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- arlisk95
-
Scratcher
1 post
Leopard: Edit Scratch projects as JavaScript code
Put in my project https://scratch.mit.edu/projects/919450646/ but it says that there is “undefined values”, that it only supports 3.0 projects, and that it only supports pen plug in, which those last two my project complies with, i dont know what undefined values are and how to fix them, could anyone help?
- Super_Stinky_Odyssey
-
Scratcher
21 posts
Leopard: Edit Scratch projects as JavaScript code
Put in my project https://scratch.mit.edu/projects/919450646/ but it says that there is “undefined values”, that it only supports 3.0 projects, and that it only supports pen plug in, which those last two my project complies with, i dont know what undefined values are and how to fix them, could anyone help?I feel like it's just broken now

- Super_Stinky_Odyssey
-
Scratcher
21 posts
Leopard: Edit Scratch projects as JavaScript code
I knowI know you know
- void9909
-
Scratcher
4 posts
Leopard: Edit Scratch projects as JavaScript code
Please use this thread to discuss Leopard, share your projects, and ask for help.
That's right! Translating Scratch to JavaScript is now possible! The tool is called Leopard, and it's available here:
Leopard Website – Go here to convert your projects!
Who needs this?
If you know Scratch and want to learn JavaScript, Leopard is made for you. It's the perfect transition tool. Leopard also allows you to convert your existing Scratch projects into JavaScript code and edit them that way.
What if it doesn't work?
Not every project will translate perfectly. That's why we have a team of Leopard Mentors who are here to offer support. If you are having trouble with a project, you can ask here on the forums or create a dedicated “cleanup crew” post to get more 1-on-1 help.Thank you so much to the contributors who made Leopard possible!
I put one of my projects and a problem repeatedly occurred twice
- Super_Stinky_Odyssey
-
Scratcher
21 posts
Leopard: Edit Scratch projects as JavaScript code
It doesn't work anymorePlease use this thread to discuss Leopard, share your projects, and ask for help.
That's right! Translating Scratch to JavaScript is now possible! The tool is called Leopard, and it's available here:
Leopard Website – Go here to convert your projects!
Who needs this?
If you know Scratch and want to learn JavaScript, Leopard is made for you. It's the perfect transition tool. Leopard also allows you to convert your existing Scratch projects into JavaScript code and edit them that way.
What if it doesn't work?
Not every project will translate perfectly. That's why we have a team of Leopard Mentors who are here to offer support. If you are having trouble with a project, you can ask here on the forums or create a dedicated “cleanup crew” post to get more 1-on-1 help.Thank you so much to the contributors who made Leopard possible!
I put one of my projects and a problem repeatedly occurred twice
- _-_-F4F_-_-
-
Scratcher
16 posts
Leopard: Edit Scratch projects as JavaScript code
Please use this thread to discuss Leopard, share your projects, and ask for help.
That's right! Translating Scratch to JavaScript is now possible! The tool is called Leopard, and it's available here:
Leopard Website – Go here to convert your projects!
Who needs this?
If you know Scratch and want to learn JavaScript, Leopard is made for you. It's the perfect transition tool. Leopard also allows you to convert your existing Scratch projects into JavaScript code and edit them that way.
What if it doesn't work?
Not every project will translate perfectly. That's why we have a team of Leopard Mentors who are here to offer support. If you are having trouble with a project, you can ask here on the forums or create a dedicated “cleanup crew” post to get more 1-on-1 help.Thank you so much to the contributors who made Leopard possible!
Hi there, I've been using leopard for well over a year now. and I desperately want a feature:
the ability to convert JavaScript back into block-based code, such as Scratch blocks
That would be seriously amazing…
Please update me, thanks!
- void9909
-
Scratcher
4 posts
Leopard: Edit Scratch projects as JavaScript code
leopard is not workingCool!Let me know if you run into any issues!I'll try it out!
