# 🛠 Developer Tools **URL:** https://forum.flow.com/c/developer-tools/11.md [Latest](https://forum.flow.com/latest.md) · [Categories](https://forum.flow.com/categories.md) · [Tags](https://forum.flow.com/tags.md) --- ## [About the 🛠 Developer Tools category](https://forum.flow.com/t/about-the-developer-tools-category/116)
**Author:** [@Mackenzie](https://forum.flow.com/u/Mackenzie)\ **Replies:** 0
Use this category to discuss Flow Dev Tools related issues, bugs or improvement feedback --- ## [Guidance Needed on Flow.com Vulnerability Report Submission](https://forum.flow.com/t/guidance-needed-on-flow-com-vulnerability-report-submission/7895)
**Author:** [@Ridoyp99](https://forum.flow.com/u/Ridoyp99)\ **Replies:** 0\ **Last updated:** [June 2, 2025, 4:57pm UTC](https://forum.flow.com/t/guidance-needed-on-flow-com-vulnerability-report-submission/7895 "2025-06-02T16:57:06Z")
Dear Flow Team, I have discovered a potential vulnerability on flow.com. As per your bug bounty guidelines, I initially submitted the report to security@onflow.org. Shortly after, I received an automated response instr… --- ## [Replacing NFT Catalog with a Decentralized Alternative \[Proposal\]](https://forum.flow.com/t/replacing-nft-catalog-with-a-decentralized-alternative-proposal/6723)
**Author:** [@Aliserag](https://forum.flow.com/u/Aliserag)\ **Replies:** 4\ **Last updated:** [October 28, 2024, 6:22pm UTC](https://forum.flow.com/t/replacing-nft-catalog-with-a-decentralized-alternative-proposal/6723 "2024-10-28T18:22:56Z")
This post is to discuss officially sunsetting support for NFT Catalog in favor of Tokenlist, a more decentralized alternative. Conversations around NFT Catalog and the creation of Tokenlist have been discussed over multi… --- ## [How To Use Flow Wallet Mobile App as a "Popup"?](https://forum.flow.com/t/how-to-use-flow-wallet-mobile-app-as-a-popup/6711)
**Author:** [@uandere](https://forum.flow.com/u/uandere)\ **Replies:** 0\ **Last updated:** [October 11, 2024, 6:58am UTC](https://forum.flow.com/t/how-to-use-flow-wallet-mobile-app-as-a-popup/6711 "2024-10-11T06:58:44Z")
Hello to everyone here! My name is Nazar, and I am a software engineer who recently started to use Flow, and Flow wallet in particular. And I need your expertise, please. The testnet version of what I’m trying to do is… --- ## [What is the Best Methods for Flow Blockchain Cadence Contract Optimization?](https://forum.flow.com/t/what-is-the-best-methods-for-flow-blockchain-cadence-contract-optimization/6439)
**Author:** [@jackmark](https://forum.flow.com/u/jackmark)\ **Replies:** 0\ **Last updated:** [August 30, 2024, 5:23am UTC](https://forum.flow.com/t/what-is-the-best-methods-for-flow-blockchain-cadence-contract-optimization/6439 "2024-08-30T05:23:05Z")
Hello Flow community Member, I have been working on a project that involves creating Cadence contracts for a decentralized application on the Flow blockchai; I want to maximize the performance and security of my contrac… --- ## [Tools, Library and SDK versions for Cadence 1.0](https://forum.flow.com/t/tools-library-and-sdk-versions-for-cadence-1-0/6434)
**Author:** [@vishal](https://forum.flow.com/u/vishal)\ **Replies:** 0\ **Last updated:** [August 28, 2024, 7:13pm UTC](https://forum.flow.com/t/tools-library-and-sdk-versions-for-cadence-1-0/6434 "2024-08-28T19:13:25Z")
Here are the latest releases of the tools, libraries and SDKs that support Cadence 1.0. Flow Testnet has been upgraded and is currently running Cadence 1.0. Please use these versions as the minimum version for Testnet. … --- ## [How to give an array as an arguement in transaction in cadence?](https://forum.flow.com/t/how-to-give-an-array-as-an-arguement-in-transaction-in-cadence/6142)
**Author:** [@blockphy](https://forum.flow.com/u/blockphy)\ **Replies:** 0\ **Last updated:** [June 10, 2024, 5:53am UTC](https://forum.flow.com/t/how-to-give-an-array-as-an-arguement-in-transaction-in-cadence/6142 "2024-06-10T05:53:20Z")
how to give an array as an arguement in transaction in cadence ?like for example : transaction(prod\_id: String, productname: String, orderids: \[String\], min\_review\_count: UInt256, prod\_details: String) {} here how ord… --- ## [Access to historical data / blocks](https://forum.flow.com/t/access-to-historical-data-blocks/5612)
**Author:** [@agardez](https://forum.flow.com/u/agardez)\ **Replies:** 0\ **Last updated:** [January 24, 2024, 4:18pm UTC](https://forum.flow.com/t/access-to-historical-data-blocks/5612 "2024-01-24T16:18:39Z")
Hello community, I’m working on indexing historical data for all events across the Flow blockchain. This is so that we can for instance later aggregate the events to compute balances for accounts. From my understanding… --- ## [Can't get events using the Access API](https://forum.flow.com/t/cant-get-events-using-the-access-api/5473)
**Author:** [@agardez](https://forum.flow.com/u/agardez)\ **Replies:** 3\ **Last updated:** [December 15, 2023, 7:42pm UTC](https://forum.flow.com/t/cant-get-events-using-the-access-api/5473 "2023-12-15T19:42:50Z")
Hello Flow community, I want to figure out how to fetch all events and transactions for a given block height. I am trying to do it using the HTTP access API (I’m open to another way too). First, I get a given block us… --- ## [Compile errors in the Flow App Quickstart on Step 2](https://forum.flow.com/t/compile-errors-in-the-flow-app-quickstart-on-step-2/2678)
**Author:** [@orby](https://forum.flow.com/u/orby)\ **Replies:** 1\ **Last updated:** [December 26, 2021, 8:04pm UTC](https://forum.flow.com/t/compile-errors-in-the-flow-app-quickstart-on-step-2/2678 "2021-12-26T20:04:34Z")
I was trying to follow the quick start docs Flow Documentation I tested these results on: Arch Linux, Ubuntu 20.04 and 20.10 and MacOSX. Unfortunately all attempts produce the same error. When I get to the configuratio… --- ## [Seeking feedback on Cadence Cookbook modernization](https://forum.flow.com/t/seeking-feedback-on-cadence-cookbook-modernization/5200)
**Author:** [@jeromep](https://forum.flow.com/u/jeromep)\ **Replies:** 3\ **Last updated:** [September 9, 2023, 8:31am UTC](https://forum.flow.com/t/seeking-feedback-on-cadence-cookbook-modernization/5200 "2023-09-09T08:31:27Z")
Hi Flow Fam, We’re working on improvements to the Cadence Cookbook (https://cookbook.flow.com/) with a number of new changes that will be funded through grants. We’re still in early stages are working through the UI/UX … --- ## [Faucet for emulator?](https://forum.flow.com/t/faucet-for-emulator/4953)
**Author:** [@that83](https://forum.flow.com/u/that83)\ **Replies:** 1\ **Last updated:** [June 29, 2023, 6:27pm UTC](https://forum.flow.com/t/faucet-for-emulator/4953 "2023-06-29T18:27:12Z")
Hi, I am running kitty-items (https://github.com/onflow/kitty-items) in emulator. I see FlowToken contract at 0x0ae53cb6e3f42a79 but don’t know how to get FLOW from it to test. Is there a faucet page for emulator or some… --- ## [Getting Staking holdings](https://forum.flow.com/t/getting-staking-holdings/4842)
**Author:** [@techpi](https://forum.flow.com/u/techpi)\ **Replies:** 0\ **Last updated:** [June 5, 2023, 5:57am UTC](https://forum.flow.com/t/getting-staking-holdings/4842 "2023-06-05T05:57:02Z")
I want to check the holdings of stakings and its rewards of a particular delegator programatically. How can I get its api or rpc method to interact --- ## [CLI Issues when adding contact to mainnet account](https://forum.flow.com/t/cli-issues-when-adding-contact-to-mainnet-account/3103)
**Author:** [@zaneousryan](https://forum.flow.com/u/zaneousryan)\ **Replies:** 15\ **Last updated:** [May 10, 2023, 9:01am UTC](https://forum.flow.com/t/cli-issues-when-adding-contact-to-mainnet-account/3103 "2023-05-10T09:01:56Z")
Hello, My team and I have been working on a NFT distribution app utilizing the flow blockchain. We have everything working and are ready for our first event but I am having a very difficult time getting everything setup… --- ## [Cadence LSP in Neovim](https://forum.flow.com/t/cadence-lsp-in-neovim/3875)
**Author:** [@archer](https://forum.flow.com/u/archer)\ **Replies:** 7\ **Last updated:** [May 3, 2023, 5:59pm UTC](https://forum.flow.com/t/cadence-lsp-in-neovim/3875 "2023-05-03T17:59:08Z")
Neovim has built in LSP support, and the Flow CLI tool has language-server capabilities built into it, so I’m trying to get it working in Neovim. This is in lieu of LSP support from the nvim-lspconfig plugin, which I am … --- ## [Flow Archive Node](https://forum.flow.com/t/flow-archive-node/4095)
**Author:** [@Liza\_GetBlock](https://forum.flow.com/u/Liza_GetBlock)\ **Replies:** 1\ **Last updated:** [February 1, 2023, 12:44am UTC](https://forum.flow.com/t/flow-archive-node/4095 "2023-02-01T00:44:25Z")
Hi everyone! I’m Liza from GetBlock, our team is currently building a grant project for FLOW, and last year we discussed an archive node that we’d eventually need for development. The ETA for deploying FLOW archive node… --- ## [Cadence linter](https://forum.flow.com/t/cadence-linter/3541)
**Author:** [@cadencesensei](https://forum.flow.com/u/cadencesensei)\ **Replies:** 2\ **Last updated:** [November 23, 2022, 8:11pm UTC](https://forum.flow.com/t/cadence-linter/3541 "2022-11-23T20:11:31Z")
Hi all, is there any linter for cadence that can be used on a node/js project? --- ## [How to derive keys from a mnemonic?](https://forum.flow.com/t/how-to-derive-keys-from-a-mnemonic/3758)
**Author:** [@ozgrozer](https://forum.flow.com/u/ozgrozer)\ **Replies:** 0\ **Last updated:** [October 25, 2022, 3:59pm UTC](https://forum.flow.com/t/how-to-derive-keys-from-a-mnemonic/3758 "2022-10-25T15:59:02Z")
Lilico has an option to import accounts with a mnemonic. I’m also trying the same thing but no hope for now. In Flow’s documentation there’s a note about the topic but the “FLIP” link doesn’t work. I was wondering … --- ## [Removing contract failed: \[Error Code: 1056\] (RemoveContract) is not authorized: removing contracts requires authorization from specific accounts](https://forum.flow.com/t/removing-contract-failed-error-code-1056-removecontract-is-not-authorized-removing-contracts-requires-authorization-from-specific-accounts/3694)
**Author:** [@vasu5235](https://forum.flow.com/u/vasu5235)\ **Replies:** 1\ **Last updated:** [October 6, 2022, 5:24pm UTC](https://forum.flow.com/t/removing-contract-failed-error-code-1056-removecontract-is-not-authorized-removing-contracts-requires-authorization-from-specific-accounts/3694 "2022-10-06T17:24:13Z")
Using flow-cli, if I run flow accounts remove-contract HelloWorld --network testnet --signer testnet-account I get the above error. I created the contract using the same account but unable to remove it from testnet. I r… --- ## [Error executing script listing large TopShot account](https://forum.flow.com/t/error-executing-script-listing-large-topshot-account/3600)
**Author:** [@jkdalemu](https://forum.flow.com/u/jkdalemu)\ **Replies:** 0\ **Last updated:** [September 22, 2022, 2:08am UTC](https://forum.flow.com/t/error-executing-script-listing-large-topshot-account/3600 "2022-09-22T02:08:28Z")
Is there some sort of upper limit on script execution in the CLI? I’ve been exploring some of the example script in the TopShot repo and I noticed if I try to list all the moments owned by some od the large accounts, I s… --- ## [Provide on-chain and off-chain information for Spork information](https://forum.flow.com/t/provide-on-chain-and-off-chain-information-for-spork-information/3523)
**Author:** [@yagop](https://forum.flow.com/u/yagop)\ **Replies:** 2\ **Last updated:** [August 31, 2022, 10:51pm UTC](https://forum.flow.com/t/provide-on-chain-and-off-chain-information-for-spork-information/3523 "2022-08-31T22:51:09Z")
There is lack of information needed related to Sporks. First of all, the previous Mainnet must stop generating blocks, we can see how Mainnet 18 is still producing blocks while Mainnet 19 is still active. That creates a… --- ## [Problem Blocto login on testnet](https://forum.flow.com/t/problem-blocto-login-on-testnet/3538)
**Author:** [@Johnna](https://forum.flow.com/u/Johnna)\ **Replies:** 0\ **Last updated:** [August 28, 2022, 10:19am UTC](https://forum.flow.com/t/problem-blocto-login-on-testnet/3538 "2022-08-28T10:19:16Z")
Hi, Please I don’t understand why I have this problem to login with blocto on the testnet. I get this message when I select “blocto”: I haven’t changed anything in the meantime. Do you have any idea about this prob… --- ## [Dapper support for Account Proofs](https://forum.flow.com/t/dapper-support-for-account-proofs/3520)
