0 min7 giu 2026

How to translate JSON files for web applications and SaaS (complete guide)

Translating JSON files is a fundamental part of modern application development, especially when working with localization (i18n) systems for websites, mobile apps, and SaaS platforms.

In this guide, we will see how to correctly translate JSON files, avoiding common mistakes and keeping the structure intact.

What is a localization JSON file

A JSON file is often used to manage texts and translations in applications. Each key represents a piece of UI text.

Example:

{
  "home.title": "Welcome",
  "home.subtitle": "Discover the platform"
}

When translating an app, only the values should be changed, while the keys must remain identical.

Problems with manual translation

Translating JSON files manually can cause several issues:

  • accidental modification of keys
  • loss of file structure
  • errors in placeholders (e.g. {{name}}, %s)
  • inconsistency across languages
  • difficulty scaling to multiple languages

These issues become even more evident in SaaS projects and multi-language applications.

How to correctly translate JSON files

There are several approaches:

1. Manual translation

Simple method but not scalable and prone to errors.

2. Custom scripts

Using scripts to iterate through JSON and translate values, but it requires maintenance.

3. AI translation tools for JSON

The most modern solution is to use AI-based tools that:

  • keep the JSON structure intact
  • preserve original keys
  • recognize variables and placeholders
  • translate into multiple languages simultaneously

Why use AI for localization

Artificial intelligence allows you to:

  • drastically reduce translation time
  • improve text consistency
  • easily manage large localization files
  • scale from 1 to 60+ languages without manual work

This is especially useful for developers and SaaS teams working in multi-language environments.

FileTranslator: automatic JSON translation

FileTranslator is a tool designed to simplify JSON and i18n file translation.

It allows you to:

  • automatically translate JSON files using AI
  • keep the original structure intact
  • preserve variables and placeholders
  • export production-ready files
  • support over 60 languages

Conclusion

Manually translating JSON files is no longer sustainable in modern projects.

Using AI tools speeds up the localization process and reduces errors, improving software scalability.

If you work with multi-language applications, automating JSON translation is now almost a necessity.