ESP32 NVS Erase Key Does Not Clear Data

In this tutorial, you'll learn about ESP32 NVS Erase Key Does Not Clear Data. We cover key concepts, practical examples, and best practices.

The Problem

ESP32 NVS erase_key() returns success but the key still exists when read.

Quick Fix

Wrong

nvs_erase_key(handle, "temp");  // Don't forget to commit

nvs_get_i32(handle, 'temp', &val) still returns old value.

Right

esp_err_t err = nvs_erase_key(handle, "temp");
if (err == ESP_OK) {
  nvs_commit(handle);  // Must commit erase
  Serial.println("Key erased");
} else if (err == ESP_ERR_NVS_NOT_FOUND) {
  Serial.println("Key did not exist");
} else {
  Serial.printf("Erase failed: %s\n", esp_err_to_name(err));
}
// Verify
err = nvs_get_i32(handle, "temp", &val);
if (err == ESP_ERR_NVS_NOT_FOUND) {
  Serial.println("Verified: key deleted");
}

Key erased
Verified: key deleted

Prevention

Call nvs_commit() after nvs_erase_key(). Check return code for ESP_ERR_NVS_NOT_FOUND. Verify deletion by attempting to read the key. Erase all keys in a namespace with nvs_erase_all(handle).

DodaTech engineers apply these same patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro for production IoT reliability.

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