FastFlag import · inspect before merge

Import JSON or TXT without importing assumptions.

Q: Can Luczystrap import both JSON and TXT FastFlag files?

Yes. Luczystrap release 1.3 documents both .json and .txt files. The official 1.3 dialog reads either file as text into the same Import JSON field, so TXT is a container for JSON-formatted content rather than a separate key=value grammar.

Q: What structure should a Luczystrap FastFlag import use?

Use one JSON object whose property names are exact FastFlag keys and whose property values use the intended JSON types. Keep the first test to one current allowlisted key.

Q: Does a TXT extension make a FastFlag pack safer?

No. JSON and TXT describe how the content is carried, not who created it, whether its keys are still allowlisted, or whether its values are appropriate for your setup.

Q: What happens when imported FastFlags already exist?

The official 1.3 importer identifies conflicting keys and asks whether to overwrite them. Declining preserves existing conflicting values while nonconflicting entries can still be imported. Export a backup and review every conflict before deciding.

Q: Why does Luczystrap say my JSON is invalid?

Common causes include an array instead of an object, single quotes, unquoted keys, missing commas, unmatched braces, copied prose, or key=value lines. Use strict JSON even though the historical importer tolerated comments, trailing commas, and some missing outer braces.

Q: Why was my file imported but the FastFlags do not work?

Import success proves that Luczystrap accepted local data. Roblox separately recognizes only exact keys on its current local allowlist, and a recognized key can still have an unsuitable value or no visible effect in the chosen test scene.

Q: How do I back up FastFlags before importing?

Use Export JSON, paste the copied result into a dated .json file, record the Luczystrap version, and keep that file outside the active Roblox and Luczystrap configuration paths.

Q: Should I import a large FastFlag pack from Discord or a video?

Not blindly. Review the source and every exact key, remove entries outside Roblox's current allowlist, make a backup, and reduce the first test to one change. A filename or performance claim is not evidence that the pack is current or useful.

Luczystrap accepts FastFlag lists from .json and .txt. Both routes feed JSON-formatted text into the editor. Review the object, back up the current set, resolve conflicts deliberately, and test one change.

File extension is not a trust signal. A pack can parse successfully and still contain obsolete, ignored, conflicting, or unexplained keys.

Written by Luc6iProduct baseline Luczystrap 1.4.9Import introduced Version 1.3

Inspect a file locally Open the import steps →

01 / Short answer

Two extensions. One JSON importer.

Release 1.3 explicitly added both file types. Its official dialog loads either file with File.ReadAllText into the same Import JSON text box; it does not define a second line-based TXT language.

What the software boundary establishes

A .json file and a .txt file can carry the same JSON object. The extension controls which files the picker offers; the content still needs to represent flag names and values.

The historical importer then checks syntax, warns when a list contains more than 16 entries, identifies conflicts with existing keys, and asks whether those conflicts should be overwritten. Current application source is not published, so exact 1.4.9 parser internals remain a historical-code boundary, not an independently audited current guarantee.

.json

Prefer the descriptive extension

Use it for a reviewed object you intend to keep as a backup or controlled import.

.txt

Plain-text container

Open and inspect it first. Do not assume Flag=True or one key per line is accepted.

Roblox

Recognition happens later

The current local allowlist, not Luczystrap's parser, decides which exact keys Player recognizes.

02 / Safe structure

Keep the first object strict and small.

The historical parser tolerated comments, trailing commas, and some missing outer braces. This guide uses strict JSON because it is predictable across editors, validators, backups, and future migrations.

A reviewable import has one top-level object.

Each property name is an exact FastFlag key. Each property value keeps the intended type. The example shows structure, not a universal recommendation for that value.

Quoted keys: JSON requires double quotes.
One colon: separates each key from its value.
Commas: separate entries, not the final entry.
Matching braces: enclose the complete object.
No duplicate keys: one decision per exact name.

minimal-review.json1 key

{
  "FFlagHandleAltEnterFullscreenManually": "True"
}

InvalidSingle quotes

{'Flag': true} is not strict JSON.

InvalidTop-level array

[{"Flag":true}] is not the expected map.

InvalidKey=value lines

Flag=True is not the documented JSON shape.

ReviewNested values

Use primitive string, number, or boolean values unless a source proves otherwise.

03 / Local preflight

See what the file asks to change.

Paste JSON or choose a local .json/.txt file. This browser-only checker uses strict JSON, lists every key, and compares names with the 18-key Roblox allowlist snapshot checked August 1, 2026. It does not import into Luczystrap or upload the file.

FastFlag objectProcessed only in this tab

Choose JSON or TXT

Exact keyValue typeAllowlist snapshot

Validate the example or choose a file to build the preview.

04 / Import workflow

Back up before the merge decision.

The sequence keeps parsing, merging, saving, Roblox recognition, and observable effect as separate checkpoints. Stop at the first one that fails.

STEP 01

Fully close Roblox

End the current Player session before changing the local configuration. The next launch should be a clear before/after boundary, not a process that already loaded old values.

STEP 02

Export the current editor state

Choose Export JSON. Historical code copies formatted JSON to the clipboard and asks whether preset flags should be included. Paste the result into a dated file such as fastflags-before-2026-08-01.json and keep it outside active configuration folders.

