CODEWITHSUNDEEP
node.jsexpress
iamredpanda
iamredpanda

Reputation: 103

UnhandledPromiseRejectionWarning: TypeError: _base64Stream2.default.encode is not a function

I am trying to make this simple api with the help of this article .The primary purpose of reading this article is to learn react native but it starts with a server in nodejs .I couldn't get it running correctly . Here is the link to article link

Here is the code for server.js file

import express from 'express';
import http from 'http';
import giphyapi from 'giphy-api';
import base64 from 'base64-stream';
// Initialize http server
const app = express();

// Register /gif endpoint that returns base64 encoded gif
app.get('/gif', async (req, res) => {
  res.json({
    gif: await fetchGif(),
  });
});

// Launch the server on port 3000
const server = app.listen(3000, () => {
  const { address, port } = server.address();
  console.log(`Listening at http://${address}:${port}`);
});
// Fetch random GIF url with Giphy API, download and Base64 encode it
export const fetchGif = async () => {
    const item = await giphyapi().random('cat');
    return await encode(await download(item.data.image_url));
  };

  // File download helper
const download = async (url) => {
    return new Promise((resolve, reject) => {
      let req = http.get(url.replace('https', 'http'));
      req.on('response', res => {
        resolve(res);
      });
      req.on('error', err => {
        reject(err);
      });
    });
  };
  // Base64 encode helper
const encode = async (content) => {
    let output = 'data:image/gif;base64,';
    const stream = content.pipe(base64.encode());
    return new Promise((resolve, reject) => {
      stream.on('readable', () => {
        let read = stream.read();
        if (read) {
          output += read.toString();
        }
        else {
          resolve(output);
        }
      });
      stream.on('error', (err) => {
        reject(err);
      });
    });
  };

Upvotes: 1

Views: 800

Answers (2)

Aritra Chakraborty
Aritra Chakraborty

Reputation: 12552

base64-stream doesn't have any function called encode(..).

There are two Classes Base64Encode, Base64Decode which are used to stream.

Upvotes: 0

Jose Noriega
Jose Noriega

Reputation: 245

the error is occurring because the third-party library "base64-stream" does not have the "encoded" function, it may exist in previous versions.

To solve this problem, you need to change some lines of your code so that your server looks like the code below.

const express = require('express'); // instead of "import express from 'express';"
const http = require('http'); // instead of "import http from 'http';"
const giphyapi = require('giphy-api'); // instead of "import http from 'http';"
const { Base64Encode } = require('base64-stream'); // instead of "import base64 from 'base64-stream';"
// Initialize http server
const app = express();

// Register /gif endpoint that returns base64 encoded gif
app.get('/gif', async (req, res) => {
  try {
    const gif = await fetchGif();
    res.json({ gif });
  } catch (error) {
    res.status(500).send({ error });
  }
});

// Base64 encode helper
const encode = (content) => {
  let output = 'data:image/gif;base64,';
  const stream = content.pipe(new Base64Encode()); // instead of "const stream = content.pipe(base64.encode());"
  return new Promise((resolve, reject) => {
    stream.on('readable', () => {
      let read = stream.read();
      if (read) {
        output += read.toString();
      }
      else {
        resolve(output);
      }
    });
    stream.on('error', (err) => {
      reject(err);
    });
  });
};

// Launch the server on port 3000
const server = app.listen(3000, () => {
  const { address, port } = server.address();
  console.log(`Listening at http://${address}:${port}`);
});

// Fetch random GIF url with Giphy API, download and Base64 encode it
const fetchGif = async () => {
  try {
    const item = await giphyapi().random('cat');
    const image = await download(item.data.image_url);
    return await encode(image);
  } catch (error) {
    console.log('fetchGif', error);
  }
};

// File download helper
const download = (url) => {
  return new Promise((resolve, reject) => {
    let req = http.get(url.replace('https', 'http'));
    req.on('response', res => {
      resolve(res);
    });
    req.on('error', err => {
      reject(err);
    });
  });
};

Upvotes: 1

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