Jison vs PEG.js

Side-by-side — pricing, strengths, tradeoffs, and fit.

Jison

Friendly JavaScript parser generator inspired by Bison and Yacc.

PEG.js

Simple parser generator for JavaScript with fast parsers and excellent error reporting.

At a glance

Open SourceFree Tier
◌ Declining·From $0
Open SourceFree Tier
◌ Declining·From $0

Overview

One-liner

Friendly JavaScript parser generator inspired by Bison and Yacc.

One-liner

Simple parser generator for JavaScript with fast parsers and excellent error reporting.

Maturity

Declining

Maturity

Declining

Open source

✓ Yes

Open source

✓ Yes

Pricing

Free tier

✓ Available

Open source — free to use

Free tier

✓ Available

Open source — free to use

Starts at

$0

Starts at

$0

Model

Flat rate

Model

Flat rate

Enterprise

✕ None

Enterprise

✕ None

Best for

✓ Best for

Developers working on projects requiring custom parsing logic in JavaScript
Teams building DSLs and need a robust parser generator tool
Individual developers who prefer open-source solutions for text processing tasks

✓ Best for

JavaScript developers who need to parse complex grammars efficiently and with clear error messages.
Projects requiring custom syntax parsing, such as DSLs or configuration files.

Not ideal for

✕ Not for

Projects that require real-time parsing with extremely low latency
Applications where the overhead of setting up an additional library is not acceptable

✕ Not for

Scenarios where a full-fledged parser generator like ANTLR is required due to its more extensive feature set.
Real-time data processing tasks that require extremely low latency and high throughput.

Strengths

↑ Strengths

Generates JavaScript parsers from BNF grammars
Supports both LALR(1) and SLR(1) parsing algorithms
Easy to integrate into existing projects as a library

↑ Strengths

Generates fast parsers from PEG grammars
Provides excellent error reporting for easier debugging
Simple and easy to use API
Supports JavaScript ES6+ features

Weaknesses

↓ Weaknesses

Steep learning curve for new users
Limited documentation and examples
Performance overhead for complex grammars
Limited community support and activity

↓ Weaknesses

Limited integrations with other ecosystems
Complex setup for non-trivial grammars
Performance issues with large input sizes
Documentation lacks depth for advanced use cases
Full Jison profile →Full PEG.js profile →