javascript - Download base64 encoded file - Stack Overflow

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In React, I uploaded a file using:

        let reader = new FileReader();
        reader.readAsDataURL(file); 
        reader.onloadend = function() {
            let base64data = reader.result;    
            uploadFile(base64data);
            return;
        }

This gives me a Base64 encoded text data:application/octet-stream;base64,JVBERi0xLj... This is fine as when I decode 'JVBERi0xLj...' I get the correct text in case of a text file.

When a download request is made to the server I get the same data back but I'm having a difficulty downloading the file. I receive the same base64 encoded string in the response from the server but unable to open the downloaded file.

I have done the following:

                const blob = new Blob([fetchData], { type: 'application/pdf' })
                let url = window.URL.createObjectURL(blob);
                let a = document.createElement('a');
                a.href = blob;
                a.download = 'doc.pdf';
                a.click();

Any ideas?

Note: The upload file is converted to base64 to avoid any http munication issues.

Solution following your suggestions:

                let fetchDataModified = `data:application/pdf;base64,${fetchData }`;
                let a = document.createElement("a");
                a.href = fetchData;
                a.download = 'doc.pdf';
                a.click();

When converting to Base64 during upload the data type was set to 'application/octet-stream'. However, when downloading I changed that to 'application/pdf' following Vaibhav's suggestion and used createElement instead of createObjectURL and it worked. Thank you

In React, I uploaded a file using:

        let reader = new FileReader();
        reader.readAsDataURL(file); 
        reader.onloadend = function() {
            let base64data = reader.result;    
            uploadFile(base64data);
            return;
        }

This gives me a Base64 encoded text data:application/octet-stream;base64,JVBERi0xLj... This is fine as when I decode 'JVBERi0xLj...' I get the correct text in case of a text file.

When a download request is made to the server I get the same data back but I'm having a difficulty downloading the file. I receive the same base64 encoded string in the response from the server but unable to open the downloaded file.

I have done the following:

                const blob = new Blob([fetchData], { type: 'application/pdf' })
                let url = window.URL.createObjectURL(blob);
                let a = document.createElement('a');
                a.href = blob;
                a.download = 'doc.pdf';
                a.click();

Any ideas?

Note: The upload file is converted to base64 to avoid any http munication issues.

Solution following your suggestions:

                let fetchDataModified = `data:application/pdf;base64,${fetchData }`;
                let a = document.createElement("a");
                a.href = fetchData;
                a.download = 'doc.pdf';
                a.click();

When converting to Base64 during upload the data type was set to 'application/octet-stream'. However, when downloading I changed that to 'application/pdf' following Vaibhav's suggestion and used createElement instead of createObjectURL and it worked. Thank you

• javascript
• reactjs

Share Improve this question Follow edited Jan 20, 2021 at 4:47 cleatedheels asked Jan 20, 2021 at 4:08 cleatedheelscleatedheels 6711 gold badge11 silver badge77 bronze badges 3

• 1 I'm not familiar with react but i'm hoping this answer can help with your issue. please check. stackoverflow./questions/44656610/… – Kakashi Hatake Commented Jan 20, 2021 at 4:20
• Try giving a.href = url instead of a.href = blob – Ajmal Noushad Commented Jan 20, 2021 at 4:21
• 1 probably, here is the answer: stackoverflow./questions/21729451/… – Cuong DaoVan Commented Jan 20, 2021 at 4:40

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 2

“data:application/pdf” + the base64 string that you saved into our database

In React, I uploaded a file using:

        let reader = new FileReader();
        reader.readAsDataURL(file); 
        reader.onloadend = function() {
            let base64data = reader.result;    
            uploadFile(base64data);
            return;
        }

This gives me a Base64 encoded text data:application/octet-stream;base64,JVBERi0xLj... This is fine as when I decode 'JVBERi0xLj...' I get the correct text in case of a text file.

When a download request is made to the server I get the same data back but I'm having a difficulty downloading the file. I receive the same base64 encoded string in the response from the server but unable to open the downloaded file.

I have done the following:

                const blob = new Blob([fetchData], { type: 'application/pdf' })
                let url = window.URL.createObjectURL(blob);
                let a = document.createElement('a');
                a.href = blob;
                a.download = 'doc.pdf';
                a.click();

Any ideas?

Note: The upload file is converted to base64 to avoid any http munication issues.

Solution following your suggestions:

                let fetchDataModified = `data:application/pdf;base64,${fetchData }`;
                let a = document.createElement("a");
                a.href = fetchData;
                a.download = 'doc.pdf';
                a.click();

When converting to Base64 during upload the data type was set to 'application/octet-stream'. However, when downloading I changed that to 'application/pdf' following Vaibhav's suggestion and used createElement instead of createObjectURL and it worked. Thank you

In React, I uploaded a file using:

        let reader = new FileReader();
        reader.readAsDataURL(file); 
        reader.onloadend = function() {
            let base64data = reader.result;    
            uploadFile(base64data);
            return;
        }

This gives me a Base64 encoded text data:application/octet-stream;base64,JVBERi0xLj... This is fine as when I decode 'JVBERi0xLj...' I get the correct text in case of a text file.

When a download request is made to the server I get the same data back but I'm having a difficulty downloading the file. I receive the same base64 encoded string in the response from the server but unable to open the downloaded file.

I have done the following:

                const blob = new Blob([fetchData], { type: 'application/pdf' })
                let url = window.URL.createObjectURL(blob);
                let a = document.createElement('a');
                a.href = blob;
                a.download = 'doc.pdf';
                a.click();

Any ideas?

Note: The upload file is converted to base64 to avoid any http munication issues.

Solution following your suggestions:

                let fetchDataModified = `data:application/pdf;base64,${fetchData }`;
                let a = document.createElement("a");
                a.href = fetchData;
                a.download = 'doc.pdf';
                a.click();

When converting to Base64 during upload the data type was set to 'application/octet-stream'. However, when downloading I changed that to 'application/pdf' following Vaibhav's suggestion and used createElement instead of createObjectURL and it worked. Thank you

• javascript
• reactjs

Share Improve this question Follow edited Jan 20, 2021 at 4:47 cleatedheels asked Jan 20, 2021 at 4:08 cleatedheelscleatedheels 6711 gold badge11 silver badge77 bronze badges 3

• 1 I'm not familiar with react but i'm hoping this answer can help with your issue. please check. stackoverflow./questions/44656610/… – Kakashi Hatake Commented Jan 20, 2021 at 4:20
• Try giving a.href = url instead of a.href = blob – Ajmal Noushad Commented Jan 20, 2021 at 4:21
• 1 probably, here is the answer: stackoverflow./questions/21729451/… – Cuong DaoVan Commented Jan 20, 2021 at 4:40

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 2

“data:application/pdf” + the base64 string that you saved into our database

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