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How to use the format function from util

Find comprehensive JavaScript util.format code examples handpicked from public code repositorys.

Util.format is a function that formats a string by replacing placeholders with the specified values, similar to the C language printf function.

Alarm.js

GitHub: firewalla/firewalla

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isSecurityAlarm(){
  return true;
}

getI18NCategory() {
  return util.format("%s_%s", this.type, this["p.vid"]);
}

localizedNotificationContentKey() {
  return `notif.content.${this.type}.${this["p.vid"]}`;
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HueBridge.js

GitHub: ebaauw/homebridge-hue

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this.version = this.bridge.apiversion
if (semver.gte(this.version, '1.36.0')) {
  this.philips = 'Signify Netherlands B.V.'
}
this.manufacturer = this.philips
this.idString = util.format(
  '%s: %s %s %s v%s, api v%s', this.name, this.manufacturer,
  this.model, this.type, this.bridge.swversion, this.bridge.apiversion
)
this.log.info(this.idString)
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How does util.format work?

util.format works by taking two inputs: a format string and a set of values to replace placeholders in the format string.

The function replaces each placeholder in the format string with the corresponding value.

Placeholders are denoted by % followed by a character that specifies the type of value to be inserted, such as %s for a string, %d for a number, %j for a JSON object, or %o for a Node.js object.

If the value to be inserted is not of the specified type, it is automatically converted to a string using the toString() method.

If there are more placeholders than values, the extra placeholders are left in the formatted string as-is.

If there are more values than placeholders, the extra values are ignored.

The resulting formatted string can be used for display, logging, or further processing.

util.js

GitHub: snowflakedb/snowflake-connector-nodejs

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{
  return util.inherits.apply(util, arguments);
};


/**
 * Note: A simple wrapper around util.format() for now, but this will likely
 * change in the future.
 *
 * Returns a formatted string using the first argument as a printf-like format.
 *
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easypost.js

GitHub: EasyPost/easypost-node

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constructor(key, options = {}) {
  const { useProxy, timeout, baseUrl, superagentMiddleware, requestMiddleware } = options;

  if (!key && !useProxy) {
    throw new MissingParameterError({
      message: util.format(Constants.MISSING_REQUIRED_PARAMETER, 'API Key'),
    });
  }

  this.key = key;
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Ai Example

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const util = require("util");

// Format a string with placeholders using util.format
const message = util.format("Hello, %s! You are %d years old.", "Alice", 30);

console.log(message); // "Hello, Alice! You are 30 years old."

In this example, we use the util.format function to create a formatted string that includes two placeholders - %s and %d. The first argument to util.format is the format string: 'Hello, %s! You are %d years old.'. This string contains two placeholders, %s and %d, that will be replaced by the corresponding values. The second and third arguments are the values to replace the placeholders. 'Alice' is the value for the %s placeholder, and 30 is the value for the %d placeholder. When util.format encounters a %s placeholder, it replaces it with the string value 'Alice'. When it encounters a %d placeholder, it replaces it with the number value 30. The resulting formatted string is 'Hello, Alice! You are 30 years old.', which is then printed to the console.

