# šŸ›  Developer Tools **URL:** https://forum.flow.com/c/developer-tools/11.md?page=2 [Latest](https://forum.flow.com/latest.md) Ā· [Categories](https://forum.flow.com/categories.md) Ā· [Tags](https://forum.flow.com/tags.md) **Page:** 3 --- ## [Kitty Items has been Upgraded!](https://forum.flow.com/t/kitty-items-has-been-upgraded/1577)
**Author:** [@Mackenzie](https://forum.flow.com/u/Mackenzie)\ **Replies:** 1\ **Last updated:** [March 27, 2021, 4:21pm UTC](https://forum.flow.com/t/kitty-items-has-been-upgraded/1577 "2021-03-27T16:21:41Z")
Kitty Items has been upgraded. Itā€™s now a true p2p NFT marketplace! :sparkles: Weā€™ve added a simple block-polling service that listens for marketplace events and aggregates sale offers to all users of the app! Along wiā€¦ --- ## [Debugging Kitty Items using VSCode](https://forum.flow.com/t/debugging-kitty-items-using-vscode/1579)
**Author:** [@Mackenzie](https://forum.flow.com/u/Mackenzie)\ **Replies:** 0\ **Last updated:** [March 26, 2021, 3:33pm UTC](https://forum.flow.com/t/debugging-kitty-items-using-vscode/1579 "2021-03-26T15:33:03Z")
Hereā€™s the VSCode config for debugging the Kitty-Items project: For the API: Start the API using the built-in debugger ā€œLaunch APIā€. For the web project, first run: npm run start:dev and then run the debugger ā€œDebug Wā€¦ --- ## [Documentation out of sync with Flow Playground](https://forum.flow.com/t/documentation-out-of-sync-with-flow-playground/1076)
**Author:** [@morgan](https://forum.flow.com/u/morgan)\ **Replies:** 6\ **Last updated:** [March 23, 2021, 2:22pm UTC](https://forum.flow.com/t/documentation-out-of-sync-with-flow-playground/1076 "2021-03-23T14:22:50Z")
Hello Flow community! This is my first post so pardon my ignorance, but I wonder if thereā€™s anything I could do about certain things being out of sync between the documentation and the playground? For example, https://ā€¦ --- ## [Can I deploy dApps without FLOW tokens?](https://forum.flow.com/t/can-i-deploy-dapps-without-flow-tokens/1060)
**Author:** [@liamdanielduffy](https://forum.flow.com/u/liamdanielduffy)\ **Replies:** 5\ **Last updated:** [March 12, 2021, 6:16pm UTC](https://forum.flow.com/t/can-i-deploy-dapps-without-flow-tokens/1060 "2021-03-12T18:16:00Z")
I recently became interested in building my own NFT Marketplace with Flow. While I understand that my users do not have to own FLOW tokens to use my dApp, it seems like I, as the marketplace operator, need to hold FLOW ā€¦ --- ## [Flow CLI as a development tool](https://forum.flow.com/t/flow-cli-as-a-development-tool/809)
**Author:** [@pete](https://forum.flow.com/u/pete)\ **Replies:** 12\ **Last updated:** [March 8, 2021, 11:27am UTC](https://forum.flow.com/t/flow-cli-as-a-development-tool/809 "2021-03-08T11:27:34Z")
Iā€™m starting to put some more thought into how the CLI could be better designed as a development tool and not just a utility to query the chain. Iā€™m specifically interested in streamlining the local development workflow ā€¦ --- ## [Decode private key failed error when using emulator](https://forum.flow.com/t/decode-private-key-failed-error-when-using-emulator/1235)
**Author:** [@CoachGibbo](https://forum.flow.com/u/CoachGibbo)\ **Replies:** 1\ **Last updated:** [March 8, 2021, 9:57am UTC](https://forum.flow.com/t/decode-private-key-failed-error-when-using-emulator/1235 "2021-03-08T09:57:24Z")
flow.json contains invalid json: decode private key failed: the signature scheme UNKNOWN is not supported. Stuck with this error whenever I try and send a transaction with the Flow CLI. The error is definitely with my fā€¦ --- ## [Running scripts with parameters](https://forum.flow.com/t/running-scripts-with-parameters/1156)
**Author:** [@JapaneseCatGuy](https://forum.flow.com/u/JapaneseCatGuy)\ **Replies:** 3\ **Last updated:** [March 3, 2021, 5:52pm UTC](https://forum.flow.com/t/running-scripts-with-parameters/1156 "2021-03-03T17:52:50Z")
Hello, Iā€™m a new developer learning flow particularly interested in making a 3rd party application for nba top shot. Iā€™ve been following the readme from the nba top shot smart contract repo and so far Iā€™ve been able to rā€¦ --- ## [How to get Flow token for the test net?](https://forum.flow.com/t/how-to-get-flow-token-for-the-test-net/674)
**Author:** [@yugo](https://forum.flow.com/u/yugo)\ **Replies:** 3\ **Last updated:** [February 28, 2021, 10:46pm UTC](https://forum.flow.com/t/how-to-get-flow-token-for-the-test-net/674 "2021-02-28T22:46:24Z")
Does anyone know how to get a Flow token for the test net? I am trying to use the below settings for accessing the node. fcl .config() .put('accessNode.api', 'https://access-testnet.onflow.org') // connect to Flow ā€¦ --- ## [Is the NFT basic contract missing in the emulator-net?](https://forum.flow.com/t/is-the-nft-basic-contract-missing-in-the-emulator-net/899)
**Author:** [@fabius](https://forum.flow.com/u/fabius)\ **Replies:** 10\ **Last updated:** [February 23, 2021, 12:13am UTC](https://forum.flow.com/t/is-the-nft-basic-contract-missing-in-the-emulator-net/899 "2021-02-23T00:13:36Z")
Hi guys! Iā€™m playing with the emulator trying to recreate the kitty-items repository. When setting the NON\_FUNGIBLE\_TOKEN\_ADDRESS in the .env file (kitty-items-deployer) I noted that in the log of the command 'flow emulaā€¦ --- ## [Attach VSCode to a running emulator?](https://forum.flow.com/t/attach-vscode-to-a-running-emulator/906)
**Author:** [@pdahlberg](https://forum.flow.com/u/pdahlberg)\ **Replies:** 3\ **Last updated:** [February 12, 2021, 5:15am UTC](https://forum.flow.com/t/attach-vscode-to-a-running-emulator/906 "2021-02-12T05:15:04Z")
Is there any way to ā€œattachā€ the VSCode extension to an emulator already running in the terminal? --- ## [Typical dapp project structure](https://forum.flow.com/t/typical-dapp-project-structure/814)
**Author:** [@pete](https://forum.flow.com/u/pete)\ **Replies:** 9\ **Last updated:** [February 11, 2021, 7:05am UTC](https://forum.flow.com/t/typical-dapp-project-structure/814 "2021-02-11T07:05:47Z")
Thereā€™s been some discussion about how to best structure the codebase of a Flow application. Often this means finding a home for the following: Cadence smart contracts Cadence transactions and scripts Frontend web app ā€¦ --- ## [Trying to get started, Need some help](https://forum.flow.com/t/trying-to-get-started-need-some-help/871)
**Author:** [@TradeUpCards](https://forum.flow.com/u/TradeUpCards)\ **Replies:** 3\ **Last updated:** [February 9, 2021, 8:23pm UTC](https://forum.flow.com/t/trying-to-get-started-need-some-help/871 "2021-02-09T20:23:44Z")
Hello, I havenā€™t coded websites or anything related to them in about 18+ years. Iā€™m trying to learn the syntax, packages, software needed to develop some tools to work with Flow. I have installed VScode and been playinā€¦ --- ## [Attempting to Implement "Hello World" example in VSCode](https://forum.flow.com/t/attempting-to-implement-hello-world-example-in-vscode/269)
**Author:** [@jacobtucker](https://forum.flow.com/u/jacobtucker)\ **Replies:** 8\ **Last updated:** [February 2, 2021, 4:42am UTC](https://forum.flow.com/t/attempting-to-implement-hello-world-example-in-vscode/269 "2021-02-02T04:42:47Z")
Hello everyone, I hope you are all doing well. I am attempting to implement the weekly tech assignment regarding the ā€œHello Worldā€ example while using the CLI and Emulator. I downloaded VSCode and followed the instructiā€¦ --- ## [Create a new flow wallet](https://forum.flow.com/t/create-a-new-flow-wallet/743)
**Author:** [@jnuno98](https://forum.flow.com/u/jnuno98)\ **Replies:** 4\ **Last updated:** [January 12, 2021, 11:01pm UTC](https://forum.flow.com/t/create-a-new-flow-wallet/743 "2021-01-12T23:01:17Z")
Hello! (two part question) I am building a mobile application where I would like to ask the user to log in with an existent flow wallet with a PK or seed phrase. And also would like to have other option to ā€œcreateā€¦ --- ## [Error while deploying tutorial & possible bug in tutorial's withdraw()](https://forum.flow.com/t/error-while-deploying-tutorial-possible-bug-in-tutorials-withdraw/707)
**Author:** [@Kalin](https://forum.flow.com/u/Kalin)\ **Replies:** 2\ **Last updated:** [January 4, 2021, 4:21pm UTC](https://forum.flow.com/t/error-while-deploying-tutorial-possible-bug-in-tutorials-withdraw/707 "2021-01-04T16:21:29Z")
Hello everyone, two things: Iā€™ve just stared playing around and unfortunately I came across this message on the first step of Fungible Token tutorial (deploying FungibleToken.cdc on account 0x01): Any idea why or ā€¦ --- ## [꜉äŗŗēŸ„é“ę€Žä¹ˆåŠžå‘¢ļ¼Ÿwho can help me?čæ™ę˜Æbug嘛ļ¼Ÿ](https://forum.flow.com/t/who-can-help-me-bug/683)
**Author:** [@Miracle](https://forum.flow.com/u/Miracle)\ **Replies:** 4\ **Last updated:** [December 25, 2020, 12:36pm UTC](https://forum.flow.com/t/who-can-help-me-bug/683 "2020-12-25T12:36:47Z")
--- ## [Fatal error : stack overflow](https://forum.flow.com/t/fatal-error-stack-overflow/569)
**Author:** [@robinbonnin](https://forum.flow.com/u/robinbonnin)\ **Replies:** 2\ **Last updated:** [August 26, 2020, 12:58am UTC](https://forum.flow.com/t/fatal-error-stack-overflow/569 "2020-08-26T00:58:16Z")
Hi there ! I am working on my OWB project. It is very similar to NBA TopShot, just more decentralized. The idea is that celebrities could put their digital assets into decks and then people could mint those assets and ā€¦ --- ## [Blocto FCL Wallet - Request for Feedback](https://forum.flow.com/t/blocto-fcl-wallet-request-for-feedback/563)
**Author:** [@hlee](https://forum.flow.com/u/hlee)\ **Replies:** 5\ **Last updated:** [August 24, 2020, 3:32am UTC](https://forum.flow.com/t/blocto-fcl-wallet-request-for-feedback/563 "2020-08-24T03:32:49Z")
Hello Flow builders! As a lot of you may know, portto/Blocto has been working on building a FCL wallet that provides great user experience. Itā€™s currently available on Flow testnet and the mainnet version will be availaā€¦ --- ## [Playground Scripts - Export code as ZIP file](https://forum.flow.com/t/playground-scripts-export-code-as-zip-file/509)
