddleware } = require('./logger.js'); 3 | const db = require('./db.js'); 4 | 5 | const PORT = process.env.PORT || 3000; 6 | 7 | const app = express(); 8 | 9 | // Attach a unique request ID to every log line 10 | app.use(contextMiddleware); 11 | 12 | app.get('/users/:id', async (req, res) => { 13 | let userId = req.params.id; 14 | 15 | if (isNaN(userId)) { 16 | logger.warn({ userId }, 'Invalid user ID'); 17 | return res.status(400).send('Invalid user ID'); 18 | } else { 19 | userId = Number(userId); 20 | } 21 | 22 | try { 23 | logger.info({ userId }, 'Fetching user from DB'); 24 | const user = await db.getUser({ userId }); 25 | 26 | if (!user) { 27 | logger.warn({ userId }, 'User not found'); 28 | return res.status(404).send('User not found'); 29 | } 30 | 31 | logger.debug({ user }, 'User found, sending to client'); 32 | return res.status(200).json(user); 33 | } catch (error) { 34 | logger.error(error, 'Failed to fetch user from DB'); 35 | return res.status(500).send('An error occurred while fetching user'); 36 | } 37 | }); 38 | 39 | app.listen(PORT, () => { 40 | logger.info(`Server listening at http://localhost:${PORT}`); 41 | }); 42 | -------------------------------------------------------------------------------- /users.json: -------------------------------------------------------------------------------- 1 | [ 2 | { 3 | "id": 1, 4 | "name": "Leanne Graham", 5 | "username": "Bret", 6 | "email": "Sincere@april.biz", 7 | "address": { 8 | "street": "Kulas Light", 9 | "suite": "Apt. 556", 10 | "city": "Gwenborough", 11 | "zipcode": "92998-3874", 12 | "geo": { 13 | "lat": "-37.3159", 14 | "lng": "81.1496" 15 | } 16 | }, 17 | "phone": "1-770-736-8031 x56442", 18 | "website": "hildegard.org", 19 | "company": { 20 | "name": "Romaguera-Crona", 21 | "catchPhrase": "Multi-layered client-server neural-net", 22 | "bs": "harness real-time e-markets" 23 | } 24 | }, 25 | { 26 | "id": 2, 27 | "name": "Ervin Howell", 28 | "username": "Antonette", 29 | "email": "Shanna@melissa.tv", 30 | "address": { 31 | "street": "Victor Plains", 32 | "suite": "Suite 879", 33 | "city": "Wisokyburgh", 34 | "zipcode": "90566-7771", 35 | "geo": { 36 | "lat": "-43.9509", 37 | "lng": "-34.4618" 38 | } 39 | }, 40 | "phone": "010-692-6593 x09125", 41 | "website": "anastasia.net", 42 | "company": { 43 | "name": "Deckow-Crist", 44 | "catchPhrase": "Proactive didactic contingency", 45 | "bs": "synergize scalable supply-chains" 46 | } 47 | }, 48 | { 49 | "id": 3, 50 | "name": "Clementine Bauch", 51 | "username": "Samantha", 52 | "email": "Nathan@yesenia.net", 53 | "address": { 54 | "street": "Douglas Extension", 55 | "suite": "Suite 847", 56 | "city": "McKenziehaven", 57 | "zipcode": "59590-4157", 58 | "geo": { 59 | "lat": "-68.6102", 60 | "lng": "-47.0653" 61 | } 62 | }, 63 | "phone": "1-463-123-4447", 64 | "website": "ramiro.info", 65 | "company": { 66 | "name": "Romaguera-Jacobson", 67 | "catchPhrase": "Face to face bifurcated interface", 68 | "bs": "e-enable strategic applications" 69 | } 70 | }, 71 | { 72 | "id": 4, 73 | "name": "Patricia Lebsack", 74 | "username": "Karianne", 75 | "email": "Julianne.OConner@kory.org", 76 | "address": { 77 | "street": "Hoeger Mall", 78 | "suite": "Apt. 692", 79 | "city": "South Elvis", 80 | "zipcode": "53919-4257", 81 | "geo": { 82 | "lat": "29.4572", 83 | "lng": "-164.2990" 84 | } 85 | }, 86 | "phone": "493-170-9623 x156", 87 | "website": "kale.biz", 88 | "company": { 89 | "name": "Robel-Corkery", 90 | "catchPhrase": "Multi-tiered zero tolerance productivity", 91 | "bs": "transition cutting-edge web services" 92 | } 93 | }, 94 | { 95 | "id": 5, 96 | "name": "Chelsey Dietrich", 97 | "username": "Kamren", 98 | "email": "Lucio_Hettinger@annie.ca", 99 | "address": { 100 | "street": "Skiles Walks", 101 | "suite": "Suite 351", 102 | "city": "Roscoeview", 103 | "zipcode": "33263", 104 | "geo": { 105 | "lat": "-31.8129", 106 | "lng": "62.5342" 107 | } 108 | }, 109 | "phone": "(254)954-1289", 110 | "website": "demarco.info", 111 | "company": { 112 | "name": "Keebler LLC", 113 | "catchPhrase": "User-centric fault-tolerant solution", 114 | "bs": "revolutionize end-to-end systems" 115 | } 116 | }, 117 | { 118 | "id": 6, 119 | "name": "Mrs. Dennis Schulist", 120 | "username": "Leopoldo_Corkery", 121 | "email": "Karley_Dach@jasper.info", 122 | "address": { 123 | "street": "Norberto Crossing", 124 | "suite": "Apt. 950", 125 | "city": "South Christy", 126 | "zipcode": "23505-1337", 127 | "geo": { 128 | "lat": "-71.4197", 129 | "lng": "71.7478" 130 | } 131 | }, 132 | "phone": "1-477-935-8478 x6430", 133 | "website": "ola.org", 134 | "company": { 135 | "name": "Considine-Lockman", 136 | "catchPhrase": "Synchronised bottom-line interface", 137 | "bs": "e-enable innovative applications" 138 | } 139 | }, 140 | { 141 | "id": 7, 142 | "name": "Kurtis Weissnat", 143 | "username": "Elwyn.Skiles", 144 | "email": "Telly.Hoeger@billy.biz", 145 | "address": { 146 | "street": "Rex Trail", 147 | "suite": "Suite 280", 148 | "city": "Howemouth", 149 | "zipcode": "58804-1099", 150 | "geo": { 151 | "lat": "24.8918", 152 | "lng": "21.8984" 153 | } 154 | }, 155 | "phone": "210.067.6132", 156 | "website": "elvis.io", 157 | "company": { 158 | "name": "Johns Group", 159 | "catchPhrase": "Configurable multimedia task-force", 160 | "bs": "generate enterprise e-tailers" 161 | } 162 | }, 163 | { 164 | "id": 8, 165 | "name": "Nicholas Runolfsdottir V", 166 | "username": "Maxime_Nienow", 167 | "email": "Sherwood@rosamond.me", 168 | "address": { 169 | "street": "Ellsworth Summit", 170 | "suite": "Suite 729", 171 | "city": "Aliyaview", 172 | "zipcode": "45169", 173 | "geo": { 174 | "lat": "-14.3990", 175 | "lng": "-120.7677" 176 | } 177 | }, 178 | "phone": "586.493.6943 x140", 179 | "website": "jacynthe.com", 180 | "company": { 181 | "name": "Abernathy Group", 182 | "catchPhrase": "Implemented secondary concept", 183 | "bs": "e-enable extensible e-tailers" 184 | } 185 | }, 186 | { 187 | "id": 9, 188 | "name": "Glenna Reichert", 189 | "username": "Delphine", 190 | "email": "Chaim_McDermott@dana.io", 191 | "address": { 192 | "street": "Dayna Park", 193 | "suite": "Suite 449", 194 | "city": "Bartholomebury", 195 | "zipcode": "76495-3109", 196 | "geo": { 197 | "lat": "24.6463", 198 | "lng": "-168.8889" 199 | } 200 | }, 201 | "phone": "(775)976-6794 x41206", 202 | "website": "conrad.com", 203 | "company": { 204 | "name": "Yost and Sons", 205 | "catchPhrase": "Switchable contextually-based project", 206 | "bs": "aggregate real-time technologies" 207 | } 208 | }, 209 | { 210 | "id": 10, 211 | "name": "Clementina DuBuque", 212 | "username": "Moriah.Stanton", 213 | "email": "Rey.Padberg@karina.biz", 214 | "address": { 215 | "street": "Kattie Turnpike", 216 | "suite": "Suite 198", 217 | "city": "Lebsackbury", 218 | "zipcode": "31428-2261", 219 | "geo": { 220 | "lat": "-38.2386", 221 | "lng": "57.2232" 222 | } 223 | }, 224 | "phone": "024-648-3804", 225 | "website": "ambrose.net", 226 | "company": { 227 | "name": "Hoeger LLC", 228 | "catchPhrase": "Centralized empowering task-force", 229 | "bs": "target end-to-end models" 230 | } 231 | } 232 | ] --------------------------------------------------------------------------------