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A command-line JSON viewer for efficient data exploration and debugging.

Terminal ToolsDeveloper ToolsData & Databases
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Tracked since2026
0 reviews tracked

The Bottom Line

Entry price

Free, no paid tier

Biggest pro

Enhances readability of JSON data with pretty printing and syntax highlighting.

Biggest con

Limited to command-line interface, no GUI option.

TL;DR - jless

  • Command-line JSON viewer with pretty printing and syntax highlighting.
  • Offers Vim-inspired commands for efficient navigation and exploration.
  • Supports full-text regular expression search for quick data retrieval.
Pricing: Free forever
Best for: Individuals & startups

What is jless?

Editorial review
jless is a powerful command-line tool designed for reading, exploring, and searching through JSON data. It automatically pretty prints and syntax highlights JSON, making complex data structures easy to understand at a glance. Users can expand and collapse objects and arrays to navigate both high-level and granular details of a JSON document, which is particularly useful for debugging API responses or inspecting request payloads. Inspired by Vim, jless offers a comprehensive suite of commands for seamless data exploration. Its full-text regular-expression based search allows users to quickly locate specific data within long string values or jump between occurrences of the same object key. This tool is ideal for developers, QA engineers, and anyone who frequently works with JSON data in a command-line environment on macOS or Linux.

Available on: macOS, Linux

how we evaluateSourcejless.io ↗

Pros & Cons

Pros

  • Enhances readability of JSON data with pretty printing and syntax highlighting.
  • Efficient navigation and exploration with Vim-inspired commands.
  • Powerful search capabilities using regular expressions.
  • Useful for debugging APIs and inspecting request payloads.
  • Easy installation via various package managers on supported OS.

Cons

  • Limited to command-line interface, no GUI option.
  • Currently only supports macOS and Linux.
  • Requires Rust toolchain for installation from source.

Preview

Key Features

Command-line interfacePretty print JSONSyntax highlightingExpand and collapse Objects and ArraysVim-inspired navigation commandsFull-text regular-expression based searchSearch within long string valuesJump between values for the same Object key

Pricing Plans

Pricing checked Aug 8, 2026

jless

Free

  • Pretty print JSON
  • Syntax highlighting
  • Expand and collapse Objects and Arrays
  • Vim-inspired commands
  • Full text regular-expression based search
Calculate your costView full pricing

Is jless worth the price?

100/100

The pricing for jless is exceptionally generous as it is completely free.

This makes it an outstanding value for anyone needing a robust command-line JSON viewer without any financial commitment. It's best for individual developers, system administrators, and anyone working with JSON data who prefers a powerful, free tool.

Hidden Costs & Gotchas

No hidden costs; it's genuinely free.

How jless Compares to Competitors

Compared to other command-line JSON viewers like `jq` or `less` combined with `pygmentize`, jless offers a more interactive and feature-rich experience (e.g., expand/collapse, Vim commands) all for free. While `jq` is also free and powerful for processing, jless excels in interactive viewing. There are no paid competitors offering similar interactive CLI JSON viewing features.

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jless FAQ

How does jless improve the readability of JSON data?

jless automatically pretty prints and syntax highlights JSON, which makes complex data structures much easier to understand. It allows users to expand and collapse objects and arrays for focused navigation.

What kind of user is jless best suited for?

jless is ideal for developers, QA engineers, and anyone who frequently interacts with JSON data within a command-line environment. It is particularly useful for debugging API responses or inspecting request payloads.

How is jless priced?

jless is free to use, meaning there is no paid plan required to access its features. Users can install and utilize the tool without any cost.

Which operating systems does jless support?

jless currently supports macOS and Linux operating systems. It can be installed via various package managers on these supported platforms.

Can jless help with debugging API responses?

Yes, jless is particularly useful for debugging API responses and inspecting request payloads. Its ability to pretty print, syntax highlight, and allow navigation through JSON makes it efficient for this task.

What are the main limitations of jless?

jless is limited to a command-line interface and does not offer a graphical user interface option. Additionally, it currently only supports macOS and Linux, and installing from source requires a Rust toolchain.

How does jless facilitate searching within JSON documents?

jless includes powerful full-text regular-expression based search capabilities. This allows users to quickly locate specific data within long string values or jump between occurrences of the same object key.

Source: jless.io

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