Generate upload signature (video tutorial)

Overview

When using the Cloudinary SDKs for any upload or admin method that requires a signature, the signature is automatically generated and added to the request. If, however, you are making direct calls to the REST API, you need to generate a signature yourself. You can do this using a Cloudinary server-side SDK signature generation method. Watch this tutorial to learn how.

Video tutorial


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Tutorial contents

This tutorial presents the following topics. Click a timestamp to jump to that part of the video.

Import dependencies for using the Cloudinary Node.js SDK

Jump to this spot in the video  0:09 Get the dependencies to use the Cloudinary Node.js SDK and configure the environment:
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const cloudinary = require('cloudinary').v2;
require('dotenv').config();

Calculate a timestamp

Jump to this spot in the video  0:14 A timestamp is needed to generate the signature, as signatures are valid for one hour. Calculate a timestamp for the current time in seconds:
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var timestamp = Math.round((new Date).getTime()/1000);

Call the sign request method

Jump to this spot in the video  0:19 Call the api_sign_request method to generate the signature. The method requires the parameters to sign, and the API secret:
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var signature = cloudinary.utils.api_sign_request({
    timestamp: timestamp,
    eager: 'w_400,h_300,c_pad|w_260,h_200,c_crop',
    public_id: 'sample_image'}, process.env.API_SECRET);

Build a cURL command

Jump to this spot in the video  0:40 Having generated a timestamp and signature for the API call, build a cURL command to call the upload API directly.
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var file='https://upload.wikimedia.org/wikipedia/commons/b/b1/VAN_CAT.png';

var curl_command = 'curl -d "file=' + file + 
   '&api_key=323127161127519&eager=w_400,h_300,c_pad|w_260,h_200,c_crop&public_id=sample_image' + 
   '&timestamp=' + timestamp +
   '&signature=' + signature +
   '" -X POST http://api.cloudinary.com/v1_1/carl/image/upload';

Run the code to output the cURL command

Jump to this spot in the video  0:47 Running the code produces a cURL command that can then be used to perform the signed upload by directly calling the upload API.

Enter the cURL command to perform the signed upload

Jump to this spot in the video  1:05 Run the cURL command from the terminal. The returned API response shows a successful signed upload. In reality, the signature generation code would be in a function on your server, into which you would pass the parameters to sign. The function would return the signature and timestamp back to your client where they would be used in a POST request to Cloudinary.

Keep learning

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