TS2551: Property does not exist. Did you mean TypeScript Origin: On your device OSI layer 7 · Application Last updated 5 Nov 2026

TypeScript: error TS2551: Property 'lenght' does not exist on type 'string'. Did you mean 'length'?

A property name is misspelled (TypeScript suggests the closest valid one).

Exact message you may see error TS2551: Property 'lenght' does not exist on type 'string'. Did you mean 'length'?TS2551: Property does not exist on type. Did you meanProperty 'x' does not exist on type 'Y'. Did you mean 'z'? ts(2551)error TS2551
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Seen on: TypeScript

Meaning

Fix the typo, or if the property truly exists at runtime, declare it in the type/interface or augment the library types. For dynamic keys use Record<string, T> or index signatures.

Common causes

  • Typo in a property/method name
  • Property from a different type/version of a library
  • Missing interface property
  • Using .length on number etc.
  • JS object extended at runtime

⚡ Quick fix

  1. Use the suggested name
  2. Add the property to the interface/type
  3. Use an index signature for dynamic keys

Detailed fix by platform

TypeScript

  1. interface User { name: string; email?: string }

How to diagnose

  1. Name — Typo?
  2. Type — Declares it?
  3. Dynamic — Index signature?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: On your device. Errors that are often confused with or caused by this one (click to open):

Cannot find module './App.vue' or its corresponding type declarations — TypeScript: error TS2307: Cannot find module './App.vue' or its corresponding type declarations. (Vue)Cannot find module '.…TS1005: ';' expected / ',' expected (syntax error) — TypeScript: error TS1005: ';' expected. (TypeScript)TS1005: ';' expected …TS1128: Declaration or statement expected — TypeScript: error TS1128: Declaration or statement expected. (TypeScript)TS1128: Declaration o…TS1192: Module has no default export — TypeScript: error TS1192: Module '"./utils"' has no default export. (TypeScript)TS1192: Module has no…TS1208: File cannot be compiled under '--isolatedModules' because it is considered a global script file — TypeScript: error TS1208: 'index.ts' cannot be compiled under '--isolatedModules' because it is considered a global script file. Add an import, export, or an empty 'export {}' statement (TypeScript)TS1208: File cannot b…TS1259: Module can only be default-imported using the 'esModuleInterop' flag — TypeScript: error TS1259: Module '"express"' can only be default-imported using the 'esModuleInterop' flag (TypeScript)TS1259: Module can on…TS2339 — TS2339: Property 'x' does not exist on type 'Y'. (Node.js)TS2339TS2353: Object literal may only specify known properties — TypeScript: error TS2353: Object literal may only specify known properties, and 'nmae' does not exist in type 'User' (TypeScript)TS2353: Object litera…TS2551: P…

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