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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchFirebase PERMISSION_DENIED in a React Native app means the request did not meet the authorization requirements for the service and resource it tried to access. The error alone does not identify the failing rule. First establish whether the request uses Cloud Firestore or Realtime Database, then compare the exact operation, path, signed-in identity, and deployed rules with a Firebase rules test.
Identify which Firebase service rejected the request
“Firebase” can mean several products, and their authorization rules are not interchangeable. This workflow covers Cloud Firestore and Realtime Database. If the failing call targets another service, such as Cloud Storage, these rule-specific steps do not establish the cause.
- Cloud Firestore: Requests target documents or queries and are evaluated against rules written with
matchpaths andallowexpressions. A denied document path causes the entire request to fail. - Realtime Database: Requests target locations in a data tree and are evaluated by JSON-like rules governing
.readand.write. Rules at a parent location can cascade to descendants, so inspect the full path hierarchy.
Record the product, exact path, and operation that fails: for example, whether the app is reading or writing a particular Firestore document, or reading or writing a Realtime Database node. That is the request you need to reproduce in a rules test.
Check the rules actually deployed to the app’s project
A local rules file is not necessarily the rules currently enforcing access. In the Firebase console, open the correct project and database, then inspect its deployed rules. Firebase notes that the console displays the most recently deployed rules and recommends consistently using one editing method to avoid overwriting changes. See Firebase’s Security Rules getting-started guide.
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- Confirm the app is connected to the project and database you inspected; development, staging, and production configurations can differ.
- Compare the deployed rules with your local source and confirm the intended changes were published.
- For Firestore, locate the matching document path and follow the applicable
allowcondition. - For Realtime Database, trace the requested node through its parent and child rules, accounting for grants that cascade from shallower locations.
Match the rule to the operation, path, and identity
Rules may permit a read but reject a write, or permit access to one path while denying another. Check the exact operation and resource rather than treating a successful request elsewhere in the app as proof that this request should pass.
Then inspect what identity the request actually carries. Firebase Authentication establishes who the user is; Security Rules decide whether that identity may access the requested data. Being signed in does not automatically grant access. Firestore rules can use request.auth, while Realtime Database rules can compare a path value with auth.uid. If a rule depends on a UID or claims, verify that the request runs after authentication is ready and that the values match what the rule expects.
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Firestore’s REST API defines PERMISSION_DENIED as “The user is not authorized to make this request.” That describes the outcome, not the particular failed condition.
Reproduce the failing request in Firebase’s rules tools
Use the Rules Playground or Simulator for a quick check, or the Local Emulator Suite for deeper testing. Set the simulated product, operation, path, and authentication state to match the React Native request. A test with a different UID, missing authentication, or a different path may produce a misleading result. Firebase describes these testing options in its Security Rules simulator documentation.
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- Copy the exact resource path and identify whether the app is performing a read or write.
- Choose the corresponding Firebase product and database ruleset.
- Set the test identity to the same state as the app request: unauthenticated or authenticated with the relevant UID and claims.
- Run the simulation, inspect which condition allows or rejects the request, and adjust the rule only if the denied access conflicts with your intended policy.
- Test the corrected rule against allowed and disallowed cases before deploying it.
Confirm whether the request uses client rules or server authorization
Do not assume every Firebase-related request is governed by mobile or web Security Rules. Firestore server client libraries bypass Firebase Security Rules and use Google Application Default Credentials. REST or RPC calls and other server-side flows can require IAM authorization instead. Confirm which SDK or API makes the request and what credentials it uses; otherwise, you may troubleshoot client rules that are not involved. Firebase explains the distinction in its Firestore rules and authentication documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Avoid “fixing” the error by opening access broadly
Unrestricted reads or writes can make the error disappear while exposing data or allowing unwanted changes. Preserve the intended access policy: grant access only under conditions appropriate to the user and resource, then test both permitted and forbidden requests. Firebase warns against overly broad rules in its Security Rules getting-started guide.
Quick Recap
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Use this checklist to narrow down the cause
- Product: Is the call to Firestore, Realtime Database, or another service?
- Operation and path: Is it a read or write, and what exact document, collection, or database node is involved?
- Rules: Are you looking at the deployed rules for the correct project and database?
- Identity: Is the request authenticated when it runs, and does its UID or claims satisfy the rule?
- Test: Does the Playground, Simulator, or Emulator test use the same path, operation, and identity as the app?
- API type: Is the request made by a mobile client SDK, a server library, or REST/RPC code?
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