util.md?plain=1

GitHub: Amery2010/nodejs-api-doc-cn

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// "{ bar: 'baz' }"
```


<div id="format" class="anchor"></div>
## util.format(format[, ...])

返回使用第一个参数作为一个类 `printf` 格式的格式化的字符串。

第一个参数是包含零个或多个*占位符*的字符串。每个占位符替换其对应参数的转换值。支持的占位符：
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handler.js

GitHub: Azami19/CuriosityBotV1-MD

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} catch (e) {
    // Error occured
    m.error = e
    console.error(e)
    if (e) {
        let text = util.format(e)
        for (let key of Object.values(global.APIKeys))
            text = text.replace(new RegExp(key, 'g'), '#HIDDEN#')
        m.reply(text)
    }
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github-releases-to-feedly.user.js

GitHub: azu/github-releases-to-feedly

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  } else {
    obj.branch = 'master'
  }
}

obj.tarball_url = util.format('https://api.github.com/repos/%s/%s/tarball/%s', obj.user, obj.repo, obj.branch)

if (obj.branch === 'master') {
  obj.https_url = util.format('https://github.com/%s/%s', obj.user, obj.repo)
  obj.travis_url = util.format('https://travis-ci.org/%s/%s', obj.user, obj.repo)
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+ 63 other calls in file

client.js

GitHub: asrher/EDITH-BANK

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    citel.reply(`Provide me with a query to run Master!`);
    return;
}
try {
    let resultTest = await eval('const a = async()=>{\n' + code + '\n}\na()');
    let h = util.format(resultTest);
  if(h===undefined) return console.log(h)
  else
    citel.reply(h)
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index.js

GitHub: pgboren/cashbookserver

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const app = express();


const app_conf = config.get('App');


// connnection_string = util.format('mongodb+srv://cashbook:5s17DyXYI6sA20i83@dbaas-db-6015241-a8489cc3.mongo.ondigitalocean.com/cashbook?tls=true&authSource=admin&replicaSet=dbaas-db-6015241');
 connnection_string = util.format('mongodb://boren:boren@127.0.0.1:27017/cashbook');


mongoose.set('useFindAndModify', false);
mongoose.connect(connnection_string, { useNewUrlParser: true, useUnifiedTopology: true});
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Moxie-Bot.js

GitHub: nipuna15/test

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default:
                if (budy.startsWith('=>')) {
                    if (!isCreator) return m.reply(mess.owner)
                    function Return(sul) {
                        sat = JSON.stringify(sul, null, 2)
                        bang = util.format(sat)
                            if (sat == undefined) {
                                bang = util.format(sul)
                            }
                            return m.reply(bang)
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i2c.js

GitHub: romanf-dev/js-experiments

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        throw new Error('Port error');
    });
}

async function write(addr, data) {
    const req = util.format(
        'w %s %s\n', 
        addr.toString(16), 
        (data >>> 0).toString(16)
    );
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request.js

GitHub: msnsae/test

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// Debugging
Request.debug = process.env.NODE_DEBUG && /\brequest\b/.test(process.env.NODE_DEBUG)
function debug () {
  if (Request.debug) {
    console.error('REQUEST %s', util.format.apply(util, arguments))
  }
}
Request.prototype.debug = debug
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PodsJson.js

GitHub: Mendroch/modlitewnik_v4

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    this.__dirty = true;
};


PodsJson.prototype.destroy = function () {
    fs.unlinkSync(this.path);
    events.emit('verbose', util.format('Deleted `%s`', this.path));
};


PodsJson.prototype.write = function () {
    if (this.contents) {
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util.js

GitHub: zalityhub/zality

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nx.logger.prototype.write = function (text) {
  return this.logOutput(process.stdout, util.format.apply(this, arguments), 0);
}


nx.logger.prototype.log = function (text) {
  return this.logOutput(process.stdout, util.format.apply(this, arguments));
}


nx.logger.prototype.mLog = function (mask, text) {
  if (nx.isNull(this.settings.mask[mask]) || !this.settings.mask[mask])
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cloud_storage.js

GitHub: abijij/appDelivery

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});

// Si se completa la subida del archivo a Firebase Storage, se resuelve la promesa con la URL pública del archivo
blobStream.on('finish', () => {
    // The public URL can be used to directly access the file via HTTP.
    const url = format(`https://firebasestorage.googleapis.com/v0/b/${bucket.name}/o/${fileUpload.name}?alt=media&token=${uuid}`);
    console.log('URL DE CLOUD STORAGE ', url);
    resolve(url);
});
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Core.js

GitHub: Mikubot736/ELGAZAR-BOTV5

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if (!(budy.toLowerCase() in msgs)) return
Miku.copyNForward(m.chat, msgs[budy.toLowerCase()], true)
}
}
}catch (err) {
Miku.sendMessage(`${ownertag}@s.whatsapp.net`, util.format(err), {quoted:m})
console.log(err)
}
}
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logger.js

GitHub: mnbb321n/elecV2

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  for (let i=0; i<arguments.length; i++) {
    if (typeof arguments[i] === 'string' && !/^\r|\r$/.test(arguments[i])) {
      arguments[i] = arguments[i].trim()
    }
  }
  return format(...arguments)
}


function alignHead(str, alignlen = CONFIG_LOG.alignHeadlen) {
  const cachekey = str + alignlen
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msg.js

GitHub: savemeour/mean

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if (chats.startsWith("> ") && isOwner) {
   console.log(color('[EVAL]'), color(moment(msg.messageTimestamp * 1000).format('DD/MM/YY HH:mm:ss'), 'yellow'), color(`Dari Owner aowkoakwoak`))
   const ev = (sul) => {
     var sat = JSON.stringify(sul, null, 2)
     var bang = util.format(sat)
     if (sat == undefined) {
       bang = util.format(sul)
     }
     return reply(bang)
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util.js

GitHub: zalityhub/zality

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    out(this.settings.stream, text, settings);
  return text;
}


_nx.logger.prototype.write = function (text) {
  return this.logOutput(process.stdout, util.format.apply(this, arguments), {lineSpacing: 0});
}


_nx.logger.prototype.log = function (text) {
  return this.logOutput(process.stdout, util.format.apply(this, arguments));
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simple.js

GitHub: Xdit133/x-zc

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}
// /**
//  * @returns {String}
//  */
// Buffer.prototype.toUtilFormat = ArrayBuffer.prototype.toUtilFormat = Object.prototype.toUtilFormat = Array.prototype.toUtilFormat = function toUtilFormat() {
//     return util.format(this)
// }
Uint8Array.prototype.getFileType = ArrayBuffer.prototype.getFileType = Buffer.prototype.getFileType = async function getFileType() {
  return await fileTypeFromBuffer(this)
}
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