curl --request POST \
--url https://api.example.com/v2/media/uploads/sign \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"purpose": "signature"
}
'import requests
url = "https://api.example.com/v2/media/uploads/sign"
payload = { "purpose": "signature" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({purpose: 'signature'})
};
fetch('https://api.example.com/v2/media/uploads/sign', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.example.com/v2/media/uploads/sign",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'purpose' => 'signature'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.example.com/v2/media/uploads/sign"
payload := strings.NewReader("{\n \"purpose\": \"signature\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.example.com/v2/media/uploads/sign")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"purpose\": \"signature\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.example.com/v2/media/uploads/sign")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"purpose\": \"signature\"\n}"
response = http.request(request)
puts response.read_body{
"upload_url": "<string>",
"fields": {
"api_key": "<string>",
"timestamp": 123,
"signature": "<string>",
"asset_folder": "<string>",
"allowed_formats": "<string>"
}
}{
"type": "request-validation",
"status": 422,
"title": "<string>",
"errors": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>"
}
],
"detail": "<string>"
}Sign a Media Upload
Mints a short-lived signature for a direct browser-to-Cloudinary upload.
The browser POSTs the file plus every returned field to upload_url and
reads secure_url from Cloudinary’s response. The API secret never
leaves the backend; only the upload is signed (delivery stays public).
curl --request POST \
--url https://api.example.com/v2/media/uploads/sign \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"purpose": "signature"
}
'import requests
url = "https://api.example.com/v2/media/uploads/sign"
payload = { "purpose": "signature" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({purpose: 'signature'})
};
fetch('https://api.example.com/v2/media/uploads/sign', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.example.com/v2/media/uploads/sign",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'purpose' => 'signature'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.example.com/v2/media/uploads/sign"
payload := strings.NewReader("{\n \"purpose\": \"signature\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.example.com/v2/media/uploads/sign")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"purpose\": \"signature\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.example.com/v2/media/uploads/sign")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"purpose\": \"signature\"\n}"
response = http.request(request)
puts response.read_body{
"upload_url": "<string>",
"fields": {
"api_key": "<string>",
"timestamp": 123,
"signature": "<string>",
"asset_folder": "<string>",
"allowed_formats": "<string>"
}
}{
"type": "request-validation",
"status": 422,
"title": "<string>",
"errors": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>"
}
],
"detail": "<string>"
}Authorizations
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Body
Request a signed upload for a given media purpose.
What the upload is for; scopes the folder and limits.
"signature"Response
Successful Response
Provider-neutral signed-upload envelope.
Same shape as an S3 presigned POST, so storage can be swapped later with
no frontend/SDK change: the client POSTs file + every key in
fields to upload_url and reads secure_url from the response.
Endpoint the browser POSTs the file + fields to.
Form fields the browser must POST verbatim alongside the file.
Cloudinary recomputes the signature from these params and rejects on any mismatch, so the client sends them byte-for-byte as returned here. Every signed param is included — omitting one would break signature validation.
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