Unable to install express-graphql

Question

I'm trying to install express-graphql but getting this error. Please, help!

npm install --save express-graphql 
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/graphql
npm ERR!   graphql@"^16.2.0" from the root project 
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer graphql@"^14.7.0 || ^15.3.0" from [email protected]
npm ERR! node_modules/express-graphql
npm ERR!   express-graphql@"*" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

Elaelaborate

Same error. Did you find a solution? – Forage

I am facing a similar problem. – Levine

Answer 1

Delete the full initialized project then run the following:

npm init -y
npm install express express-graphql
npm install graphql

You should install express-graphql before graphql.

Muskellunge

Answer 2

Uninstall graphql module if it's present. Then install both of them with one command:

npm install graphql express-graphql

Thumbtack

Answer 3

I generated my app using:

npx express-generator <projectName>

and to solve the issue, I just did:

npm un express graphql

which where modules that I had already installed and then ran:

npm i express-graphql graphql express 

in that order worked for me.

Shriner

Answer 4

1. Delete package.json, package-lock.json, & node_modules.
2. Initialize npm again.
3. Now, install express-graphql with npm at first (install before any other package in the app).

These steps solve my problem.

Johnson

Answer 5

Can you try deleting package-lock.json? It may help as per the github issue.

Porphyrin

Answer 6

As stated in the other answers, first remove graphql via:

npm remove graphql

Now install express-graphql with this command:

npm install express-graphql

It works for me.

Luo

Answer 7

Install in this order:

npm install express-graphql graphql express

Sarajane

Answer 8

'express-graphql' is DEPRECTATED in favor of graphql-http!

Million

Answer 9

Install express-graphql before installing express.

Attainable

? The OP just failed to install express-graphql, so how he will install before something else ? – Halation

Answer 10

npm install express-graphql --save --force

works for me.

Additive

Answer 11

I deleted package-lock.json and ran

npm install express-graphql graphql --save

It worked for me.

Emigrant

Answer 12

I installed graphql then express-graphql, then npm i express --force

Askew

Answer 13

If you try to install express-graphql after graphql, it creates the conflict and that errors you see in the console. According to GraphQL spec, you should use the following modules installation order:

npm install express express-graphql graphql --save

To fix the issues, you should:

1. Remove graphql
2. Install express-graphql
3. Install graphql

Sludge

Answer 14

STEP 1: Delete package.json, package-lock.json, node_modules and start again.

STEP 2: npm install express express-graphql graphql --save

Apparently installing packages in that order works. Command is copied from GraphQL docs. https://graphql.org/graphql-js/running-an-express-graphql-server/

Noxious

Answer 15

install express-graphql with yarn

1. install yarn npm install --global yarn
2. install dependencieyarn add express-graphql
3. be happy!

Hoxsie