**Author:** [@kingkm](https://forum.flow.com/u/kingkm)\ **Replies:** 0\ **Last updated:** [August 24, 2022, 7:59pm UTC](https://forum.flow.com/t/dapper-support-for-account-proofs/3520 "2022-08-24T19:59:45Z")
Looking for guidance on account proofs support from Dapper wallet. Blocto wallet works perfectly on testnet, and I’m hoping to utilize the same strategy for Dapper. --- ## [Flow CLI Windows 11 Installation](https://forum.flow.com/t/flow-cli-windows-11-installation/3485)
**Author:** [@nslee333](https://forum.flow.com/u/nslee333)\ **Replies:** 0\ **Last updated:** [August 6, 2022, 1:20am UTC](https://forum.flow.com/t/flow-cli-windows-11-installation/3485 "2022-08-06T01:20:22Z")
Hey there, new to the Flow community and learning development, currently working through LearnWeb3’s newly released Flow cirriculum. I’m working on getting my development environment setup, and I noticed that the Flow C… --- ## [Issues after updating flow-cli version](https://forum.flow.com/t/issues-after-updating-flow-cli-version/3212)
**Author:** [@Sols](https://forum.flow.com/u/Sols)\ **Replies:** 2\ **Last updated:** [June 14, 2022, 1:45am UTC](https://forum.flow.com/t/issues-after-updating-flow-cli-version/3212 "2022-06-14T01:45:29Z")
I built some smart contracts and tested them using CLI in version 0.33.0 It was working wonderfully. However, after updating it to v0.350 / 0.36.0, it is not working. I can’t even deploy some contracts because of erro… --- ## [FCL 1.0 is now live!](https://forum.flow.com/t/fcl-1-0-is-now-live/3117)
**Author:** [@srinjoy](https://forum.flow.com/u/srinjoy)\ **Replies:** 2\ **Last updated:** [May 19, 2022, 8:52pm UTC](https://forum.flow.com/t/fcl-1-0-is-now-live/3117 "2022-05-19T20:52:40Z")
:tada: As announced in-office hours last week, FCL 1.0 has been published to the latest stable build! See the release notes here. Why should you upgrade? Get access to the latest wallet types on Flow - browser extensi… --- ## [How do I verify a FLOW address](https://forum.flow.com/t/how-do-i-verify-a-flow-address/3016)
**Author:** [@chai](https://forum.flow.com/u/chai)\ **Replies:** 0\ **Last updated:** [April 11, 2022, 10:40am UTC](https://forum.flow.com/t/how-do-i-verify-a-flow-address/3016 "2022-04-11T10:40:50Z")
I am a backend developer. You know, we can’t trust the data that frontend send to me. So I need verify the address. I want to know which way will be convenient for verify is the address valid ? --- ## [AccountObject (balance)](https://forum.flow.com/t/accountobject-balance/2990)
**Author:** [@sylv1un](https://forum.flow.com/u/sylv1un)\ **Replies:** 1\ **Last updated:** [April 6, 2022, 2:44pm UTC](https://forum.flow.com/t/accountobject-balance/2990 "2022-04-06T14:44:20Z")
Hi there, I want to retrieve the Flow balance from a blocto wallet account to display it in the user profile. For this I retrieve an “AccountObject using this function: fcl.getAccount(address). But when I check the retr… --- ## [Type title ,or paste a link here](https://forum.flow.com/t/type-title-or-paste-a-link-here/2815)
**Author:** [@Diyab77](https://forum.flow.com/u/Diyab77)\ **Replies:** 1\ **Last updated:** [March 1, 2022, 6:29pm UTC](https://forum.flow.com/t/type-title-or-paste-a-link-here/2815 "2022-03-01T18:29:44Z")
Continuing the discussion from Community Feedback for CryptoDappy Beta: --- ## [Flow CLI on browser](https://forum.flow.com/t/flow-cli-on-browser/2690)
**Author:** [@beppeben](https://forum.flow.com/u/beppeben)\ **Replies:** 2\ **Last updated:** [January 3, 2022, 5:14pm UTC](https://forum.flow.com/t/flow-cli-on-browser/2690 "2022-01-03T17:14:47Z")
Hi, I was exploring the Flow client library and found instructions to run server-side commands like npm, so I’m a bit confused. Is there a library that is entirely client side? Thanks. [Next page](https://forum.flow.com/c/developer-tools/11.md?page=1)