- _-_-F4F_-_-
-
Scratcher
16 posts
Leopard: Edit Scratch projects as JavaScript code
leopard is not workingCool!Let me know if you run into any issues!I'll try it out!
really? Leopard works for me just fine
- Drag00nKnight_999
-
Scratcher
21 posts
Leopard: Edit Scratch projects as JavaScript code
Imma test something. If it works without lists than I think I figured it out.leopard is not workingCool!Let me know if you run into any issues!I'll try it out!
really? Leopard works for me just fine
- TheGuys4554
-
Scratcher
53 posts
Leopard: Edit Scratch projects as JavaScript code
I tried converting https://scratch.mit.edu/projects/1243055522 for a big Collab called EmberLight, however It is saying “ undefined ” is not readable
- void9909
-
Scratcher
4 posts
Leopard: Edit Scratch projects as JavaScript code
it crashed 7 timesleopard is not workingCool!Let me know if you run into any issues!I'll try it out!
really? Leopard works for me just fine
when green flag clicked
crash (7) times
Last edited by void9909 (Nov. 20, 2025 23:46:40)
- PullJosh
-
Scratcher
1000+ posts
Leopard: Edit Scratch projects as JavaScript code
Hey everyone!
The funding I had available to host the project editor directly on the Leopard website ran out. That means it's time to go back to editing within CodeSandbox or just downloading projects as a zip. The “Leopard Editor” option is being removed.
If you have projects saved on the website, you have a little over a month to download them, copy them, whatever you want to do, before the content on the website will be removed.
BXCoding have been wonderful partners supporting the Leopard website infrastructure at no cost to me during this period of a couple years. If you like Leopard, you should definitely also check out their project Patch which is like Scratch but in Python.
The funding I had available to host the project editor directly on the Leopard website ran out. That means it's time to go back to editing within CodeSandbox or just downloading projects as a zip. The “Leopard Editor” option is being removed.
If you have projects saved on the website, you have a little over a month to download them, copy them, whatever you want to do, before the content on the website will be removed.
BXCoding have been wonderful partners supporting the Leopard website infrastructure at no cost to me during this period of a couple years. If you like Leopard, you should definitely also check out their project Patch which is like Scratch but in Python.
- Super_Stinky_Odyssey
-
Scratcher
21 posts
Leopard: Edit Scratch projects as JavaScript code
Hey everyone!NNOOO
The funding I had available to host the project editor directly on the Leopard website ran out. That means it's time to go back to editing within CodeSandbox or just downloading projects as a zip. The “Leopard Editor” option is being removed.
If you have projects saved on the website, you have a little over a month to download them, copy them, whatever you want to do, before the content on the website will be removed.
BXCoding have been wonderful partners supporting the Leopard website infrastructure at no cost to me during this period of a couple years. If you like Leopard, you should definitely also check out their project Patch which is like Scratch but in Python.
- hansipansi24
-
Scratcher
26 posts
Leopard: Edit Scratch projects as JavaScript code
Hey everyone!nice
The funding I had available to host the project editor directly on the Leopard website ran out. That means it's time to go back to editing within CodeSandbox or just downloading projects as a zip. The “Leopard Editor” option is being removed.
If you have projects saved on the website, you have a little over a month to download them, copy them, whatever you want to do, before the content on the website will be removed.
BXCoding have been wonderful partners supporting the Leopard website infrastructure at no cost to me during this period of a couple years. If you like Leopard, you should definitely also check out their project Patch which is like Scratch but in Python.
- Wayour
-
Scratcher
3 posts
Leopard: Edit Scratch projects as JavaScript code
Hey everyone!
The funding I had available to host the project editor directly on the Leopard website ran out. That means it's time to go back to editing within CodeSandbox or just downloading projects as a zip. The “Leopard Editor” option is being removed.
If you have projects saved on the website, you have a little over a month to download them, copy them, whatever you want to do, before the content on the website will be removed.
BXCoding have been wonderful partners supporting the Leopard website infrastructure at no cost to me during this period of a couple years. If you like Leopard, you should definitely also check out their project Patch which is like Scratch but in Python.
aww mannnnn
- _-_-F4F_-_-
-
Scratcher
16 posts
Leopard: Edit Scratch projects as JavaScript code
Hey everyone!
The funding I had available to host the project editor directly on the Leopard website ran out. That means it's time to go back to editing within CodeSandbox or just downloading projects as a zip. The “Leopard Editor” option is being removed.
If you have projects saved on the website, you have a little over a month to download them, copy them, whatever you want to do, before the content on the website will be removed.
BXCoding have been wonderful partners supporting the Leopard website infrastructure at no cost to me during this period of a couple years. If you like Leopard, you should definitely also check out their project Patch which is like Scratch but in Python.
Im honestly really sad
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