**Author:** [@MaxStarka](https://forum.flow.com/u/MaxStarka)\ **Replies:** 0\ **Last updated:** [July 26, 2020, 10:25pm UTC](https://forum.flow.com/t/playground-scripts-export-code-as-zip-file/509 "2020-07-26T22:25:31Z")
Greetings, everyone! Iā€™ve created a little script, which will allow you to export all your contracts, transactions and scripts in a form of a ZIP file. It will also inherit contract name if it was deployed before exportā€¦ --- ## [Can you make Flow playground output bigger?](https://forum.flow.com/t/can-you-make-flow-playground-output-bigger/462)
**Author:** [@makoto](https://forum.flow.com/u/makoto)\ **Replies:** 5\ **Last updated:** [July 21, 2020, 1:02am UTC](https://forum.flow.com/t/can-you-make-flow-playground-output-bigger/462 "2020-07-21T01:02:49Z")
Currently itā€™s very small. Can you make it bigger or adjustable like ā€œstorageā€ section? --- ## [Is there a way to make Playground work in splitscreen mode?](https://forum.flow.com/t/is-there-a-way-to-make-playground-work-in-splitscreen-mode/417)
**Author:** [@miaow](https://forum.flow.com/u/miaow)\ **Replies:** 3\ **Last updated:** [July 20, 2020, 1:10pm UTC](https://forum.flow.com/t/is-there-a-way-to-make-playground-work-in-splitscreen-mode/417 "2020-07-20T13:10:17Z")
As someone who tends to use just 1 screen at a time, i tend to use splitscreen but find it very frustrating that I am unable to view the forum and playground in split screen as the playground keeps saying it works betterā€¦ --- ## [Transaction3.cdc for Fungible Tokens](https://forum.flow.com/t/transaction3-cdc-for-fungible-tokens/444)
**Author:** [@soft\_orca](https://forum.flow.com/u/soft_orca)\ **Replies:** 1\ **Last updated:** [July 18, 2020, 6:28pm UTC](https://forum.flow.com/t/transaction3-cdc-for-fungible-tokens/444 "2020-07-18T18:28:06Z")
what might be the issue for this error? Error Execution failed: unexpectedly found nil while forcing an Optional value Had the same error on vscode as well. --- ## [Tutorial - Marketplace - marketplace.cdc](https://forum.flow.com/t/tutorial-marketplace-marketplace-cdc/429)
**Author:** [@robinbonnin](https://forum.flow.com/u/robinbonnin)\ **Replies:** 2\ **Last updated:** [July 17, 2020, 2:32pm UTC](https://forum.flow.com/t/tutorial-marketplace-marketplace-cdc/429 "2020-07-17T14:32:00Z")
Hello ! I am trying to complete the Marketplace tutorial, however one piece of codecopied from the tutorial and the playground does not work in the VS Code extension :: // purchase lets a user send tokens to puā€¦ --- ## [Selecting account 1 by default](https://forum.flow.com/t/selecting-account-1-by-default/422)
**Author:** [@makoto](https://forum.flow.com/u/makoto)\ **Replies:** 3\ **Last updated:** [July 16, 2020, 8:16pm UTC](https://forum.flow.com/t/selecting-account-1-by-default/422 "2020-07-16T20:16:00Z")
When I start VS Code emulator, it select ā€œService accountsā€ as a default account, and I am manually selecting to account 1 to be able to deploy the smart contract. Unlike flow playground, it looks like I cannot keep deplā€¦ --- ## [Transaction failed to run (pasted from Hello World tutorial into VSCode)](https://forum.flow.com/t/transaction-failed-to-run-pasted-from-hello-world-tutorial-into-vscode/348)
**Author:** [@soft\_orca](https://forum.flow.com/u/soft_orca)\ **Replies:** 2\ **Last updated:** [July 13, 2020, 4:35pm UTC](https://forum.flow.com/t/transaction-failed-to-run-pasted-from-hello-world-tutorial-into-vscode/348 "2020-07-13T16:35:10Z")
Hi there, HelloWorld contract deployed. Active user: Account 1 (0x01). ā€œExecution failedā€ while trying to run the transaction, any suggestion? Code was copied from the playground. [Previous page](https://forum.flow.com/c/developer-tools/11.md?page=1)