STEP 03

Audit the incoming source

Record where the file came from, open it as text, count the keys, and understand the intended change. Check each exact name against the current Roblox allowlist. Remove unrelated or unexplained entries before import.

STEP 04

Open the Import JSON tab

In the captured 1.4.9 interface, open Engine Settings → FastFlag Editor. Choose Add new, then open Import JSON. Labels may differ in translated interfaces.

STEP 05

Paste or import the reviewed file

Paste the strict object into the text field, or choose Import from file and select the reviewed .json or .txt. Inspect the visible text before confirming.

STEP 06

Read every warning

Invalid JSON means stop and fix the object. A large-config warning means reduce scope. A conflict prompt means existing keys already have values—decline overwrite unless the backup and intended replacement are both clear.

STEP 07

Save one controlled state

Review the resulting rows, then choose Save or Save and launch. A green saved notification proves persistence only. It does not prove current allowlist recognition or benefit.

STEP 08

Relaunch, test, and undo

Fully restart Roblox and repeat the same scene and settings. If the result is unstable, invisible, or unexplained, restore the dated backup, save, relaunch, and confirm the baseline returns.

Do not use import as a bypass. If a key is absent from Roblox's current local allowlist, importing it through TXT, removing braces, renaming the pack, or adding it through IXP does not turn it into an ordinary recognized local override.

05 / Import decisions

Read the message before clicking through.

Historical 1.3 source makes these decisions visible. Treat them as recovery boundaries even if translated wording or current UI placement differs.

Luczystrap state	What it means	Safe decision
Invalid JSON	The importer could not deserialize the text into a key/value object.	Cancel, preserve the original, and correct syntax in a copy.Do not guess in-place
More than 16 entries	The historical importer deliberately treats the set as large.	Return to the file and reduce the first test to one understood key.Scope warning
Conflicting keys found	One or more incoming names already exist in the editor.	Compare old and new values. Keep existing conflicts unless replacement is intentional and recoverable.Merge decision
Null value	The historical importer skips a key whose value is null.	Replace it only when the intended primitive value is proven; otherwise remove the entry.No assumed value
Rows appear in the editor	The local merge completed.	Review, save, relaunch, then test. Do not call the pack working yet.Import boundary complete
Saved but no effect	Persistence succeeded; allowlist recognition, value validity, or test visibility did not.	Check the exact key and undo before adding anything else.Different boundary

06 / Third-party packs

Reject claims the file cannot prove.

The reviewed videos confirm demand for copying large lists into Luczystrap, but they do not establish authorship, current policy compatibility, a controlled benchmark, or a safe value for every machine.

Claim 01

“Maximum FPS”

A large list changes many variables at once. Without a fixed baseline, repeated scene, frame-time capture, and one-change rollback, the filename cannot attribute a result.

Require: controlled before/after evidence.

Claim 02

“After patch”

Roblox can update the local allowlist without notice. A video date, Discord upload date, or renamed pack does not prove every key remains recognized today.

Require: exact live-list match.

Claim 03

“Safe for everyone”

Even a recognized key can change image quality, rendering behavior, accessibility, or stability. Hardware and experience-specific trade-offs still need a reversible test.

Require: known value, scope, and undo.

07 / FAQ

FastFlag import questions.

Direct answers for formats, structure, conflicts, backups, invalid JSON, ignored keys, and external packs.

Can Luczystrap import both JSON and TXT FastFlag files?

What structure should a Luczystrap FastFlag import use?

Does a TXT extension make a FastFlag pack safer?

What happens when imported FastFlags already exist?

Why does Luczystrap say my JSON is invalid?

Why was my file imported but the FastFlags do not work?

How do I back up FastFlags before importing?

Should I import a large FastFlag pack from Discord or a video?

08 / Continue by boundary

Use the next page for the failed checkpoint.

Do not repeat the import when the remaining question is policy, measurement, file access, or return to defaults.

Key recognition

Current Roblox allowlist

Search the exact 18-key snapshot and open the canonical Roblox source.

Check every name →Measure one change

One-flag A/B protocol

Alternate original and candidate states, compare repeated runs, and exclude placebo.

Open testing notebook →Need rollback

Reset FastFlags

Return the local configuration to a known baseline after an import.

Open complete reset →Write failed

ClientAppSettings access

Repair the exact configuration-file boundary without deleting broad folders.

Open access recovery →

09 / Evidence record

Product code defines the import boundary.

Release notes establish the feature. Historical official source establishes the dialog and parser decisions. The latest UI video confirms the current editor workflow; Roblox remains the authority for locally recognized keys.

Luczystrap · official releaseVersion 1.3: JSON and TXT import

Published October 24, 2025.

Open release →Luczystrap · historical sourceFile picker and shared JSON text field

Both extensions are read as plain text.

Open dialog source →Luczystrap · historical sourceParser, size warning, conflicts and export

Exact 1.3 merge behavior.

Open importer source →Visual transcript · January 2026Luczystrap 1.4.9 editor and saved state

Used for current UI orientation, not pack claims.

Open video →Visual transcript · November 2025TXT source, editor paste, and launch flow

No explanatory narration or validated pack.

Open video →Roblox · official policyLive local FastFlag allowlist

Controls recognition after import.

Open policy →

Current Luczystrap application source is not available for independent inspection. Where current behavior is not visible in the 1.4.9 workflow, this page labels the implementation as historical 1.3 evidence instead of presenting it as audited current code.