Process Text Files

Spell check is a helpful feature that users like to see on websites. We’ll develop a spell-check and correction feature for the text in our application. When we upload a text file, it’s automatically detected and processed before being saved to the database.

Node.js does not have a native method to perform spell checks on text or files. So, we’ll develop our own algorithm by performing these three steps:

• Read the text file line by line.
• Get similar words for each misspelled word.
• Choose the most similar word as a correction

Read Files

We use the built-in fs module to read the file, and a second built-in module to read it line by line. In reality, the performance doesn’t differ much between reading a file all at once and reading it line by line, but the option of reading line by line helps us avoid keeping a large amount of data in the memory.

A line-by-line reading of a a file can be implemented as follows: